VHF software radar
based on P-18 antenna system
Dr. Bertalan Eged*, Benjamin Babják**
*Sagax Communications, Ltd.
Haller u...
Content
•
•
•
•
•

The goals of the project
Technological goals
Implementation technology
System configuration
User interf...
The goals of the project
• Experimental search radar equipment for air targets:
–
–
–

low-cross section
low-heigth
unexpe...
Technological goals
•
•
•
•
•

Sub-impulse modulated transmitter
Pulse compressed receiver
Semiconductor based
Computer co...
Radio electronic equipment
Traditional implementation
RF

IF Down
Conversion

IF

Baseband
Down
Conversion

BB

Baseband
D...
Implementation levels
Digital
signal
handling

Digital
BB

Digital
IF

Digital
RF

www.sagax.hu

6
System configuration
3X400V
or
3X220V

Power supply
distributor

P-18
antenna
platform

230V

Antenna connection
Syncroniz...
Experimental transceiver
Power
Amplifyer

Antenna

T/R
switch

RX
down
converter

Control and power supply
Hardver platfor...
Digital signal processing
Staying
targets

Digitized
IF signal

Digitized Band limited
BB signal integrated
signal

www.sa...
Sub-impulse modulation
64us radiated pulse

1us compressed received pulse
80

Impulse Compression

1

Channel

0 .5

0

-0...
Compression gain
Receiver IF output:
signal+noise

Output of the matched filter:
SNR improoved
40

21
20

30

signal

19
2...
Hardware implementation
PA Power supply

PA

Isolation transformer

Platform
computer

www.sagax.hu

LNA

Low-level
RF con...
Solid-state power amplifier
4X 800W

3200W

4X 200W

www.sagax.hu

13
Output power measurement

www.sagax.hu

14
Menu

PP indicator

Icons

Display area

Control area

Status

www.sagax.hu

15
Control panel

Control
area

A-type
indicator

www.sagax.hu

16
Automatic trigger changing
320 Hz
500 Hz

www.sagax.hu

17
Output frequencies
153

www.sagax.hu

155

157

159

161

163

165

167

18
Pulse compression: Barker

www.sagax.hu

19
Pulse compression: MLS

www.sagax.hu

20
Pulse compression: LFM

www.sagax.hu

21
Pulse compression: P2

www.sagax.hu

22
Digital signal processing: CINT=1

www.sagax.hu

23
Digital signal processing: CINT=10

www.sagax.hu

24
Digital signal processing: VINT=1

www.sagax.hu

25
Digital signal processing: VINT=10

www.sagax.hu

26
Digital signal processing: DMTI

www.sagax.hu

27
Digital signal processing: DMTI off

www.sagax.hu

28
Digital signal processing: DMTI on

www.sagax.hu

29
Results: compressed pulses

www.sagax.hu

30
Results: moving targets

www.sagax.hu

31
Results: decision hits

www.sagax.hu

32
Results: target search

www.sagax.hu

33
Results: plot generation

www.sagax.hu

34
Field trials
• NATO RTO SET-078 TG-046
“Multi-Band Radar For Air Defense Systems”

• COSIMA I Trial:
– 2004 October, Medin...
COSIMA II site in Italy

www.sagax.hu

36
COSIMA II deployed radars

MEPHIS (DE)
[10/35/94GHz]

DIMURA (NO) MELISSA (DE)
[5.9GHz]
[238-348MHz]

www.sagax.hu

MMS-30...
COSIMA II targets and trajectories
Piper:
Cesna 172

Jet
KingAir 200
Ship
Rosetti

Helikopter
B200
www.sagax.hu

38
COSIMA II measured plots vs GPS

km

SRV-P18
plots

GPS tracks

km
www.sagax.hu

39
COSIMA II: SRV-P18 Toszeg vs. C1

www.sagax.hu

40
Conclusions
• A complete software based radar system
– Digital signal and data processing
– VHF analog front-end with
3KWp...
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Srv p18-intro-v30

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software defined radar based on P-18 antenna system

