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UNCLASSIFIED 
AD 265 072 
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Inf. the 
ARMED SERVICES TECHNICAL INPORMAnON ACENCY 
ARUXCTON HALL STATION 
ARLINGTON 12, VIRGINIA 
UNCLASSIFIED
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MEMORANDUM REPORT 
AUGUST 1961 
NO. 
Iill 
1362 
SATELLITE-INDUCED IONIZATION 
OBSERVED WITH THE DOPLOC SYSTEM 
ARPA Satellite Fence Series 
Harold T. Lootens 
*oV 
Report No. 23 In the Series 
Department of the Army Project No. 503-06-011 
Ordnance Management Structure Code No. 5210.21.14303 
BALLISTIC RESEARCH LABORATORIES 
?™?™?Ba,,Ba!aele»«MS^^ 
"■ii'ii" 'iriVn iV;.:^-^.-^.^^^ 
ABERDEEN PROVING GROUND, MARYLAND 
■:
ASTIA AVAILABILITY NOTICE 
Qualified requestors may obtain copies of this report from ASTIA, 
This report will appear in a journal 
and will be available to the public. 
.■:,■ / ■■ ■■■<.:. -■"
BALLISTIC RESEARCH LABORATORIES 
MEMORANDUM REPORT NO. I562 
AUGUST I96I 
SATELLITE-INDUCED IONIZATION 
OBSERVED WITH THE DOPLOC SYSTEM 
ARPA Satellite Fence Series 
Harold T. Lootens 
Ballistic Measurements Laboratory 
Report No. 25 in the Series 
Department of the Army Project No. 5O5-O6-OII 
Ordnance Management Structure Code No. 5210,21.1^503 
ABERDEEN PROVING GROUND, MARYLAND
BALLISTIC RESEARCH LABORATORIES 
MEMORANDUM REPORT NO. I362 
HTLootens/bjk 
Aberdeen Proving Ground, Md. 
August I96I 
SATELLITE-INDUCED IONIZATION 
OBSERVED WITH THE DOPLOC SYSTEM 
ABSTRACT 
This report presents a series of constant frequency Doppler 
reflections obtained with the DOPLOC "dark" satellite tracking system. 
These reflections, termed "flats", are associated with satellite 
Doppler reflections and are of the type that would be received from 
a large, low velocity, ionized cloud. A tabulation of flats recorded 
at times other than satellite pass times is also given and a dis-cussion 
of meteor-induced ionization is included. 
. ,.,■.:,,..: v.:;;;..,..:- —^.^.v.-;,.
XABIE ÜF CONTENTS 
PAGE 
I. HfPRODUCTION 9 
II. DOPLOC SYSTEM DESCRIPTION 11 
III. DATA FORMAT 12 
A. Doppler Recording 12 
B. Signal Strength ..... 12 
C. Multiple Antenna Records IJ 
IV. EXPERIMENTAL RESULTS 1^ 
A. "Flats" Associated with Satellite Passage 1^ 
B. "Flats" During Random Periods 16 
C. Meteor-Induced lonization kh 
V. CONCLUSIONS . . . , k3 
VI. REFERENCES , 1^ 
VII. BIBLIOGRAPHY ,...., Vf 
APPENDIX I. 3RL-D0PL0C REPORTS 1^9 
, s
LIST OF FIGURES 
Figure No. 
1. Basic Interim DOPLOC System 
2. AJRPA-BRL DOPLOC Doppler Record 
3. ARPA-BRL DOPLOC Doppler Record 
k. ARPA-BRL DOPLOC Doppler Record 
5. ARPA-BRL DOPLOC Doppler Record 
6. ARPA-BRL DOPLOC Doppler Record 
7. ARPA-BRL DOPLOC Doppler Record 
8. ARPA-BRL DOPLOC Doppler Record 
9. ARPA-BRL DOPLOC Doppler Record 
10. ARPA-BRL DOPLOC Doppler Record 
11. ARPA-BRL DOPLOC Doppler Record 
12. ARPA-BRL DOPLOC Doppler Record 
15. ARPA-BRL DOPLOC Doppler Record 
Ik, ARPA-BRL DOPLOC Doppler Record 
15. ARPA-BRL DOPLOC Doppler Record 
16. ARPA-BRL DOPLOC Doppler Record 
17. ARPA-BRL DOPLOC Doppler Record 
18. ARPA-BRL DOPLOC Doppler Record 
19. ARPA-BRL DOPLOC Doppler Record 
20. Flats and Satellite Passes, 22 
21. Flats and Satellite Passes, 15 
22. Flats and Satellite Passes, 15 
25. Flats and Satellite Passes, 12 
2k, Flats and Satellite Passes, 31 
25, Flats and Satellite Passes, 6 • 
26, ARPA-BRL DOPLOC Doppler Record 
27, XRPA-BRL DOPLOC Doppler Record 
28, ARPA-BRL DOPLOC Doppler Record 
29, ARPA-BRL DOPLOC Doppler Record 
50. ARPA-BRL DOPLOC Doppler Record 
31, ARPA-BRL DOPLOC Doppler Record 
32. ARPA-BRL DOPLOC Doppler Record 
35. ARPA-BRL DOPLOC Doppler Record 
of 59 Kappa, Rev. 183 
of 58 Delta 2, Rev. 8386 
of 58 Delta 2, Rev. 66k5 
of 58 Delta 2, Rev. 8683 
of 58 Delta 2, Rev. 8719 
of 58 Delta 2, Rev. 9009 
of 58 Delta 2, Rev. 9^72 
of 58 Delta 2, Rev. 9503 
of 58 Delta 2, Rev. 9716 
of 58 Delta 2, Rev. 9826 
of 58 Delta 2, Rev. 9832 
of 58 Delta 2, Rev. 9937 
of 58 Delta 2, Rev. 10001 
of 59 Lambda, Rev. 96 
of 59 Lambda, Rev, 1516 
of 60 Epsilon 2, Rev. iVf 
of 60 Epsilon 2, Rev. 303 
of 60 Epsilon 6, Rev. 301 
- 26 July 59 
- 17 Sept 59 
- 21 Dec 59 
- l6 Jan 60 
Mar - 6 Apr 60 
• 10 Jun 60 
of 59 Epsilon 1, Rev. 532 
of 58 Delta 2, Rev. 873I1 
of 58 Delta 2, Rev. 99^3 
of 58 Delta 2, Rev. 9959 
of 58 Delta 2, Rev. 10Ö07 
of 58 Delta 2, Rev. 10023 
of 60 Epsilon 2, Rev. 356 
of 60 Epsilon 1, Rev. 386
I. INTRODUCTION 
During the period 1 January 1959 to 1 July i960, the Bailiatlc 
Research Laboratories, under funding from the Advanced Research 
Projects Agency (ARPA Order 8-58), operated a three-station, reflection 
Doppler satellite tracking system, extending across the southrcentral 
United States from Tennessee to New Mexico. This system, known as 
DOPLOC, (DOppler Phase IflCk), provided a means of detecting and tracking 
radio-silent, or "dark" satellites. Detailed reports outlining the 
planning, implementation, operation and administration of the DOPLOC 
system have been published1'2'5^ so no further space will be devoted 
to it here. 
A transmitting station was located at Fort Sill, Oklahoma and 
receiving stations were located at White Sands Missile Range, New 
Mexico and at Forrest City, Arkansas. The three stations were initially 
manned on a twenty-four hour, seven-day-per-week basis, as a part of the 
nation-wide satellite surveillance net. Following permission from ARPA 
to discontinue routine twenty-four hour operation, the White Sands 
station was deactivated and a nominal eight-hour work day was adopted 
at the Forrest City and Fort Sill stations on 1 October I959. 
The primary objective of the DOPLOC system was to detect and track 
non-transmitting (dark) satellites but the flexible schedule under which 
the field stations operated also provided considerable data from known 
satellites. Unidentified Flying Objects and meteors. In addition, the 
system provided much useful data relative to the satellite-induced 
ionization theory. 
It is the purpose of this report to present data on this highly 
controversial subject of satellite-induced ionized trails or clouds. 
Several workers in the field, notably Kraus et al. at Ohio State 
University 5' '7, and Liszka et al. at the Kiruna Geophysical Observatory 
in Sweden , have reported the existence of satellite-induced ion trails, 
Many othem in this field doubt the existence of such trails or are 
dubious about the reported magnitude and persistence of the trails. 
.
^ed lonlMtloa theory, hut rather vm preeent reaction date 
oht-uned fro. . ^e, ^ „^^ ^^ ^^ 
tjpe presented In tht3 report are de« „<.-., . - 
..* ,,,,. äeflnltely not from satellites, since 
=o Tf'*"**- "" the fMt ttot^"lotion, occur a, a 
patent »oppier fre^ncy at the hiss .re^enc. level Inzestes th!t 
ZZT^ ™ ""^" ~-^«— - the .ronnd 
10
II. DOPLOC SYSTEM DESCRIPTION 
The DOPIXXJ system consisted of a 50-kw continuous wave, 108 nc 
transmitter located at Fort SlU, Oklahoma, which fed one of three high-gain 
antennas. These high-gain antennas emitted narrow, fan-shaped 
beams, one directed 20 degrees ahove the northern horizon, one directed 
vertically and one directed 20 degrees above the southern horizon 
(see Figure l). 
The signal reflected from a satellite passing through the trans-mitter 
beam was received at one or both of the receiving stations. 
Each receiving station had three high-gain antennas oriented to "see" 
the space volume illuminated by the transmitter. The reflected signal 
was fed through a receiver and a bank of fixed audio frequency filters, 
known as the Automatic Lock-On (ALO), to a narrow-band, phase-locked 
tracking filter. The tracking filter then tracked the Doppler signal 
as the satellite passed through the antenna beam. A satellite which 
crossed the base line joining the transmitter and receiver traversed 
each of the three fan-shaped antenna beams. This resulted in three 
separate Doppler records, one for each of the three antennas, separated 
In time by 5O-60 seconds. The length of the Doppler records varied, 
averaging about 7 seconds in the center antenna and 15-25 seconds In 
the north and south antennas. Data outputs were Doppler frequency as 
a function of time in a digital and punched tape format, as well as 
strip chart recordings of Doppler analog frequency and signal strength 
with respect to time. A complete and detailed description of the 
DOPLOC instrumentation system is available", so no further discussion 
of it will be presented here. 
When the DOPLOC system assumed twenty-four,hour operational status 
in January 1959^ the transmitter at Fort Sill served as the illuminator 
for both receiving stations. When the White Sands station was deacti-vated 
in the fall of 1959^ the antennas at Fort Sill and Forrest City 
were re-oriented in azimuth to produce a greater overlapping of the 
beams and better coverage. All data presented in this report were 
recorded at the Forrest City station. 
1-1
III. DATA FOBMAT 
A, Doppler Recording 
The typical form in which DOPLOC data are recorded is shown in 
Figure 2. The upper portion of the chart is an analog record of 
tracking filter output frequency. The short, evenly spaced marks 
indicate the sucessive frequencies at which the tracking filter is 
set while the system is in the search mode. Figure 2 shows the 
tracking filter output when the ALO Is scanning a 12 kc range. The 
AIX) can also he adjusted to scan a 4 kc or 2 kc range. 
The transition from step scanning to continuous phase-locked 
tracking is shown in Figure 2 at ITU:58 Z time. Concurrently, the 
digital counter and printer is started and the period of 1000 cycles 
of the Doppler signal is printed at one second intervals on paper tape. 
The Doppler period count for Revolution 185 of 59 Kappa, corresponding 
to the Doppler frequency analog record, is shown at the top left of 
Figure 2. The right five digits represent the period count, while 
the left iix digits represent Universal Time in hours, minutes and 
seconds. 
B. Signal Strength 
The lower part of the chart in Figure 2 is a record of the AGO 
voltage from the tracking filter. While in the search mode, the AGO 
is shorted, producing the clean, straight line at 2 mm deflection. 
When a signal is detected, the AGO voltage first decreases due to'an 
initial threshold voltage of opposite polarity existing on the AGO 
line. Then, as the signal amplitude increases, the AGO voltage in-creases 
as shown by the scale calibration. The chart is calibrated 
in received signal input power (in dbw) at the receiver input terminals 
and also in relative signal in terms of the signal-to-noise ratio at 
the receiver output, i.e. in db below 1:1 S/N at the receiver output. 
12
C. Multiple Antenna Records 
This one pass of 59 Kappa has been treated In considerable detail ' 
to explain the nature, quality and quantity of DOPLOC data and, con-sequently, 
the discussion has been devoted to data received by the 
vertically directed center antenna. In the next section of this report, 
examples of satellite passes recorded by more than one antenna win be 
presented. 
During the 18-month operation of the DOPLOC system, 111 satellite 
reflections were received, resulting from observations of 89 individual 
satellite passes (8 passes were received by two antennas and 7 passes 
by all three antennas). Of these 111 reflections, 67 were received 
by the center antenna alone or by the center antenna in combination with 
the north or south antenna. 
