software defined radar based on P-18 antenna system

1. VHF software radar
based on P-18 antenna system
Dr. Bertalan Eged*, Benjamin Babják**
*Sagax Communications, Ltd.
Haller u. 11-13. Budapest 1096 Hungary
**Budapest University of Technology and Economics,
1111 Budapest Goldmann Gy. t ér 3.
www.sagax.hu
www.sagax.hu

2. Content
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•
•
•
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The goals of the project
Technological goals
Implementation technology
System configuration
User interfaces
– PP indicator
– Control panel
•
•
Output signal description
Typical signal processing samples
– Pulse compression
– Integration
– DMTI
•
Field trial
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3. The goals of the project
• Experimental search radar equipment for air targets:
–
–
–
low-cross section
low-heigth
unexpectedly occur
• Experimental test system
for measurements
• Using existing antenna
system and platform of P-18
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4. Technological goals
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•
•
•
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Sub-impulse modulated transmitter
Pulse compressed receiver
Semiconductor based
Computer controllable
System integration ready
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5. Radio electronic equipment
Traditional implementation
RF
IF Down
Conversion
IF
Baseband
Down
Conversion
BB
Baseband
Demodulation
and
Processing
Implementation based on Software Defind Radio
Technology
Analog
front-end
RF
technology
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Domain
conversion
A/D és D/A
Conversion
technology
Digital
processing
DSP
technology
MMI/GUI
technology
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6. Implementation levels
Digital
signal
handling
Digital
BB
Digital
IF
Digital
RF
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7. System configuration
3X400V
or
3X220V
Power supply
distributor
P-18
antenna
platform
230V
Antenna connection
Syncronization
interface
Antenna
control
RF
front-end
Antenna position Signal and data Plots
processing
RS-232
RS-232
IP
PPI
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8. Experimental transceiver
Power
Amplifyer
Antenna
T/R
switch
RX
down
converter
Control and power supply
Hardver platform
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DAC
Sub-impulse
modulated
pulse generator
ADC
Pulse
compression
receiver
Reference
oscillator
Low-noise
Amplifyer
Antenna
position
TX
up
converter
Operating
and application
programs
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9. Digital signal processing
Staying
targets
Digitized
IF signal
Digitized Band limited
BB signal integrated
signal
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Compressed
pulses
Moving
targets
CFAR
level
Shots
Targets
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10. Sub-impulse modulation
64us radiated pulse
1us compressed received pulse
80
Impulse Compression
1
Channel
0 .5
0
-0 . 5
-1
0
0 .5
Time
1
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40
20
0
-20
0
1 .5
x 1 0 -3
Sub-impuls
modulated search signal
DSP
technolgy
60
0 .5
Time
1
1 .5
x 1 0 -3
Matched-filter
pulse compressor
1MHz bandwidth
DSP
technology
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11. Compression gain
Receiver IF output:
signal+noise
Output of the matched filter:
SNR improoved
40
21
20
30
signal
19
20
18
17
10
16
0
15
14
0
0.2
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0.4
0.6
time
0.8
1
1.2
-3
x 10
-10
0
0.2
0.4
0.6
time
0.8
1
1.2
-3
x 10
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12. Hardware implementation
PA Power supply
PA
Isolation transformer
Platform
computer
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LNA
Low-level
RF connections
Booster
T/R switch
IF and trigger
connections
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13. Solid-state power amplifier
4X 800W
3200W
4X 200W
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14. Output power measurement
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15. Menu
PP indicator
Icons
Display area
Control area
Status
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16. Control panel
Control
area
A-type
indicator
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17. Automatic trigger changing
320 Hz
500 Hz
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18. Output frequencies
153
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155
157
159
161
163
165
167
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19. Pulse compression: Barker
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20. Pulse compression: MLS
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21. Pulse compression: LFM
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22. Pulse compression: P2
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23. Digital signal processing: CINT=1
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24. Digital signal processing: CINT=10
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25. Digital signal processing: VINT=1
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26. Digital signal processing: VINT=10
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27. Digital signal processing: DMTI
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28. Digital signal processing: DMTI off
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29. Digital signal processing: DMTI on
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30. Results: compressed pulses
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31. Results: moving targets
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32. Results: decision hits
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33. Results: target search
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34. Results: plot generation
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35. Field trials
• NATO RTO SET-078 TG-046
“Multi-Band Radar For Air Defense Systems”
• COSIMA I Trial:
– 2004 October, Medina, Hungary
• COSIMA II Trial:
– 2005 September, Livorno, Italy
*Co-located Simultaneous Multi-band-radar Analysis
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36. COSIMA II site in Italy
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37. COSIMA II deployed radars
MEPHIS (DE)
[10/35/94GHz]
DIMURA (NO) MELISSA (DE)
[5.9GHz]
[238-348MHz]
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MMS-300 (IT)
[2-18GHz]
SRV-P18 (HU) SzT-68UM (HU)
[150-170MHz] [2.8-3.1GHz]
150MHz-94GHz
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38. COSIMA II targets and trajectories
Piper:
Cesna 172
Jet
KingAir 200
Ship
Rosetti
Helikopter
B200
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39. COSIMA II measured plots vs GPS
km
SRV-P18
plots
GPS tracks
km
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40. COSIMA II: SRV-P18 Toszeg vs. C1
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41. Conclusions
• A complete software based radar system
– Digital signal and data processing
– VHF analog front-end with
3KWp solid-state power amplifier
– Interfacing to the existing P-18 antenna system
• Error-free operation during the field trials
• Capability of available technology and
knowledge base in Hungary was
demonstrated
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