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Srv p18-intro-v30

  1. 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. 2. Content • • • • • 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 www.sagax.hu 2
  3. 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 www.sagax.hu 3
  4. 4. Technological goals • • • • • Sub-impulse modulated transmitter Pulse compressed receiver Semiconductor based Computer controllable System integration ready www.sagax.hu 4
  5. 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 www.sagax.hu Domain conversion A/D és D/A Conversion technology Digital processing DSP technology MMI/GUI technology 5
  6. 6. Implementation levels Digital signal handling Digital BB Digital IF Digital RF www.sagax.hu 6
  7. 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 www.sagax.hu 7
  8. 8. Experimental transceiver Power Amplifyer Antenna T/R switch RX down converter Control and power supply Hardver platform www.sagax.hu DAC Sub-impulse modulated pulse generator ADC Pulse compression receiver Reference oscillator Low-noise Amplifyer Antenna position TX up converter Operating and application programs 8
  9. 9. Digital signal processing Staying targets Digitized IF signal Digitized Band limited BB signal integrated signal www.sagax.hu Compressed pulses Moving targets CFAR level Shots Targets 9
  10. 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 www.sagax.hu 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 10
  11. 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 www.sagax.hu 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 11
  12. 12. Hardware implementation PA Power supply PA Isolation transformer Platform computer www.sagax.hu LNA Low-level RF connections Booster T/R switch IF and trigger connections 12
  13. 13. Solid-state power amplifier 4X 800W 3200W 4X 200W www.sagax.hu 13
  14. 14. Output power measurement www.sagax.hu 14
  15. 15. Menu PP indicator Icons Display area Control area Status www.sagax.hu 15
  16. 16. Control panel Control area A-type indicator www.sagax.hu 16
  17. 17. Automatic trigger changing 320 Hz 500 Hz www.sagax.hu 17
  18. 18. Output frequencies 153 www.sagax.hu 155 157 159 161 163 165 167 18
  19. 19. Pulse compression: Barker www.sagax.hu 19
  20. 20. Pulse compression: MLS www.sagax.hu 20
  21. 21. Pulse compression: LFM www.sagax.hu 21
  22. 22. Pulse compression: P2 www.sagax.hu 22
  23. 23. Digital signal processing: CINT=1 www.sagax.hu 23
  24. 24. Digital signal processing: CINT=10 www.sagax.hu 24
  25. 25. Digital signal processing: VINT=1 www.sagax.hu 25
  26. 26. Digital signal processing: VINT=10 www.sagax.hu 26
  27. 27. Digital signal processing: DMTI www.sagax.hu 27
  28. 28. Digital signal processing: DMTI off www.sagax.hu 28
  29. 29. Digital signal processing: DMTI on www.sagax.hu 29
  30. 30. Results: compressed pulses www.sagax.hu 30
  31. 31. Results: moving targets www.sagax.hu 31
  32. 32. Results: decision hits www.sagax.hu 32
  33. 33. Results: target search www.sagax.hu 33
  34. 34. Results: plot generation www.sagax.hu 34
  35. 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 www.sagax.hu 35
  36. 36. COSIMA II site in Italy www.sagax.hu 36
  37. 37. COSIMA II deployed radars MEPHIS (DE) [10/35/94GHz] DIMURA (NO) MELISSA (DE) [5.9GHz] [238-348MHz] www.sagax.hu MMS-300 (IT) [2-18GHz] SRV-P18 (HU) SzT-68UM (HU) [150-170MHz] [2.8-3.1GHz] 150MHz-94GHz 37
  38. 38. COSIMA II targets and trajectories Piper: Cesna 172 Jet KingAir 200 Ship Rosetti Helikopter B200 www.sagax.hu 38
  39. 39. COSIMA II measured plots vs GPS km SRV-P18 plots GPS tracks km www.sagax.hu 39
  40. 40. COSIMA II: SRV-P18 Toszeg vs. C1 www.sagax.hu 40
  41. 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 www.sagax.hu 41

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