13
IV. EXPERIMENTAL RESUIITS 
A. "Flats" Associated with Satellite Passage 
Approximately 25^ of the satellite passes recorded by the DOPLOC 
center antenna (17 of 6?) revealed a constant frequency reflection, 
either preceding or following the Doppler signal reflected from the 
satellite. These constant frequency reflections, termed "flats" 
appear on the analog records as a horizontal line, close to or equal 
to the bias frequency of 7 kc^ indicating zero velocity. These 
Doppler frequency flats, which indicate an apparent zero velocity target^ 
could be caused either by a large ionized mass moving through the 
antenna beam at a very low velocity, or by a stationary ionized mass 
having a lifetime equal to the duration of the observed signal. On 9 
of the records the flats produced a stronger signal level than the 
corresponding satellite reflection. The average signal strength of 
the flats (-170 dbw) is slightly stronger than the average signal strength 
of the satellites observed (-I71 dbw). Reproductions of DOPLOC satellite 
reflections showing evidence of flats are presented in Figures 3-I9 and 
a tabulation of the data is given in Table I. 
Of the 17 satellite records which reveal flats, 12 are reflections 
{from 58 Delta 2 (Sputnik III). The other passes displaying flats are 
records of 59 Lambda (Discoverer VIII), 60 Epsilon 2 (Sputnik IV rocket) 
and 60 Epsilon 6 (Sputnik IV fragment). About 65^ of the flats occur 
after (or before and after), the satellite has passed through the antenna 
beam, and all of the flats appear in the center antenna. Perhaps a brief 
explanation of the antenna switching procedure is desirable at this 
point, to indicate which antenna was in use when the flats were recorded. 
In Figures 13, Ik and 17, an abrupt shift in the ALO frequency scan 
is visible. This shift represents the transfer of power from one antenna 
to the next. For example, in Figure 15, the ALO scans the 2-5 kc range 
as the satellite approaches and is tracked through the south antenna. 
Following loss of signal by the south antenna, power is switched to the 
center antenna and the AH) scans the 6-9 kc range. This transition is 
shown at 0641:46 Z time. This scan is continued until the satellite has 
traversed the center beam and then a switch is made to the north antenna 
. 
Ih
TABLE I - DOPLOC SATELLITE REFLECTIONS POSSESSING FLATS 
Satellite Rev. 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
58 Delta 2 
59 Lambda 
59 Lambda 
60 Epsilon 2 
60 Epsilon 2 
60 Epsilon 6 
Average 
8386 
86if3 
8683 
8719 
9009 
9^72 
9503 
9716 
9826 
9832 
9937 
10001 
96 
1516 
147 
303 
501 
Altitude 
Miles 
172 
156 
1*13 
186 
15^ 
130 
150 
285 
189 
110 
158 
12k 
12k 
137 
2k0 
213 
iQk 
•Peak Signal in dbw 
Satellite Flat 
Flat Before/After 
Satellite Pass 
-I67 -174 Before and After 
-170 .172 After 
-175 -I65 Before 
-171 -172 After 
-175 -170 Before 
-172 -163 After 
-170 .175 After 
-176 -I'jk Before and After 
-176 -172 Before 
-171 -159 After 
-I62 -168 Before and After 
-169 .175 Before 
-I69 .i'jk Before 
-I67 -174 After 
-175 -16k After 
-175 -174 After 
J^Z5 ^173 After 
-171 -170 
15
and a 10-15 kc scan range at 06l»3:12 Z time. The chart recorder pen 
deflection was adjusted at 06'I'J:00 Z time and the satellite was subse-quently 
tracked through the north antenna. This completes the antenna 
switching and recording cycle for this pass. Antenna switching was 
performed simultaneously at the transmitter and receiver and synchronized 
"by teletype communication. In Figure 12, similar switching was performed 
as indicated at l3l2:5J* Z time, and the pen deflection subsequently 
adjusted to center the trace in the upper portion of the chart. It is 
probable that the flats observed in Figures 12, IJ, and 1? would have 
been longer in duration if the recording had not been interrupted by 
antenna switching. 
B. Flats During Random Periods 
In an attempt to determine if a correlation actually exists between 
satellite passage and the occurrence of flats, it was decided to chart 
all of the fiats and satellite passes which occurred during several arbi-trarily 
selected periods between July 1959 and July i960. The resulting 
charts are presented in Figures 20-25 and an explanation of them follows. 
The original records were recorded on ^wo-channel Sanborn chart 
paper. Type 651-52. During the operation of the DOPLOC system, over 300 
complete rolls of this paper were utilized, amounting to more than 6000 
hours of recordings. The six one-week periods chosen for this random 
examination are a representative sample of the total amount of data recorded. 
The first DOPLOC satellite reflection was received in August 1959, so the 
initial period to be studied was selected in July 1959, Just prior to the 
first reflection. Five additional samples were chosen at approximately 1-2 
month intervals, covering the time until the DOPLOC system was deacti-vated 
in July i960. Each period examined consisted of.five consecutive 
days, with the exception of the charts in Figures 22 and 2k. The days that 
were omitted on these charts (19-20 Dec 59 and 2-5 Apr 60) fell on Saturday 
and Sunday, and the station was operating only on a five-day week at that 
time. 
16
Each chart represents five complete days, and each day is divided 
into four segments of six hours each, with the horizontal scale reading 
from left to right in Universal Time. The short, vertical marks rep-resent 
flats, with no regard for their duration. The flats vary in 
length from several seconds to a minute or more, but each one is rep-resented 
by a single mark regardless of duration. A tabulation of all 
flats, including duration and signal strength values, is given in Tables 
II - VII. 
The long, vertical marks represent satellites which were predicted 
for the DOPIÖC system during the period. Each is identified with the 
year of launch and the Greek letter assigned by Space Track Control 
Center. In addition, the altitude of each pass as it crossed the base 
line is given. The periods labeled "NO MTA" represent periods when the 
station was not operating; at all other times the station was manned and 
continuous recordings were made. Several of the satellite passes are 
markedt . Here, the passage of the satellite through the antenna beam 
was recorded and reproductions of these Doppler frequency observations 
are presented in Figures 6, 15, 26-53. 
Attention is called to the small number and random distribution of the 
flats in Figures 20 and 21. There is no correlation* with satellite passage 
in Figure 20 and only slight correlation in Figures 21, 2k and 25. In 
Figures 22 and 25, however, a number of excellent correlations are visible 
in connection with 58 Delta 2, perhaps because of the size and configuration 
of this satellite. Table VIII presents a summary of the number of passes 
in each period, together with the number of correlations and their iden-tification. 
In Figures 22-25, the occurrence frequency profile of the flats is 
radically different. Instead of a small number of flats randomly distributed, 
these charts show an increase in the number of flats by a factor of 3 or k, 
* ?°rr^lation denotes a minimum of two flats occurring in the period from 
10 minutes before pass time until 20 minutes after pass time. These 
passes are underlined in Figures 20-25. 
17
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TABLE'VIII - SATELLITE PASSES AND CORRELATED FIATS 
Number of Satellite Number of Identification 
Fls No. ; Period Examined Passes in Period Correlations» of Correlations 
20 22-26 Jul 59 11 0 
21 15-17 Sep 59 15 5 58 Delta 2 (2) 
59 Epsilon 1 (5 
22 15-21 Dec 59 6 5 58 Delta 2 (5) 
25 12-16 Jan 60 6 k 58 Delta 2 (k) 
2k 51 Mar-6 Apr 60 6 2 58 Delta 2 (l), 
60 Beta 1 (l) 
25 6-10 Jun 60 10 
• - 
1 60 Epsilon 2 (1) 
* Correlation denotes a minimum of two flats occurring in the period from 10 
minutes before pass time, until 20 minutes after pass time. 
ho
and a distribution characterized by email, compact groups separated by 
long periods of little or no activity. Such a distribution might Indicate 
that these flats were caused by a distinct event, ouch as the movement of 
a satellite or meteor shower. 
To examine the relationship between satellite altitude and flats, 
a tabulation was made of all flats occurring in a 50-minute period* In 
the vicinity of each of the underlined satellite passes in Figures 20-25. 
These data are presented in Table DC. 
Regarding the effect of satellite altitude on the formation of flats, 
It is noted that of the 6? satellite reflections recorded by the DOPLOC 
center antenna, 1? (or 2556) show evidence of flats near the satellite 
pass time (see Table l). These 1? satellite passes have an average altitude 
of l8h miles. It cannot be concluded from these data, however, that flats 
are more frequently associated with the lower altitude satellites, since 
the average altitude of all the center antenna satellite reflections is 
only 201 miles. The range limitations of the interim DOPLOC system made 
reception of the higher altitude passes marginal and, consequently, the 
satellite reflections that were received were from the lower altitude 
passes. 
In Figures 20-25, however, there are a total of 52 satellite passes 
charted, ranging in altitude from 95 to 658 miles. These passes represent 
all of the satellite crossings that were predicted for the DOPLOC system 
during these periods. Of these 52 passes, 1? (or 555t) show evidence of 
several flats near satellite pass time and the average altitude of these 
17 satellite passes is 552 miles (see Table IX). It should be pointed 
out that the limitations of the DOPLOC system do not apply here, since 
we are concerned only with observations of flats, as opposed to flats and 
satellites. Since flats are assumed to be considerably larger than the 
associated satellite, it is felt that reflections would be obtained from 
flats at high altitudes even though no reflection would be received from 
the satellite itself. 
* i^rom 10 minutes before pass time until 20 minutes after pass time. 
' hi
■ 
Comparison of the data In Tables I and IX Indicates that formation 
of flats Is apparently not entirely dependent on altitude, since by more 
than tripling the altitude range of the data examined, the flats observed 
only increased by approximately 836. Based on these data, it would appear 
that flats may be observed almost aa frequently associated with satellltea 
at low altitudes as at high altitudes. 
k2 
...,.ij^..-.i-^^ ■■—^v.
TABLE IX - SATELLITE AlfTITUDE VS NUMBER GF FIATS 
.■ 
Date Satellite Altitude Miles 
Number of Flat8# 
in 30-Mln. Period 
Ik Sep 59 58 Delta 2 UJO 2 
17 Sep 59 58 Delta 2 658 5 
15 Dec 59 58 Delta 2 U92 6 
16 Dec 59 58 Delta 2 U85 7 
17 Dec 59 58 Delta 2 1*82 12 
18 Dec 59 58 Delta 2 U78 5 
21 Dec 59 58 Delta 2 19k It 
12 Jon 60 58 Delta 2 MO 5 
15 Jan 60 58 Delta 2 186 7 
Ih Jan 60 58 Delta 2 186 2 
16 Jan 60 58 Delta 2 l»01 11 
k Apr 60 58 Delta 2 95 2 
15 Sep 59 59 Epsilon 2 210 1* 
111 Sep 59 59 Epsilon 2 Xhl 3 
16 Sep 59 59 Epsilon 2 IkO 2 
5 Apr 60 60 Beta 1 451 10 
6 Jun 60 60 Epsilon 2 201 5 
Average 532 
*From 10 minutes before pass time until 20 minutes after pass time« 
hi
C. Meteor-Induced lonlzatiou 
Reflections from meteor trails may account for some of the flats 
observed, particularly in the December and June samples (Figures 22 
and 25). The Ursid meteor shower normally occurs during the period 
17-24 December with the maximum activity on 22 December. During this 
maximum, a radio-observed rate of 15 meteors/hour has been reported.10 
Similarly, the daytime Arietid and daytime Perseid showers reach 
their maximum on 8 June and 9 June, respectively, which would place 
them in the interval charted in Figure 25. For these showers, the 
maximum hourly radio-observed meteor rate is 66 and k2, respectively. 
A meteor passing through the ionosphere forms Initially a large, 
cylindrical, ionized column, and maximum reflection or signal scattering 
is experienced when the incident wave is normal to the long axis of the 
cylinder. The passage of a great number of meteors (as in a shower) 
could quite conceivably form many large, ionized columns which, upon 
diffusion, would overlap and effectively blanket a considerable area 
with a slow moving ionized cloud. From a cloud of this type having a 
reasonably uniform density, we might expect to observe a single, con-tinuous, 
long duration flat with a strong signal level. However, if 
the cloud was patchy and non-uniform, then the reflections received 
might be intermittent, with shorter durations and varying signal strengths. 
kk
V. CONCLUSIONS 
Baaed on the data presented in this report, several conclusions 
appear rather firm. First, when a flat Is observed In connection with 
a known satellite passage, the signal level received from the flat Is 
usually stronger than the signal level received from the associated 
satellite. This would Indicate that the dimensions of the reflecting 
mass are comparable to or larger than those of the satellite. 
Secondly, satellite passage cannot be accurately determined by 
merely charting the occurrence of flats against a time reference. The 
appearance of a large number erf flats in a short time Is not a reliable 
indication that a satellite has passed, evidenced by the data presented 
in Figures 22-24. Attention is called to the many groups of flats, not 
associated with a satellite crossing, which appear very similar to those 
groups of flats observed in the vicinity of a satellite pass. 
Thirdly, satellite altitude does not appear to be a factor In the 
foimatlon or detection of flats. The DOPLOC system recorded flats 
associated with satellites at various altitudes, ranging from 110 miles 
to more than 600 miles. 
HAHOLD T. LOOTENS 
^ 
:' ■ ■
REFERENCES 
1* ?! tey*1" <*•, Richard, V. W., Hodge, A. H., Pattoa, R. B., 
Adems, C. L. First Semi-Annual Technical Summary Report, 
Il850(l959)ly 1958 " 51 December 1958- mL Me,no ReP01"* No- 
2. de Bey, L. G., Richard, V. W., Fatten, R. B. Second Semi- 
Annual Technical Summary Report, Period 1 January 1959 - TO 
June 1959. BRL Memo Report No. 1220 (1959). 
5. de Bey, L. G. Third Technical Summary Report, Period 1 July 
19^9 - 50 June i960. BRL Memo Report No. 128? (i960). 
Hodge, A. H. Final Summary P-nort on the BRL-D0PL0C Prelect. 
BRL Report No. I.I56 (1961). 
k. 
5. Kraus, J. Evidence of Satellite-Induced lonization Between 
Hemispheres. Proc. IRE, hQ, 1913-1911+ (i960). 
6. Kraus, J., Higgy, R. The Relation of the Satellite lonization 
Phenomenon to the Radiation Belts. Proc. IRE, 1*8, 2027-2028 
7. Kraus, J., Higgy, R., Crone, W. The Satellite lonization 
Phenomenon. Proc. IRE, 1+8, 672-78 (i960). 
8' ^nk-%L' V^6 of Variation of the Signal Strength from 
1958 uelta 2 (Sputnik 5). Nature, 185, I385-I384 (1959). 
9. Adams, C. L. The DOPLOC Instrumentation System for Satellite 
Tracking. BRL Report No. 1125 (1961). 
10. Whipple, F. L. Smithsonian Institution Astrophysical Observatory 
Oorrespondence with author dated 25 May 1961. 
k6 
^;^,^.v:i^!.:^:-:i:^^.-::^:-L:^-;;y;j:.;..i;.,1^L,;i,(^^^ ._ _
VII. BIBLIOGRAPHY 
Coova., Sao Ma8o, cISÄ^.^"^.^^: ^i^?- 
Feb 196x7 ^put,liJt ni> ,,,ade " Klruoa Oeophyalcal Observatory," 
^ wT$Th*-£$r& %4:^ "Iteai0 E"e«1°" " «laat Satemtea," 
9' In VZiX» "Ä ^strr f,3^"oä by tbeir mnuaaoe 
Colorado, Del ijeö. *' pre8ented " Joint UHSI-IBE Meeting, BouUer, 
l»7
APPENDIX I 
BRL-DOPLOC REPORTS 
No. 1 BRL Memo Report No. 1055 - October 1958 
v?>?Plpr l1**?* ^AnteQna Orientation for a Doppier ßyßtem" 
by L. P. Bolgiano, Jr., CONFIDENTIAL J' " 
No. 2 BRL Memo Report No. II85 - January I959 
First Semi-Annual Technical Summary Report 
Period 1 July 1958 - 31 December I958 
by L. G. deBey, V. W. Richard, A, H. Hodae R. B Pa+ton n T A^ » 
(BML 59-60) CONFIDENTIAL ' tt0n, ^ L- *****•' 
No, 5 BRL Tech Note No. 1265 - June 1959 
"Orbital Data Handling and Presentation" 
by R. E. A. Putnam., UNCIASSIFIED 
No. 4 BRL Tech Note No. 1266 - July 1959 
"An Approach to the Doppler Dark Satellite Detection Problem" 
by L. G. deBey., CONFIDENTIAL 
No. 5 BRL Memo Report No. 1220 - July 1959 
Second Semi-Annual Technical Summary Report 
Period 1 January - 30 June 1959 
by L. G. deBey, V. W. Richard and R. B. Patton., 
(BML 208-59) CONFIDENTIAL 
No. 6 BRL Teqh Nate N0..I278 - September 1959 
"Synchronization of Tracking Antennas" 
by R. E. A. Putnam., UNCIASSIFIED 
No. 7 BRL Memo Report No. 1237 - September I959 
A Method of Solution for the Determination of Satellite Orbital 
Parameters from DOPLOC Measurements" vrui^aj. 
by R. B. Patton, Jr., UNCIASSIFIED 
No, 8 BRL Memo Report No. IO93 - March i960 
"The Dynamic Characteristics of Phase-Lock Receivers" 
by Dr. Keats Pullen., UNCLASSIFIED 
No. 9 "Station Geometry Studies for the DOPLOC System"' 
Stanford Research Institute., UNCIASSIFIED 
N0' 10 "^^em^esS^^^^ ^"^ " ^ ^ 
by W. E. Scharfman, H. Rothman, H. Guthart, T, Morlta., UNCLASSIFIED 
No. 11 Philco Corporation - h May i960 
"Polystation Doppler System", UNCLASSIFIED 
k9
BRL-DOPLOC REPORTS (cont'd) 
No. 12 Space Science Laboratory, General Electric Co. - October i960 
"Orbit Determination of a Non-Transmitting Satellite Using Doppler 
Tracking Data" 
by Dr. Paul B. Richards., UNCLASSIFIED 
No. 13 Fined Technical Report - University of Delaware - June 15, i960 
"Quantum Mechanical Analysis of Radio Frequency Radiation" 
by L. P. Bolgiano, Jr. and W. M. Gottschalk., UNCIASSIPIED 
No. Ik Final Report F/157, Columbia University - February 11, i960 
"Summary of the Preliminary Study of the Applicability of the Ordir 
System Techniques to the Tracking of Passive Satellites", UNCIASSIFIED 
No. 15 BRL Report No. 1110 - June i960 
"Precision Frequency Measurement of Noisy Doppler Signals" 
by W. A. Dean., UNCIASSIPIED 
No. l6 Third Technical Summary Report - Period July 1959 through June JO, i960 
BRL Memo Report No. 1287 
by A. L. G. deBey., UNCLASSIFIED 
No. 17 Columbia University Tech. Report No. T-l/157 - August 1, 1959 
"The Theory of Phase Synchronization of Oscillators with Application 
to the DOPLOC Tracking Filter" 
by E. Kreindler., UNCIASSIPIED 
No. 18 BRL Tech Note No. I3I+5 - August i960 
"DOPLOC Receiver for Use with Circulating Memory Filter" 
by K. Patterson., UNCIASSIPIED 
No. 19 BRL Tech Note No. 155^ - October i960 
"Parametric Pre-Amplifier Results" 
by K. Patterson., UNCIASSIPIED 
No. 20 BRL Tech Note No. I367 - December i960 
"Data Generation and Handling for Scanning DOPLOC System" 
by Ralph E. A. Putnam 
No. 21 BRL Report No. 1125 - January 1961 
"The DOPLOC Instrumentation System for Satellite Tracking" 
by C. L. Adams., UNCIASSIPIED 
No. 22 BRL Memo Report No. I55O - March 1961 
"DOPING Observations of Reflection Cross Sections of Satellites" 
by H, T. Lootens., UNCIASSIPIED 
No. 23 BRL Memo Report No. 1362 - August I96I 
"Satellite-Induced lonlzatlon Observed With the DOPLOC System" 
by H. T. Lootens., UNCIASSIPIED 
50 
■. . , ■ ■ ■ . ; . ■ V:- . ■ '. ■ ■ ■ ■ ■ •■■.■■■■■■■
BRL-DOPLOC BEPORTS (cont'd) 
In Preparation 
No. 2k "DOPLOC Comb yliter" by R. Vltek 
No. 25 "Final Summary Report on the BRL-DOPLOC Project" 
by Dr. A. H. Hodge 
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ARPA-BRL DOPLOC DOPPLER RECORD OF 
58 DELTA REV 9503, FORREST CITY, ARKANSAS 
MEASURED 0014:30 Z, PREDICTED 0043 Z 
ALTITUDE 130 MILES, 56 MILES EAST FT. SILL 
CENTER ANTENNA, NORTH - SOUTH PASS 
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Redstone Arsenal, Alabama 
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1520 H Street, N.W. 
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Chief of Staff, U. S. Army 
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Satellite induced ionization observed with the doploc system

  • 1. UNCLASSIFIED AD 265 072 Reproduced Inf. the ARMED SERVICES TECHNICAL INPORMAnON ACENCY ARUXCTON HALL STATION ARLINGTON 12, VIRGINIA UNCLASSIFIED
  • 3. NOTICE: When govemnent or other dxawliiÄS, speci-fications or other data are used for anTpiiSse ZyVJZS ** COimection vith a defln^lHSated government procurement opeiatlon, the U. S. ^SSJfnn STby lnCUr8 no «sPonslhlUty, nor any obligation lAatsoever; and the fact that tte Govern- SnfJ^ fonnulat^, furnished, or 1^^^ Sifno^t8^ draWing8' ^^^catlons,^ ^her w?^ « ?n ^ re8arded ^ implication or other- Sher Li^ naXmer llceMln« «I« holder or any or Sitr? 0f ^^«»tlon, or conveying any Sits ^tSSS ? OI1 h0 "^^^^e. use or seU. an£ ^ patted invention that may In any vay he rSated
  • 4. c L '*, CO v •i. »*s| O "eg" Mil IJIIIHIII II'IUIII IÄM mil mi MEMORANDUM REPORT AUGUST 1961 NO. Iill 1362 SATELLITE-INDUCED IONIZATION OBSERVED WITH THE DOPLOC SYSTEM ARPA Satellite Fence Series Harold T. Lootens *oV Report No. 23 In the Series Department of the Army Project No. 503-06-011 Ordnance Management Structure Code No. 5210.21.14303 BALLISTIC RESEARCH LABORATORIES ?™?™?Ba,,Ba!aele»«MS^^ "■ii'ii" 'iriVn iV;.:^-^.-^.^^^ ABERDEEN PROVING GROUND, MARYLAND ■:
  • 5. ASTIA AVAILABILITY NOTICE Qualified requestors may obtain copies of this report from ASTIA, This report will appear in a journal and will be available to the public. .■:,■ / ■■ ■■■<.:. -■"
  • 6. BALLISTIC RESEARCH LABORATORIES MEMORANDUM REPORT NO. I562 AUGUST I96I SATELLITE-INDUCED IONIZATION OBSERVED WITH THE DOPLOC SYSTEM ARPA Satellite Fence Series Harold T. Lootens Ballistic Measurements Laboratory Report No. 25 in the Series Department of the Army Project No. 5O5-O6-OII Ordnance Management Structure Code No. 5210,21.1^503 ABERDEEN PROVING GROUND, MARYLAND
  • 7. BALLISTIC RESEARCH LABORATORIES MEMORANDUM REPORT NO. I362 HTLootens/bjk Aberdeen Proving Ground, Md. August I96I SATELLITE-INDUCED IONIZATION OBSERVED WITH THE DOPLOC SYSTEM ABSTRACT This report presents a series of constant frequency Doppler reflections obtained with the DOPLOC "dark" satellite tracking system. These reflections, termed "flats", are associated with satellite Doppler reflections and are of the type that would be received from a large, low velocity, ionized cloud. A tabulation of flats recorded at times other than satellite pass times is also given and a dis-cussion of meteor-induced ionization is included. . ,.,■.:,,..: v.:;;;..,..:- —^.^.v.-;,.
  • 8. XABIE ÜF CONTENTS PAGE I. HfPRODUCTION 9 II. DOPLOC SYSTEM DESCRIPTION 11 III. DATA FORMAT 12 A. Doppler Recording 12 B. Signal Strength ..... 12 C. Multiple Antenna Records IJ IV. EXPERIMENTAL RESULTS 1^ A. "Flats" Associated with Satellite Passage 1^ B. "Flats" During Random Periods 16 C. Meteor-Induced lonization kh V. CONCLUSIONS . . . , k3 VI. REFERENCES , 1^ VII. BIBLIOGRAPHY ,...., Vf APPENDIX I. 3RL-D0PL0C REPORTS 1^9 , s
  • 9. LIST OF FIGURES Figure No. 1. Basic Interim DOPLOC System 2. AJRPA-BRL DOPLOC Doppler Record 3. ARPA-BRL DOPLOC Doppler Record k. ARPA-BRL DOPLOC Doppler Record 5. ARPA-BRL DOPLOC Doppler Record 6. ARPA-BRL DOPLOC Doppler Record 7. ARPA-BRL DOPLOC Doppler Record 8. ARPA-BRL DOPLOC Doppler Record 9. ARPA-BRL DOPLOC Doppler Record 10. ARPA-BRL DOPLOC Doppler Record 11. ARPA-BRL DOPLOC Doppler Record 12. ARPA-BRL DOPLOC Doppler Record 15. ARPA-BRL DOPLOC Doppler Record Ik, ARPA-BRL DOPLOC Doppler Record 15. ARPA-BRL DOPLOC Doppler Record 16. ARPA-BRL DOPLOC Doppler Record 17. ARPA-BRL DOPLOC Doppler Record 18. ARPA-BRL DOPLOC Doppler Record 19. ARPA-BRL DOPLOC Doppler Record 20. Flats and Satellite Passes, 22 21. Flats and Satellite Passes, 15 22. Flats and Satellite Passes, 15 25. Flats and Satellite Passes, 12 2k, Flats and Satellite Passes, 31 25, Flats and Satellite Passes, 6 • 26, ARPA-BRL DOPLOC Doppler Record 27, XRPA-BRL DOPLOC Doppler Record 28, ARPA-BRL DOPLOC Doppler Record 29, ARPA-BRL DOPLOC Doppler Record 50. ARPA-BRL DOPLOC Doppler Record 31, ARPA-BRL DOPLOC Doppler Record 32. ARPA-BRL DOPLOC Doppler Record 35. ARPA-BRL DOPLOC Doppler Record of 59 Kappa, Rev. 183 of 58 Delta 2, Rev. 8386 of 58 Delta 2, Rev. 66k5 of 58 Delta 2, Rev. 8683 of 58 Delta 2, Rev. 8719 of 58 Delta 2, Rev. 9009 of 58 Delta 2, Rev. 9^72 of 58 Delta 2, Rev. 9503 of 58 Delta 2, Rev. 9716 of 58 Delta 2, Rev. 9826 of 58 Delta 2, Rev. 9832 of 58 Delta 2, Rev. 9937 of 58 Delta 2, Rev. 10001 of 59 Lambda, Rev. 96 of 59 Lambda, Rev, 1516 of 60 Epsilon 2, Rev. iVf of 60 Epsilon 2, Rev. 303 of 60 Epsilon 6, Rev. 301 - 26 July 59 - 17 Sept 59 - 21 Dec 59 - l6 Jan 60 Mar - 6 Apr 60 • 10 Jun 60 of 59 Epsilon 1, Rev. 532 of 58 Delta 2, Rev. 873I1 of 58 Delta 2, Rev. 99^3 of 58 Delta 2, Rev. 9959 of 58 Delta 2, Rev. 10Ö07 of 58 Delta 2, Rev. 10023 of 60 Epsilon 2, Rev. 356 of 60 Epsilon 1, Rev. 386
  • 10. I. INTRODUCTION During the period 1 January 1959 to 1 July i960, the Bailiatlc Research Laboratories, under funding from the Advanced Research Projects Agency (ARPA Order 8-58), operated a three-station, reflection Doppler satellite tracking system, extending across the southrcentral United States from Tennessee to New Mexico. This system, known as DOPLOC, (DOppler Phase IflCk), provided a means of detecting and tracking radio-silent, or "dark" satellites. Detailed reports outlining the planning, implementation, operation and administration of the DOPLOC system have been published1'2'5^ so no further space will be devoted to it here. A transmitting station was located at Fort Sill, Oklahoma and receiving stations were located at White Sands Missile Range, New Mexico and at Forrest City, Arkansas. The three stations were initially manned on a twenty-four hour, seven-day-per-week basis, as a part of the nation-wide satellite surveillance net. Following permission from ARPA to discontinue routine twenty-four hour operation, the White Sands station was deactivated and a nominal eight-hour work day was adopted at the Forrest City and Fort Sill stations on 1 October I959. The primary objective of the DOPLOC system was to detect and track non-transmitting (dark) satellites but the flexible schedule under which the field stations operated also provided considerable data from known satellites. Unidentified Flying Objects and meteors. In addition, the system provided much useful data relative to the satellite-induced ionization theory. It is the purpose of this report to present data on this highly controversial subject of satellite-induced ionized trails or clouds. Several workers in the field, notably Kraus et al. at Ohio State University 5' '7, and Liszka et al. at the Kiruna Geophysical Observatory in Sweden , have reported the existence of satellite-induced ion trails, Many othem in this field doubt the existence of such trails or are dubious about the reported magnitude and persistence of the trails. .
  • 11. ^ed lonlMtloa theory, hut rather vm preeent reaction date oht-uned fro. . ^e, ^ „^^ ^^ ^^ tjpe presented In tht3 report are de« „<.-., . - ..* ,,,,. äeflnltely not from satellites, since =o Tf'*"**- "" the fMt ttot^"lotion, occur a, a patent »oppier fre^ncy at the hiss .re^enc. level Inzestes th!t ZZT^ ™ ""^" ~-^«— - the .ronnd 10
  • 12. II. DOPLOC SYSTEM DESCRIPTION The DOPIXXJ system consisted of a 50-kw continuous wave, 108 nc transmitter located at Fort SlU, Oklahoma, which fed one of three high-gain antennas. These high-gain antennas emitted narrow, fan-shaped beams, one directed 20 degrees ahove the northern horizon, one directed vertically and one directed 20 degrees above the southern horizon (see Figure l). The signal reflected from a satellite passing through the trans-mitter beam was received at one or both of the receiving stations. Each receiving station had three high-gain antennas oriented to "see" the space volume illuminated by the transmitter. The reflected signal was fed through a receiver and a bank of fixed audio frequency filters, known as the Automatic Lock-On (ALO), to a narrow-band, phase-locked tracking filter. The tracking filter then tracked the Doppler signal as the satellite passed through the antenna beam. A satellite which crossed the base line joining the transmitter and receiver traversed each of the three fan-shaped antenna beams. This resulted in three separate Doppler records, one for each of the three antennas, separated In time by 5O-60 seconds. The length of the Doppler records varied, averaging about 7 seconds in the center antenna and 15-25 seconds In the north and south antennas. Data outputs were Doppler frequency as a function of time in a digital and punched tape format, as well as strip chart recordings of Doppler analog frequency and signal strength with respect to time. A complete and detailed description of the DOPLOC instrumentation system is available", so no further discussion of it will be presented here. When the DOPLOC system assumed twenty-four,hour operational status in January 1959^ the transmitter at Fort Sill served as the illuminator for both receiving stations. When the White Sands station was deacti-vated in the fall of 1959^ the antennas at Fort Sill and Forrest City were re-oriented in azimuth to produce a greater overlapping of the beams and better coverage. All data presented in this report were recorded at the Forrest City station. 1-1
  • 13. III. DATA FOBMAT A, Doppler Recording The typical form in which DOPLOC data are recorded is shown in Figure 2. The upper portion of the chart is an analog record of tracking filter output frequency. The short, evenly spaced marks indicate the sucessive frequencies at which the tracking filter is set while the system is in the search mode. Figure 2 shows the tracking filter output when the ALO Is scanning a 12 kc range. The AIX) can also he adjusted to scan a 4 kc or 2 kc range. The transition from step scanning to continuous phase-locked tracking is shown in Figure 2 at ITU:58 Z time. Concurrently, the digital counter and printer is started and the period of 1000 cycles of the Doppler signal is printed at one second intervals on paper tape. The Doppler period count for Revolution 185 of 59 Kappa, corresponding to the Doppler frequency analog record, is shown at the top left of Figure 2. The right five digits represent the period count, while the left iix digits represent Universal Time in hours, minutes and seconds. B. Signal Strength The lower part of the chart in Figure 2 is a record of the AGO voltage from the tracking filter. While in the search mode, the AGO is shorted, producing the clean, straight line at 2 mm deflection. When a signal is detected, the AGO voltage first decreases due to'an initial threshold voltage of opposite polarity existing on the AGO line. Then, as the signal amplitude increases, the AGO voltage in-creases as shown by the scale calibration. The chart is calibrated in received signal input power (in dbw) at the receiver input terminals and also in relative signal in terms of the signal-to-noise ratio at the receiver output, i.e. in db below 1:1 S/N at the receiver output. 12
  • 14. C. Multiple Antenna Records This one pass of 59 Kappa has been treated In considerable detail ' to explain the nature, quality and quantity of DOPLOC data and, con-sequently, the discussion has been devoted to data received by the vertically directed center antenna. In the next section of this report, examples of satellite passes recorded by more than one antenna win be presented. During the 18-month operation of the DOPLOC system, 111 satellite reflections were received, resulting from observations of 89 individual satellite passes (8 passes were received by two antennas and 7 passes by all three antennas). Of these 111 reflections, 67 were received by the center antenna alone or by the center antenna in combination with the north or south antenna. 13
  • 15. IV. EXPERIMENTAL RESUIITS A. "Flats" Associated with Satellite Passage Approximately 25^ of the satellite passes recorded by the DOPLOC center antenna (17 of 6?) revealed a constant frequency reflection, either preceding or following the Doppler signal reflected from the satellite. These constant frequency reflections, termed "flats" appear on the analog records as a horizontal line, close to or equal to the bias frequency of 7 kc^ indicating zero velocity. These Doppler frequency flats, which indicate an apparent zero velocity target^ could be caused either by a large ionized mass moving through the antenna beam at a very low velocity, or by a stationary ionized mass having a lifetime equal to the duration of the observed signal. On 9 of the records the flats produced a stronger signal level than the corresponding satellite reflection. The average signal strength of the flats (-170 dbw) is slightly stronger than the average signal strength of the satellites observed (-I71 dbw). Reproductions of DOPLOC satellite reflections showing evidence of flats are presented in Figures 3-I9 and a tabulation of the data is given in Table I. Of the 17 satellite records which reveal flats, 12 are reflections {from 58 Delta 2 (Sputnik III). The other passes displaying flats are records of 59 Lambda (Discoverer VIII), 60 Epsilon 2 (Sputnik IV rocket) and 60 Epsilon 6 (Sputnik IV fragment). About 65^ of the flats occur after (or before and after), the satellite has passed through the antenna beam, and all of the flats appear in the center antenna. Perhaps a brief explanation of the antenna switching procedure is desirable at this point, to indicate which antenna was in use when the flats were recorded. In Figures 13, Ik and 17, an abrupt shift in the ALO frequency scan is visible. This shift represents the transfer of power from one antenna to the next. For example, in Figure 15, the ALO scans the 2-5 kc range as the satellite approaches and is tracked through the south antenna. Following loss of signal by the south antenna, power is switched to the center antenna and the AH) scans the 6-9 kc range. This transition is shown at 0641:46 Z time. This scan is continued until the satellite has traversed the center beam and then a switch is made to the north antenna . Ih
  • 16. TABLE I - DOPLOC SATELLITE REFLECTIONS POSSESSING FLATS Satellite Rev. 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 58 Delta 2 59 Lambda 59 Lambda 60 Epsilon 2 60 Epsilon 2 60 Epsilon 6 Average 8386 86if3 8683 8719 9009 9^72 9503 9716 9826 9832 9937 10001 96 1516 147 303 501 Altitude Miles 172 156 1*13 186 15^ 130 150 285 189 110 158 12k 12k 137 2k0 213 iQk •Peak Signal in dbw Satellite Flat Flat Before/After Satellite Pass -I67 -174 Before and After -170 .172 After -175 -I65 Before -171 -172 After -175 -170 Before -172 -163 After -170 .175 After -176 -I'jk Before and After -176 -172 Before -171 -159 After -I62 -168 Before and After -169 .175 Before -I69 .i'jk Before -I67 -174 After -175 -16k After -175 -174 After J^Z5 ^173 After -171 -170 15
  • 17. and a 10-15 kc scan range at 06l»3:12 Z time. The chart recorder pen deflection was adjusted at 06'I'J:00 Z time and the satellite was subse-quently tracked through the north antenna. This completes the antenna switching and recording cycle for this pass. Antenna switching was performed simultaneously at the transmitter and receiver and synchronized "by teletype communication. In Figure 12, similar switching was performed as indicated at l3l2:5J* Z time, and the pen deflection subsequently adjusted to center the trace in the upper portion of the chart. It is probable that the flats observed in Figures 12, IJ, and 1? would have been longer in duration if the recording had not been interrupted by antenna switching. B. Flats During Random Periods In an attempt to determine if a correlation actually exists between satellite passage and the occurrence of flats, it was decided to chart all of the fiats and satellite passes which occurred during several arbi-trarily selected periods between July 1959 and July i960. The resulting charts are presented in Figures 20-25 and an explanation of them follows. The original records were recorded on ^wo-channel Sanborn chart paper. Type 651-52. During the operation of the DOPLOC system, over 300 complete rolls of this paper were utilized, amounting to more than 6000 hours of recordings. The six one-week periods chosen for this random examination are a representative sample of the total amount of data recorded. The first DOPLOC satellite reflection was received in August 1959, so the initial period to be studied was selected in July 1959, Just prior to the first reflection. Five additional samples were chosen at approximately 1-2 month intervals, covering the time until the DOPLOC system was deacti-vated in July i960. Each period examined consisted of.five consecutive days, with the exception of the charts in Figures 22 and 2k. The days that were omitted on these charts (19-20 Dec 59 and 2-5 Apr 60) fell on Saturday and Sunday, and the station was operating only on a five-day week at that time. 16
  • 18. Each chart represents five complete days, and each day is divided into four segments of six hours each, with the horizontal scale reading from left to right in Universal Time. The short, vertical marks rep-resent flats, with no regard for their duration. The flats vary in length from several seconds to a minute or more, but each one is rep-resented by a single mark regardless of duration. A tabulation of all flats, including duration and signal strength values, is given in Tables II - VII. The long, vertical marks represent satellites which were predicted for the DOPIÖC system during the period. Each is identified with the year of launch and the Greek letter assigned by Space Track Control Center. In addition, the altitude of each pass as it crossed the base line is given. The periods labeled "NO MTA" represent periods when the station was not operating; at all other times the station was manned and continuous recordings were made. Several of the satellite passes are markedt . Here, the passage of the satellite through the antenna beam was recorded and reproductions of these Doppler frequency observations are presented in Figures 6, 15, 26-53. Attention is called to the small number and random distribution of the flats in Figures 20 and 21. There is no correlation* with satellite passage in Figure 20 and only slight correlation in Figures 21, 2k and 25. In Figures 22 and 25, however, a number of excellent correlations are visible in connection with 58 Delta 2, perhaps because of the size and configuration of this satellite. Table VIII presents a summary of the number of passes in each period, together with the number of correlations and their iden-tification. In Figures 22-25, the occurrence frequency profile of the flats is radically different. Instead of a small number of flats randomly distributed, these charts show an increase in the number of flats by a factor of 3 or k, * ?°rr^lation denotes a minimum of two flats occurring in the period from 10 minutes before pass time until 20 minutes after pass time. These passes are underlined in Figures 20-25. 17
  • 19. Ov 0 0 H O H 'A ir u vo MS vo H H H H H H •••III ^.-2 ^ o o a o o r-t rirHHHHHf-li-IH '• I I I I I I ^1 fH rH & ^ s O irv irv s UN VO •O IA o !0 fO ^ •H rH H H Si vOirt--r-vOt^irir>u H• Hi Hi Hi Hi Hi Hi HI ^ CM I8 § 2> ."^ oyo^ooooooo tfsvg uNtAiniOirviAiKirtirv 'lllliiaiii vO »A o O VO % it) fi t- U a Qo CJ E-" 3 W 0 ä R (M O [<^ ir »O ""v Si S * 8 3 0<-IHr-iHrHrHW CM OJ o —' a o K ir-. OJ jAiQcO(DeoeOcoSco&o ooooooooooo VO OJ <J r-l IT» 0 tn rH ON lf t~- VO IA VO VO IT» 'oit-0Jir^0J0J^0iOOJ lo>H10JV0t^-j -t-fA01 iA OJ 00 rA KV -3- ^r H EH EH D H O» IA -3- OJ IA 21 »A Ov IA t-- H IA ^r (A 8 ■5, vo o vo -a co IA O H OJ tA OJ 3 3 3 1 3 % % S Z ~ - OJ CO OV VO t -=r O 'A IA -=f -^- IA IA IA IA CO IA CO IA H ^f O CO IA O IA W OJ OJ IA VO r- ON o o o o o o o rA OJ CTcrvoovovovovoovoov lAlAlAlAlAlALA H H H H M iHH iH-l IA IA IA IA IA IA IA IA H H IA H IA O A sU CO VO IA H H -* ON H it H IA IA LA IA CO o o o Ü o % % & & 3 ^ ^ o o oovovooovovoONOcr ^ ^ IA IA CA IA IA IA IA iA CA HHHHHH.HHHHH H lAOJOJVD OJlAC-OJ "N-^OOt^-lAOt-VOOOlt— OJOJOJOJlAH^-tAQIfSor ovr-oviÄt— öjoöt^-t-^Ht^- sErfc"<Bcocoooo OOOOOOHHH hA OJ 3 ^ 18
  • 20. HlACVllf(V)CV)lffrvK(V H H H CO CU H VO VO t^- H >H H O W H 00 (?> f- o CO in K iTi vo H H H H R S p! T 7 n1 rrv CM -* vo O j-irj r- O SSSR^äIRäR SKKäia^Sjgs?! IT» K> ^ rH CM 00 1^ IT» K t~ t^ CO 00 a, I »WONHiHiHCVltVj H <J CM OJ {J CVJ ir> vo o '0 2' 50 dcf-<) VwCOM liifArS V-IAO ?0i iOft iHo R D t- IT» CM lA lA O O CM CM Pi CM 5 r- r- ® P. 6 5 S & P= K & Ö Fl & R R R K H H <-1 H H rH ■ I 1 1 1 1 H H H H H H H covooo^rvoj-vo^j ^r ^r o oo iTi CM tr» lA CM H IS O . CM CM O H K"V Ö CM VÖ VÖ MHrHHi-iHrHCMCMCM S3 t H VÖ H fTl A lA J- US 1A 1A O Q K 1A VO VO O O O O O O a OH t-rr^-f-C-LArHHlA '-I'HHrHHrHHrH -* iA (M t- vo Ö rH H H t^ r- iA ^ vo »-H <H H H H 5» ON 0 Q ON K- O 1A lA 1A 00 1A CO OS H H H rH H H H " l I I I I I CO E-i 8 CM o CM VO !- H O To 'O VO iA j- ON ir CM LJ" CO vO o o o 3o OH I H oHir in fA tr H H O O CO KO to fO CO lA lA fO pr O -^• ^gVO IAcAONCMN-Nt--t-- IA lA CM lA H CM tA H jj Sltr^!0^,'iriCOirNON01AH ^ 2 d ^ ^ w, '^ ® ® « « ro m ON "Sv o CM O CU CM Si &i f& Si X? C* 0 ON ON ON fA 1A ON ON ON S-HHHHHHHHHHHHHHHH S S S t ^ F1 ^ ^ -v ^ -r ^ H Ed CM ONrAfAt--t— t^-lAlA^ rACO CM t- lA -d- CM MD CO ON t— O VO oo o ooo ON O tA CM O CM CM Q IA M O Ö co IA ON VO CM CM tA lA IA ^J-lA ^J-IA CM ON CO VO tA CO CO IA H O IA IA ^O H CM CM CM |f;ftlrj|AOHCMCM C^ O O O ON t- IA 00 -* H ^ IA ^ N- S O H H H CM H 00 O O IA ON 8 -$_ ri 'ii CM CM ON IA IA IA CM CM 19
  • 21. ii En 11 w g K 6- B a HI H §WI S^ EH P 1I iOn Ä HI rl m Ci t-7 VD VO H I p~- J- ^J-E-- C^ E-H H r-1 tr<- Kr! ^"^ IsA -v=o* W rH H H rJ ^ & i ä ^ I* ^ d ds ä ä ä ri si ^ 2? ^ 20
  • 22. <& Ä) fn S1 ,!£ .^ Ö r! 9> 9J 9^ 5' "^ ^- <>> "^ r- t- t- in i?-» o t-- N W HI H W Hjf i-icvrt H 00 »N J? (S CU SJ IS eg CO cc J CV; <H O IT» ^SSH!ft8 6xÄ«i>S8i5&Ä ^iiiiiiiiiliiliffiillilll Ö rt VO Q *?> Q r! Q ?- Qs >< ir ir r-irHr-{HrHrH»-)r-irir-! R £ H -H .-1 r-i P- S1 P t- f- VO •I "O ^T »A 0 CO H ö C^ ^* rH ON ^O fA »r t^- ao ^ vO !J c« f- K-! c <y. fs H iH % % P. tfS 8 is O VO ^ ^ 5 q 5 S. -o ^r ^-^-C^O^Or^r^^^^-(Hr^ "HrH^HCxj^OjCVtVCVjrj iA cy ir c: n vo iA vo ir Jr H rH H rH M C1» (> t^ J^ Q (^ U"v vo vO vo ? ifs ^fife's ■AOvvO^ IAIAIAJ- 88888888881 I .-P C,t^t^ri'xQ>r-'tri;rv'Aa-vr-i vOt— vovor-vOvOt— vovovovot— iHrHi-(Hr-!HH-H^(HHi-<rH I I I I I I I 1 I I I I I p in s y CO C7v ^"v _J •A a v IT» ' rH CV fA ~ Oi 5 c: r. VO 00 IA 00 IA CTv CJ CO CM 8 Ol 8 FA VO ?. -i 0,1 CO H ör. H if H lÄ -1 rA rH lÄ CVJ :- H i- H rA vö H H && 1 CNJ «^ ON CO fA CO ON VD C. ^ rH J-ON IH fA fA (A CM CC' -3- -* VO t^- lAlAuAirNlAlTNtAlA r- t- t- F- e-cc in g BÖ is fc o rA ."C1 S1 VO IA I"A^ ICA^N t"^^- VOON vOoN ^ON HHHrHHHHH I I I I l I I I ON IA ^ 00 ^f IA H 0J H CM 00 H IA CVJ CM lÄ •^•tAlAOJVOt^iAO CM O O CU ^ IA IA CM fK ^ t ^t" T*' 10 VÖ t^ I- IA ON H ON rH fH IA ITN h- IA P vn vn IA Hr Hl Hi H! Hi rH H! H1 h- Jf CVJ CM VO CVI tA Jf o c IA o IA O O CM iH IA O H H O O IA IA IA IA IA CM CM CM' O O O 00 CO O CO (A IA IA IA CM o C'J o ON ON IA O IA O IA IA O O IA cy IA IA IA -* IA IA O O iA t— IA ON vo vo VO IA -•■ H H H I I I I Ü o IA H IA VO iA n CM cy Ü IA J- VO r— n UN IA IA o KN IA IA rt H H H A 21
  • 23. ?f?3???3f?S5SSsS*S§SäSRS o ^t t~ 5 00 o o vo o OJ H KJ .A Ox ON rH m H CO a o tf •0 i- o vo 1^ K lr ^ t-- r- t- t- -H -< fH rH OK g SO Ö 0 H ir r- oo S S 1A CO 00 00 J- lA KN ^» 3 K OO H O K © R flrHr-'WHHfHHiHHCVJ O H vo 0 !0 KN IT» IT» O O O O CVJ C) W tl VO Cfv O» rH 1A IA VO vo vo H H H H R S> ."O "0 IA IA IA Q IA rH lA lA ■^ vq vb' vb" JK ? ? lA VO VO vo VO VO 'HHrHHHHrHM < I I I I I I I H H S> <J> 5v l^v ""V t— IA IIAA IA VO vo VO rH 1 H rH es iA :A vo O o J- <VJ rH CJ «5 O .* O J- »A ^t CVj CO CVJ lA CO O ffv w O tA fA vj) iA CO IA 00 J- O IA CJ VO CJ rH w CVJ ^ Ä o*. rH r-N CJ ■a t] a ■p § s) u 1 v->- lA ?> -1 & (Jv iA 00 rA IA CVJ J- j i|r oo cvj IA o IA IA uS TA lA VO rH o . tA CVI H IA IA IA fA IA Cl IA CU IA IA 8 S3 IA O R CVJ 5 O S JA S lA S? CO d5; iA 55 CD .CU I^»lÄ ßiA t^ ^ÖJ p -|Ä A lA Ö S P O irv S A' VO vp VO t^- -* VO iA IA IA W O t^ 00 K Pl Pi rH H IA CVJ w rH H a 1 ■ ■ ■ ■ i i i i rH H fA CO rH <M t— CJ -4- ,-( vo OH IA CJ O VO lA CVI vo IA H IA CVJ IA t^- SK f- IA OJ IA t~- IA IA IA _3- IA IA 4" VO VO H -* 3- J- J- IA IA IA IA IA IA H H M H H I lA CV O CVJ o •A IA CVJ CVJ O H VO 3 3% ■ H IA IA IA rH H a IA O O lA IA IA H IA IM J-O O IA IA CO Q O O O O vj i-i IA IA lA lA IA LA IA rH H H rH MD CJ Ov IA ^t ^j- O H rH H O IA IA IA H VO IA • . CVJ Ol IA IA IA IA IA IA IA IA tA H vq vq t- vo vo H H H H H I I I I I lAlAlAlAOvt^lAC— VO vg vo vo IA VD VO vo rH I H H IA H tA VO vo VO H H H I I I OO IA <Jv 0 IA rH VD IA vo VO rH H H rH ■ I I I 0Q 00 ITv pj o vo co 0 IA H H ^ IA IA vo 00 ■H vo vo Ov CVJ IA O -3- H ^t OJ rj iA iA IA OJ CVJ IA CVJ OJ IA H 5 o co lA H CJ o 8 1 RS s CO vö t^- CO KJ w CVJ o (A IA Ä O O o lAHlAOlAHOJH Hr^. lAlAlAlACVJCVj IT, (A ÖN H |Ä lÄ Ö VÖ H i' VO C0 IA S H di IA IA 4 .* O O o o O IA VO IA O IA S CTv O H IA 3f 3 _ IA IA IA IA H r fCTv IA Ch R rH VO 22
  • 24. IT» VO f- •H fH fH Q IT» IT» C VO VO vO I (Vj 0 O n i-l rH Ov VO 9 00 t~- cvi ^f ty 3 W M VO H R H » VO H cvi cj •^ H vo CO o H CO 3 S S 3 fc S? 3 £ fc S S 3 ß & & 3 A £ £ £ •H cu K 1A o 01 «3 ( OR M H t— CVJ ITV CVJ K> if) vg i^ co o o ir t^ (Ö 1 S6! EH S is iTi ir ox VO vo <2> vOvOvOvovOvOvoP £ S « r< vo a? lA O »A ro »o IA fA H H ^r j-eg CJ s & HI OJ O OJ CVJ t-T VO VO ® VO VO I 10 ® ® ""»OOCTxiAOCOvOlA CVJ -H ^ J- ?: » Ot— OviTilAiAH-iVO J-J- (AiTvOlAlAO » Ö » & ^ ^ 8 CO O CVJ N> lA 03 !0 •? •? ■? •* -^ Ql OJ CJ CM (M CM O O O O O O R R S( « ^ 8 ^ P ^ ^ Ä ^ 3 oooooooo o o ft 0 ro O CO K- tA <J ON t— CTi C lA o 1A VO VO 1A VO vo iA H iH H H H H H > I I I I I I SÄdS^^^®^^««^ ^ ^ 5 Ä ^ ^ ^ O IA CO d ^ ^ o o o 'A O lA O tA "?» Ö ^- IA VO VO CO ob' ö CM IA rA rA IA IA IA ^J-H H O O IA lA (A lA 00 O O tA O CM H H . O O O O lA lA VO t^ H H r-( H CM CM CM CM CM CM (M O O O O O O O CM CM CM ^t . CM CM CM CM O CM CM o o CJv IA IA CT IA t-- CT IA 1AVOVOVOVOVO LAVO HHHHHHHH > ■ I I I I I I t H H H ^ cr oo t— co j* 1A tA VD O VO H CVJ P -* H CM CM OJ J-H P CM OJ lA cu r-l oj CO 00 00 . VO VO K t~- 00 ON IA IA OV Ov J- O fA IA IA H ^t VO Q CO O IA ,? ^ ^ CM [- O H fv tA tA J- IA sJdäJSlgjgfgiai o ^ K'^tr'AS-^'^CAOOCMVOO OOr-iOlAtAtAtAHtAHO ;' ri ;1 I I £! ^ » I' O O Ö o o o VO OJ ^; oooooooooo BK IH 23
  • 25. gl (»< M TJ W S S 2J HI CD CO VO H 1A 00 1A H 8 H H H "^f- IA IA VO HI tA I I IA J» 00 I* 7 0 H IA rd P •-* rH IA W IA CM CM IA lÄ lÄ S ^ Ä 5 S 3 o o O O Ö Ö O CO o o ?. If O Ö o H Jt CO IA O ■A 5 H "A t-7 O IA J 00 CO Ssd c! 'S I^AIIAA IAiAKIASIIäA S3 8 O vö IA 1A 'Ä vo fl i^ ^ r- ^r oo h- S t— VO ^^??F:fi^^ H H H PH I f; f; PI t; ^ H H I I ■A W CM IA CM H c»vi- »cv-RK ^"■ Sc3 ßiK^^a^n ^Ot-IAKAO^QlAlAOJVOOO +> O CM O I — IA § In 3 < pu M >a g . M W El Ü IA CM n "AOiAiA^r^rcvi^g iA a.' o o I r1 IH co t»- t- vo H rt H K! 8! ^ ^ ^ Ö 3 3 CM vo -a- H 0 IA vo H VO OH r-: O r- CM IA H oo r- ^» -» IA IA CM CM !~ >-i vq t- ov o IA TiS IA lA lA , r- W iA VO 0 o IA iA O ??S5SSSS55ES5SSfEf? IA 00 CM SS iA W f- O IA IA CM CMVO OilAlAiAlACOCM O Ov 9 s S S> CJV IA IA H t- O rl IA ^ IA IA (A CM CM CM IA J-IA CM < i i I 1 I i i i i ^K-^S^^s^-^öSR/äS- CVJ t~T P C'M CM J-H CM r-i IA 3- OO sl & ■* 7A O O IA CO 5 5 5> 5> OO Ä^ & ^ H H CM CM CM IA IA -S IA ^- CM CO CO IA CM O H CM ^ ^ CM Si CO IA iii^Mi»&»ssSSäSüa^iBiüISi^ü^^ H H 21+
  • 26. OK ^ r-l rH •1 r-i ^ rH -T H J J a.- ~3 ;o■: ar. t~ K- t- P r- r- r- r- t- t>- -,T t~ r-l r-i ^ rH ^ tH ^ <H r-^ H >H r-l Ü* 1 1 1 1 1 i 1 1 1 1 1 F- r- vo ?; f: ^ <-) rt rH H H f-l f= p; 5esg S S !ß ^ g a m ir CV; Ci VO a s 0 lf , o ■e Ma ■pc H o C; o 1 1A rH 5 Q O ä ir o lA iTv O O cy 1A 00 JA O IC Ö l/ US O CO CO ON (D lA f— lA O CV CJ CO C3 CN 0 I ONVO iAt— r~covoeo JW oboocSoo OHH CVJClOlCl(jCVICVJCJOJC« J- H H r- H t-- t-- t- t- e- H H H H H CM H[— iHHlAOO-a-HlACO ^R £ lA rH .H oj cy c. H TA IA IA CM 0J OJOOHHHHHiH VOVOr-t-h-t~-t--t-- HHHHHHHrH l I I I I I I I g t- W3 ON ^t CO J- irv ir o cy "A 0 H tA iH »O lA Cl 1A O O CO CM OJ CM CM IA CM IA ^C JA H IA CM CM O CD J; IA O rH US CM IA H H CM r-l IA -d-t~- OJ VO O -* IA IA ^t IA SEH iAJ-lAC0OOiHlAlAvpolA00lAOrHlAlACMOOOVOC0 P ' HHHHHCMCMCMCM^^lAlAOHi-lHHCMCMlAlA^lA HHHHHrHHiHHHrHHHiHrHrHHHHrHHfHHH Ed f4 £ rHOCOlAcrlAlAlAHCJHrHONCyiOH t~-lAVOvoiA'OVOVOt-lAt--t--lAlAlAS-HHHHHHHHHHHHrHHHH I I I I I I I I I I I I I I I I Oo IA (Ti IA H IA VO t-- H H H I I I ^3 t CO 21 IA J- 00 CO IA ^O -* H CM CM H IA IA H H H IA IA r-l OO o5 (A t- (A IA CO vo IA H t— CM IA jh yj vo C^f^CMCOHIAlAOJCOiH HOCMIAIAOCMIACJ lACM 0 ^f- VO CO CM J- IA IA IA IA lAÖCMiHH-d-J-lACMCMIACMtA^-IAO vqt--t--0ONCT0>ONO HHCMCM CM CMtA HHiHHHHHHCMCMCMCMOJCMPJCM o o CM VO IA H IA CM . IA IA IA IA H iH iH 03 H 25
  • 27. «T t^^ »^ H • ill ^-^ g u t^ o o b- H H H ff?????? '0 »a üJ^RSS c, s •^VOVOoOgoj^^ "A J!j ^ H 00 H irv ^ UN m IA 8 3 8 3 3 a sH ss R ä o S » !0 iD K 5 A3 ;o-> o« osc1 oa> o o o ^Q1 ^Ho ioH c^o5 ^ vo >3 >3 o O O O ITS CO H CM II O o o -^ H O O II (A w fH ^« ä ä •H •D H IT» >A IT» H 21 •* ir "> W K S K ^g 0 S £ S £ £ s .* £ £ .H H H c5 w <S H ^ ^ ^101 ^o ^cu ior ocd o .» o o IA o 8SS§£ft&3 H O O "^ ON OJ ^ IA j. CV/ MD K ^ ^ Ä 53 IQ p ??.????°^^^o5 iiigiiilliiililigiiii^li H E-l EH Ö ???S§§f??n?g;i J t ^^^^^i^^^^S i H H sasS9gS.Rffi.aK^„s^^sa_ oq o MJ W O 3 ^ftSSSf^ ■^ Q ^Sg^^^^^o,^^« ö o O O Ö 26
  • 28. tr^*- tr±t i^. frZ* Zr>I ZrtI ZI C* -HHirkOvQ. J P "& F! Fl Pi 11 ^ <.t* «t- tirf H rl rH ^( HOVSa^^^cO-'^^t-^vo^^1/Nt0 i KN J- JJ j» W ^g i gp* w -a V) O» UN l/ ,-1 ,. vo o o vo vb •H ri ri rt IO rl CK IA u ^i rH MS vO vO - rt U> ITv a H rt t>- N r- Q) rt rt IT» <J i d r* "0 r< -^ rt t^ t— t- o t~- t^. p rt rt rt rt rt rt rt I " o t^ J- CVJ , w ^i vo cy cvi in ir> o i^ ITi rt rt rH CV) 9 o 8J 3 Pi 0 rr a 0 f= ^ oÜ > 0 r^ m CJ (D rt C« rt -» i»S ?, IIIIIIISH«*?! in rt ■^ OJ O -r rt H rt rt rt rt l^i 0 lO rH rt rt SI «^ er» o H o r- vo vo t^ vo rt rt rt rt rt i^> Ox t^ -»-aw rt H ^ 0 ^ VO o o cy IT» 3 ir ir a 0 CVJ -a -» 1A 1A IT» C3 O -» -» -5 ^r L-v ir> rt rt rt rt rt rt t^- CJ rt VO vo K rt rt rt "v rt O CO % O t-rt OJ Si OX OX 0 H VO VO VO v3 rt rt rt rt IA IA rt KS O 'A rt O rA &i$itkili*% tA OX rt IA !* S o o o o o o o Ox IA i m cp O KJ -5 -^ ^ -* tx IA (A if tA rA IA O O O O O O LA VO CJ IA tA O CXJ IA IA W OX CD -* IA SCVJ xo OX -* J* JT IA IA IA tA rt rt rt r-( Fi 3 IA IA ^f fi rt ox OX IA IA IA IA J)- xo H Ox IA HI OXOXIArtLALArHlAI/x^ rt rt rt rt rt 1 1 rA IA rt Ox tA ox rt rt rt rt K- rt IA IA $ ^ 81 K 3 IA Ox Ox IA [~- r— r 9 S $ t<X o fX n 3 RS o o CJ o o o O 3 00 IA o OJ CJ o 27
  • 29. si :< ^S1 . r- vo H H H vB P r~ P-H ^ H H i-t I l l t"? rr t~ r- SSSJJS^^sl fc 0 o u ca irv t- j» BS o r- -» MN lf IT« K CO « 00 S to • io i's -» 3 w R « Ä d « ?> t- t- hA S iU A" v ^ S cdS ^ 81 a» 8 if 8 3 K ^g H A: A: •• •• o o o i-i H 11 Q 'A KN <£ o ir r- ao 3 .^ ö flJ w H "J IA in IT» £ S bdr tr<- •r*- H H ■-( ^cS^^^pl^8^.^r< H H H H H <^ Jf* -» H . , i/> t- r- f- >5 H H H H H H^ Fl ®H H t£-> td- ^t- -r»- ««3y H H H H H 1 ■ I I I -* OJ CO CO K rt W 3r W ON J H ^S^-Sj^ag^-uj^jJ^c,^ o^ 21 ft s U t^ J-u H irt t-o 01 CO O (J -j u> g cvi K r- ^ 8 S 8 8 8 1 i ITi ft 0 K"V 0 O OJ OJ OrtiPÄ^^ÖvÖcÖ -* CVJ CO m iA cvi IA J- o 3 q> cr» cvi R§||i -* IA IA ä3iifiliiiila i t St-- hH- v■-o< H H H JO d F1 Ü P ü ^ r» H ^ S § f1 1 H H H H ^ Pr I 00 CJ 81 m iA O .JA .A JA CU H S S? 81 w ^ ^ ""* IA IA CO tA I 8 ?f ?gf f &5f &See§^^Fl&fc^ -* VO CO p ■A ON VO ON <M W IA IA Si s W VO -* VO in rA -* O SS^B^^IS&ä & &' & a ^ ^.^ ^ ^ in w CO H H « t~- CO ■ cy r ^T CA t^ (A IA VO s- 111 H IA f- iA OS ^ VO IA H r-l H J- -* VO tA IA t~- 0 IA CO "> o ai o »O IA ft s< ^ IA ! ^^sIAaIAs^(As^ isi^is^U^ ^ 5 H H 28
  • 30. 3 :« o ^ H -a (a & tr t ^ Cr ^r P: fr P- e o p- {- Jt j- .st r- p- t- i- t- H rH H H H f= P: p: Ä fr f: 10 H H H H -» -3 f- ir> o r- irv H H H CM r- ITS o co si ^ R -* Ä OJ g6: co in IT» VO U3 in o VO VD Ä ^ S4 21 -T CO 0 O IT» O (VI rr m > ll 555E???SSSS?5SSä5fSSSSEfS CO m ON iH H fc ^ o ^ ir ITN -■» CU VO o w -a o cj CJ CJ W f- t^ Ov O vo IA -3 m VO to >A rr m SS IA t— t-- i~- r- t— H ^1 r-< cj CO rr> 8 3 S ^ H -if vö Ö •* J* -S IA I— t~ ^ t~- ^ cH rH rH >-l W OJ IA IA 01 & 9 IA t*" W 0 H IA IA CVJ OV IA H CVI R "A C-- 00 CO CO CVI CVJ O -H H CVI H V-; v* ^i «TI ^vj i» i Äi» » Än t Än n^> s-J ^^T OvONONONCrvOvOvOvONONavON HrHHrHi-HrHHi-l^l^ fA IA iA H t— t^ vD f- ON IA IA VO Jt rA t— t^- t~- f- H H H H 'III IA (A t— iA IA t-- . . t-t-r-t-t-t-c-rf-KH-vo'vo oo IA CO fA CVJ IA VO tS~. tQ~-. t9~. Sp aj ck o r- H H JA H rH tA IA H H "vcvjr-cnvovDHvomr- vo vo vo -* CVJ H H H H H cvi CO IA IA CTV H CM O IA -3- o IA h- t~- o H IA -3- VO OD ßi Si Si Si lArH^Hr-lAIAOV HrHHrHHHHH I I I l I i I I l fi IA f: fi l HH-=f Pi H H( H ^ tA H H LA t^ h- t-- P- F- HI H1 H1 H1 H1 Rl ^ ^ IA C^- IA VO H !H w IA H CM H IA IA CJ -3- h- H -* VD LA CVJ O IA o lÄ IA IA IA cycg gvvovo o avco t-vo Ho^-ocvJacviaim^j ^ ? -st- H ^ co av IA J- S $ 2 Q CVJ fi^^-3d!l?'£}^äöj-^«>tÄiÄvöt^o;iH O H IA tA ^ H ^ ^ ^ -=1- H 29
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  • 36. ni^pp^iofrp^pfi^^^^c^c*.*^ H H H «H H H H H rt ir> o a a t- o-, S^ÄSl-^^rtSRslS^^SfüJSlÄÄ« K> 01 Q H rl H H s P PS 1= ^ p fi H H CVI O C 00 l .^ .2> S^ "^ ^ cy ir» r- S S ^ gi 21 R !O£> ro5 l«<V OJ -» lÄ ^ 2j » o o o 8 vo r- o cHy Hcvj Hcu o o o 10 ' ^ ' o C CO Qj a ir> .» vo ^ -n tvi w w co i^ r«- >0 i-4 Ä 1A h^ I t— IT» CO ri SOJ in o o i lA CO H CVJ O rH C) fc ^ s ÖS . 0 (^ -ET i/ CVJ rA in O O o CM c o VO a Q O H S ta 5 < J- ir> IA ir, z s r- r- t~- i^- QjO ^ H H rH 00 s H CVJ f- t~- C J f- h- vo o f- H i-i t-t i-t ri in IA r-| Fr f- r>- H rH ^ IA t/N C r- vo vo H ri w ^g »A KN f*- f^ t tr t r- H W i-1 w O • g H -A OJ 21 t~- m a cvj ON r- S< 2i d ^ a CA 00 ■-1 -* -3- VO H KN ?5 W Q CD CVJ co co O ft cj rö IA IA H H CVJ CVI fA rH f- LA CVJ ►A fA CJ CVJ LA ^ "A VO M ON VO in s s i i 11II1 -» CVJ i OJ s f i rs R q o WOO tA fA VO JX r- o vo IA IA CVJ SfA IA VO 00 . Q Q g o ri ö ö '-< H o o o o o tfi H OV Ov rA ON CJ t-r^lAVO t--VO t-lvb W IA H -I H rH H W H H OV -* (A OV IA 3; »^ W H W 3 ^ ^ CVJ IA IA ■q-I ogvv ctv-j ciAvj cod H CVJ t~7 t-f- ON lA o r- vo t- H H H ■i 1 W ^ ^ ^ -=i; in vo H H CVJ 8 !^^:!C'lC'covo ooo lACVJO-d-OlAOJlA ON H J- ON I 8 a s s -a 5" 8 IA S IA IA i I o i:J | 3 CVJ VO t-- q ' "^ ^D t— (j^ ö d d ^ J? ^T t- -* Ov Q IA IA IA ^ ^ 3 K 5l 5) d 35
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  • 38. g >or uo u0 ^ i8 o 0 oj ir> «A fi CTi r -A ;— 0 -4 l/ ir h- t^ ir> u o u 01 S a s KN IT» 0 O in fi t^ 0 KA jf g^ § g ^ 7 -r 7 Ä s Jü Ä ^ w S5 § g Ä ^ 5 « si ■A K irv fr liS A S H fH fH «H w -H 'H OJ -■J W iR 5 IP rt H H R "^ H UN ir ir oj O t^ 03 to >A 1A H 01 CO lf ^t R 8 R 8? ***lisl£äS H t- t- <0 OS u CO >f 0 tr if K 0 ta H "N rt H rt H '?7'?r?77777!955 0 VO ovlAur?lA<0g^5jt0 s1 it K^ÄIQÄÖ^^RSJÄ^S Sirx H KS ir jr m Öi tn o o i^ iA SS j! 1^- ff vo OJ K> Ä^plg^ÄÄ^^^^^cg H -I K Jt 0 f- 0 8 <H i-l CJ K^ W OJ Rj00 W03^00 ^miA^j- tr u o w W o] S K lO VO VO o <J P p p O OJ r- t~- t- t~- r-i H H H H H 81 OD VO u-v tr o lA O in 1A OJ tA o -* ^ tA t^ lf Jt Jt t- t~ c- ■H H H V t 2* "T1 -^ "A «y -* -* O OJ H -3- rA O IA t- J(- in -a- P p !C S § ^ H H H rH H H h- co s ä si OJ O8 8 1A ^t Ol 1A lÄ VÖ OJ OJ 8 8 iA m ^ ^ IA LfN Ol 7??s?ff^Sfss?ssp§ IA in rA vo 8 H (A iA m 8 OJ r-f IA o u% o O VO IA H OJ OJ R H OJ ^ p ..: IA IA IA l^ O -=(■ in m H (A R ^ H H tA VO VO t^ H O (A 0] llllllllllllflllll ON tA OJ 5 IA ON H H oi a 57
  • 39. i s smsme s § ? ?ms s. W ^ Ox tr t-- t- ir H H H • I I t~- 00 f- UN CO rl rl 39^»»"»^ Ol <o Ox HA ir> K ir H H Ä » 5f "o HS r« H äS s ^ a 5 IfX ITx IA UN IA & J; S ^ B . H X ii v= •«• c: cv vc IA ^ s> ■-•> in HN ir j» - r-: r-> vo VO IA ?H■ HR S^ Sp Hp PpT OX CVJ VO VO ? « >£ 9 c: o e 4 V v * -• ilslStlllllflllp S3ISI n n »i ri i-j OOOOO m s 9•• o IA 9 CX E 3 •D . 7 "7 T «7 "7 H w r-: rH H ^J K • • : ■ is i-r »A co jf C o IA ^ ^ g •- ^ <-: -* H cQ H CVJ CVj t- JA Vji CO Ox OX ^ ■3 S S :- co CD B -5 it Cx vo H -rf" Ox C ja "> l-T P br va i- P 7 7 ^ T 1 7 I iCrx vVgD iCAx pOi H H i-t H H ^ H (M S r^ ^ I- VO O »A S ^ S 1? 81 | 11 | S S H' S1 5 ^f 2? 31 8 I IA CO O {— -* OJ IA CM w IÄ if vö q S 52 '■"' S 8 8 tSr 't£-r rl-*r ^i-- •r H" P!* H 0 Q VÜ Ox LA c L" 8 I b Si oj R ox ox vo 7 H » S i? I I i r i -* IA IA CO Q h- fV CVi CO O >-,. ^T IA CM s■£ sR Ss i^ ä-=t O O O O O g P i"- IA CO H IA IA IA ^J-r^ t-- IA IA VO R P, ^ s^ w H i-{ H H H 38
  • 40. i mmmm?m?m?s «-Ä^-SRr^S^siäR^si^»^ Ov xo .-) o .: f- t- r- r- t»- t~ rt o CJ irv in a» o» «^ .3 t>- r- vo ir t^- o ^- UN IT» ox o j- so r- vT :-■ r- •- 5 ir in 0 Ji t~- t^- «^ l^ H■ r•t rli iH Ä^SÄÄ^^S^^^^sj^S^«ITV 3 ao s H 3 00 rt CO CO CO CO «^ o r- Q o OD O »A S% iA g- t^- cj w iÄ t^ vö "^ l/ r- J- KN CVJ -» ^f l/N CVJ «5 vÖ Öl it t^ 00 Ö H ^r in vo <ö ö H ÖOOOOO i ?ft?§g?^«SSgg^5»gS^^^^ W H <-( rH H H co r-o mcopü-3tA»Hir>cj (VI t- CJ (U (O H ^1 ?1 •-=c• -» c O -H en t- IO m vo K H H Hi T> «"» (A . "ÄÄWW^ftlirvONVOCÄU5VDiÄÄAxAJin.X.X it V^!:f.•••••• ox H 3 XO o CVJ H t-oo q t--co-* oxvo^- H H CVI H H OX H XO XD H H ■5CVJ H"^ ^(M t- t~ co XO c^ OX ^t CO OJ CVJ CVJ a EH .^SlSÄSK^^^^^ «3 ^ S< ■^ CVI J- m oo 1A xo y :> «> ^' <g S ^ © S Ö ^ H H H H H H H H H CO CVJ O 3 cvjtcxHiAajo-*-*o ■# OS IT» Pv S -^ H H & 9 pj d K? P! Ö&J üHBHBH^SH i&xio 39
  • 41. TABLE'VIII - SATELLITE PASSES AND CORRELATED FIATS Number of Satellite Number of Identification Fls No. ; Period Examined Passes in Period Correlations» of Correlations 20 22-26 Jul 59 11 0 21 15-17 Sep 59 15 5 58 Delta 2 (2) 59 Epsilon 1 (5 22 15-21 Dec 59 6 5 58 Delta 2 (5) 25 12-16 Jan 60 6 k 58 Delta 2 (k) 2k 51 Mar-6 Apr 60 6 2 58 Delta 2 (l), 60 Beta 1 (l) 25 6-10 Jun 60 10 • - 1 60 Epsilon 2 (1) * Correlation denotes a minimum of two flats occurring in the period from 10 minutes before pass time, until 20 minutes after pass time. ho
  • 42. and a distribution characterized by email, compact groups separated by long periods of little or no activity. Such a distribution might Indicate that these flats were caused by a distinct event, ouch as the movement of a satellite or meteor shower. To examine the relationship between satellite altitude and flats, a tabulation was made of all flats occurring in a 50-minute period* In the vicinity of each of the underlined satellite passes in Figures 20-25. These data are presented in Table DC. Regarding the effect of satellite altitude on the formation of flats, It is noted that of the 6? satellite reflections recorded by the DOPLOC center antenna, 1? (or 2556) show evidence of flats near the satellite pass time (see Table l). These 1? satellite passes have an average altitude of l8h miles. It cannot be concluded from these data, however, that flats are more frequently associated with the lower altitude satellites, since the average altitude of all the center antenna satellite reflections is only 201 miles. The range limitations of the interim DOPLOC system made reception of the higher altitude passes marginal and, consequently, the satellite reflections that were received were from the lower altitude passes. In Figures 20-25, however, there are a total of 52 satellite passes charted, ranging in altitude from 95 to 658 miles. These passes represent all of the satellite crossings that were predicted for the DOPLOC system during these periods. Of these 52 passes, 1? (or 555t) show evidence of several flats near satellite pass time and the average altitude of these 17 satellite passes is 552 miles (see Table IX). It should be pointed out that the limitations of the DOPLOC system do not apply here, since we are concerned only with observations of flats, as opposed to flats and satellites. Since flats are assumed to be considerably larger than the associated satellite, it is felt that reflections would be obtained from flats at high altitudes even though no reflection would be received from the satellite itself. * i^rom 10 minutes before pass time until 20 minutes after pass time. ' hi
  • 43. ■ Comparison of the data In Tables I and IX Indicates that formation of flats Is apparently not entirely dependent on altitude, since by more than tripling the altitude range of the data examined, the flats observed only increased by approximately 836. Based on these data, it would appear that flats may be observed almost aa frequently associated with satellltea at low altitudes as at high altitudes. k2 ...,.ij^..-.i-^^ ■■—^v.
  • 44. TABLE IX - SATELLITE AlfTITUDE VS NUMBER GF FIATS .■ Date Satellite Altitude Miles Number of Flat8# in 30-Mln. Period Ik Sep 59 58 Delta 2 UJO 2 17 Sep 59 58 Delta 2 658 5 15 Dec 59 58 Delta 2 U92 6 16 Dec 59 58 Delta 2 U85 7 17 Dec 59 58 Delta 2 1*82 12 18 Dec 59 58 Delta 2 U78 5 21 Dec 59 58 Delta 2 19k It 12 Jon 60 58 Delta 2 MO 5 15 Jan 60 58 Delta 2 186 7 Ih Jan 60 58 Delta 2 186 2 16 Jan 60 58 Delta 2 l»01 11 k Apr 60 58 Delta 2 95 2 15 Sep 59 59 Epsilon 2 210 1* 111 Sep 59 59 Epsilon 2 Xhl 3 16 Sep 59 59 Epsilon 2 IkO 2 5 Apr 60 60 Beta 1 451 10 6 Jun 60 60 Epsilon 2 201 5 Average 532 *From 10 minutes before pass time until 20 minutes after pass time« hi
  • 45. C. Meteor-Induced lonlzatiou Reflections from meteor trails may account for some of the flats observed, particularly in the December and June samples (Figures 22 and 25). The Ursid meteor shower normally occurs during the period 17-24 December with the maximum activity on 22 December. During this maximum, a radio-observed rate of 15 meteors/hour has been reported.10 Similarly, the daytime Arietid and daytime Perseid showers reach their maximum on 8 June and 9 June, respectively, which would place them in the interval charted in Figure 25. For these showers, the maximum hourly radio-observed meteor rate is 66 and k2, respectively. A meteor passing through the ionosphere forms Initially a large, cylindrical, ionized column, and maximum reflection or signal scattering is experienced when the incident wave is normal to the long axis of the cylinder. The passage of a great number of meteors (as in a shower) could quite conceivably form many large, ionized columns which, upon diffusion, would overlap and effectively blanket a considerable area with a slow moving ionized cloud. From a cloud of this type having a reasonably uniform density, we might expect to observe a single, con-tinuous, long duration flat with a strong signal level. However, if the cloud was patchy and non-uniform, then the reflections received might be intermittent, with shorter durations and varying signal strengths. kk
  • 46. V. CONCLUSIONS Baaed on the data presented in this report, several conclusions appear rather firm. First, when a flat Is observed In connection with a known satellite passage, the signal level received from the flat Is usually stronger than the signal level received from the associated satellite. This would Indicate that the dimensions of the reflecting mass are comparable to or larger than those of the satellite. Secondly, satellite passage cannot be accurately determined by merely charting the occurrence of flats against a time reference. The appearance of a large number erf flats in a short time Is not a reliable indication that a satellite has passed, evidenced by the data presented in Figures 22-24. Attention is called to the many groups of flats, not associated with a satellite crossing, which appear very similar to those groups of flats observed in the vicinity of a satellite pass. Thirdly, satellite altitude does not appear to be a factor In the foimatlon or detection of flats. The DOPLOC system recorded flats associated with satellites at various altitudes, ranging from 110 miles to more than 600 miles. HAHOLD T. LOOTENS ^ :' ■ ■
  • 47. REFERENCES 1* ?! tey*1" <*•, Richard, V. W., Hodge, A. H., Pattoa, R. B., Adems, C. L. First Semi-Annual Technical Summary Report, Il850(l959)ly 1958 " 51 December 1958- mL Me,no ReP01"* No- 2. de Bey, L. G., Richard, V. W., Fatten, R. B. Second Semi- Annual Technical Summary Report, Period 1 January 1959 - TO June 1959. BRL Memo Report No. 1220 (1959). 5. de Bey, L. G. Third Technical Summary Report, Period 1 July 19^9 - 50 June i960. BRL Memo Report No. 128? (i960). Hodge, A. H. Final Summary P-nort on the BRL-D0PL0C Prelect. BRL Report No. I.I56 (1961). k. 5. Kraus, J. Evidence of Satellite-Induced lonization Between Hemispheres. Proc. IRE, hQ, 1913-1911+ (i960). 6. Kraus, J., Higgy, R. The Relation of the Satellite lonization Phenomenon to the Radiation Belts. Proc. IRE, 1*8, 2027-2028 7. Kraus, J., Higgy, R., Crone, W. The Satellite lonization Phenomenon. Proc. IRE, 1+8, 672-78 (i960). 8' ^nk-%L' V^6 of Variation of the Signal Strength from 1958 uelta 2 (Sputnik 5). Nature, 185, I385-I384 (1959). 9. Adams, C. L. The DOPLOC Instrumentation System for Satellite Tracking. BRL Report No. 1125 (1961). 10. Whipple, F. L. Smithsonian Institution Astrophysical Observatory Oorrespondence with author dated 25 May 1961. k6 ^;^,^.v:i^!.:^:-:i:^^.-::^:-L:^-;;y;j:.;..i;.,1^L,;i,(^^^ ._ _
  • 48. VII. BIBLIOGRAPHY Coova., Sao Ma8o, cISÄ^.^"^.^^: ^i^?- Feb 196x7 ^put,liJt ni> ,,,ade " Klruoa Oeophyalcal Observatory," ^ wT$Th*-£$r& %4:^ "Iteai0 E"e«1°" " «laat Satemtea," 9' In VZiX» "Ä ^strr f,3^"oä by tbeir mnuaaoe Colorado, Del ijeö. *' pre8ented " Joint UHSI-IBE Meeting, BouUer, l»7
  • 49. APPENDIX I BRL-DOPLOC REPORTS No. 1 BRL Memo Report No. 1055 - October 1958 v?>?Plpr l1**?* ^AnteQna Orientation for a Doppier ßyßtem" by L. P. Bolgiano, Jr., CONFIDENTIAL J' " No. 2 BRL Memo Report No. II85 - January I959 First Semi-Annual Technical Summary Report Period 1 July 1958 - 31 December I958 by L. G. deBey, V. W. Richard, A, H. Hodae R. B Pa+ton n T A^ » (BML 59-60) CONFIDENTIAL ' tt0n, ^ L- *****•' No, 5 BRL Tech Note No. 1265 - June 1959 "Orbital Data Handling and Presentation" by R. E. A. Putnam., UNCIASSIFIED No. 4 BRL Tech Note No. 1266 - July 1959 "An Approach to the Doppler Dark Satellite Detection Problem" by L. G. deBey., CONFIDENTIAL No. 5 BRL Memo Report No. 1220 - July 1959 Second Semi-Annual Technical Summary Report Period 1 January - 30 June 1959 by L. G. deBey, V. W. Richard and R. B. Patton., (BML 208-59) CONFIDENTIAL No. 6 BRL Teqh Nate N0..I278 - September 1959 "Synchronization of Tracking Antennas" by R. E. A. Putnam., UNCIASSIFIED No. 7 BRL Memo Report No. 1237 - September I959 A Method of Solution for the Determination of Satellite Orbital Parameters from DOPLOC Measurements" vrui^aj. by R. B. Patton, Jr., UNCIASSIFIED No, 8 BRL Memo Report No. IO93 - March i960 "The Dynamic Characteristics of Phase-Lock Receivers" by Dr. Keats Pullen., UNCLASSIFIED No. 9 "Station Geometry Studies for the DOPLOC System"' Stanford Research Institute., UNCIASSIFIED N0' 10 "^^em^esS^^^^ ^"^ " ^ ^ by W. E. Scharfman, H. Rothman, H. Guthart, T, Morlta., UNCLASSIFIED No. 11 Philco Corporation - h May i960 "Polystation Doppler System", UNCLASSIFIED k9
  • 50. BRL-DOPLOC REPORTS (cont'd) No. 12 Space Science Laboratory, General Electric Co. - October i960 "Orbit Determination of a Non-Transmitting Satellite Using Doppler Tracking Data" by Dr. Paul B. Richards., UNCLASSIFIED No. 13 Fined Technical Report - University of Delaware - June 15, i960 "Quantum Mechanical Analysis of Radio Frequency Radiation" by L. P. Bolgiano, Jr. and W. M. Gottschalk., UNCIASSIPIED No. Ik Final Report F/157, Columbia University - February 11, i960 "Summary of the Preliminary Study of the Applicability of the Ordir System Techniques to the Tracking of Passive Satellites", UNCIASSIFIED No. 15 BRL Report No. 1110 - June i960 "Precision Frequency Measurement of Noisy Doppler Signals" by W. A. Dean., UNCIASSIPIED No. l6 Third Technical Summary Report - Period July 1959 through June JO, i960 BRL Memo Report No. 1287 by A. L. G. deBey., UNCLASSIFIED No. 17 Columbia University Tech. Report No. T-l/157 - August 1, 1959 "The Theory of Phase Synchronization of Oscillators with Application to the DOPLOC Tracking Filter" by E. Kreindler., UNCIASSIPIED No. 18 BRL Tech Note No. I3I+5 - August i960 "DOPLOC Receiver for Use with Circulating Memory Filter" by K. Patterson., UNCIASSIPIED No. 19 BRL Tech Note No. 155^ - October i960 "Parametric Pre-Amplifier Results" by K. Patterson., UNCIASSIPIED No. 20 BRL Tech Note No. I367 - December i960 "Data Generation and Handling for Scanning DOPLOC System" by Ralph E. A. Putnam No. 21 BRL Report No. 1125 - January 1961 "The DOPLOC Instrumentation System for Satellite Tracking" by C. L. Adams., UNCIASSIPIED No. 22 BRL Memo Report No. I55O - March 1961 "DOPING Observations of Reflection Cross Sections of Satellites" by H, T. Lootens., UNCIASSIPIED No. 23 BRL Memo Report No. 1362 - August I96I "Satellite-Induced lonlzatlon Observed With the DOPLOC System" by H. T. Lootens., UNCIASSIPIED 50 ■. . , ■ ■ ■ . ; . ■ V:- . ■ '. ■ ■ ■ ■ ■ •■■.■■■■■■■
  • 51. BRL-DOPLOC BEPORTS (cont'd) In Preparation No. 2k "DOPLOC Comb yliter" by R. Vltek No. 25 "Final Summary Report on the BRL-DOPLOC Project" by Dr. A. H. Hodge 51
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  • 80. HlON3dlS HVNOIS MBO 00 r- N P S 0) ADN3n03dJ d3~lddOQ ssnoAOonix o 11 I II indino M3AI303d IV N/S hl M0138 80 < -1 tf> (/) z h-' < b. b. X O < o O » rsi H O >- i- < UJ V) OC H o UJ _J CL «0 Ul Z oc UJ 4 bi o: cc P Ü O UJ tr CM -SOUT , 29 o b. a. I M o CD N UJ -1 H v4 5 u m Z o o> S U> i » -1 (T> r- < Q. ro o > in O zs o UJ ^ »- -1 < s3 UJ o3 z< x CD ■1 Ü < K UJ IU -J O cr Q S < z 00 < ID 86
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  • 85. DISTRIBUTION LIST No. of Copies 10 10 Organization Chief of Ordnance ATTN: ORDTB - Bal Sec Department of the Army Washington 25, D. C. Commanding Officer Diamond Ordnance Fuze Laboratories ATTN: Technical Information Office Branch 012 Washington 25, D. C. Commander Armed Services Technical Information Agency ATTN: TIPCR Arlington Hall Station Arlington 12, Virginia Commander Air Force Systems Command ATTN: SCTS Andrews Air Force Base Washington 25, D. C. Commander Electronic Systems Division L. Q. Hanacom Field Bedford Massachusetts Comraander Air Proving Ground Center ATTN: PGAPI Eglin Air Force Base, Florida Army Research Office Arlington Hall Station ATTN: Mrs. F. Whedon Arlington, Virginia No. of Copies Organization Commanding Officer U. S. Army Communications Agency The Pentagon Washington 25, D. C. Commanding General White Sands Annex - BRL White Sands Missile Range New Mexico Commanding General Army Ballistic Missile Agency ATTN: Dr. C. A. Lundqulst Dr. F. A. Speer Redstone Arsenal, Alabama Director Advanced Research Projects Agency Department of Defense Washington 25, D. C. Director National Aeronautics & Space Administration 1520 H Street, N.W. Washington 25, D. C. Chief of Staff, U. S. Army Research and Development Division Director/Special Weapons-Missile and Space Division Washington 25, D. 0. Office Chief Signal Officer Department of the Army Research and Development Division Washington 25, D. C. 91
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