Srv p18-intro-v30
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software defined radar based on P-18 antenna system

software defined radar based on P-18 antenna system

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  • 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 • • • • • 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. 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. Technological goals • • • • • Sub-impulse modulated transmitter Pulse compressed receiver Semiconductor based Computer controllable System integration ready www.sagax.hu 4
  • 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. Implementation levels Digital signal handling Digital BB Digital IF Digital RF www.sagax.hu 6
  • 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. 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. 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. 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. 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. 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. Solid-state power amplifier 4X 800W 3200W 4X 200W www.sagax.hu 13
  • 14. Output power measurement www.sagax.hu 14
  • 15. Menu PP indicator Icons Display area Control area Status www.sagax.hu 15
  • 16. Control panel Control area A-type indicator www.sagax.hu 16
  • 17. Automatic trigger changing 320 Hz 500 Hz www.sagax.hu 17
  • 18. Output frequencies 153 www.sagax.hu 155 157 159 161 163 165 167 18
  • 19. Pulse compression: Barker www.sagax.hu 19
  • 20. Pulse compression: MLS www.sagax.hu 20
  • 21. Pulse compression: LFM www.sagax.hu 21
  • 22. Pulse compression: P2 www.sagax.hu 22
  • 23. Digital signal processing: CINT=1 www.sagax.hu 23
  • 24. Digital signal processing: CINT=10 www.sagax.hu 24
  • 25. Digital signal processing: VINT=1 www.sagax.hu 25
  • 26. Digital signal processing: VINT=10 www.sagax.hu 26
  • 27. Digital signal processing: DMTI www.sagax.hu 27
  • 28. Digital signal processing: DMTI off www.sagax.hu 28
  • 29. Digital signal processing: DMTI on www.sagax.hu 29
  • 30. Results: compressed pulses www.sagax.hu 30
  • 31. Results: moving targets www.sagax.hu 31
  • 32. Results: decision hits www.sagax.hu 32
  • 33. Results: target search www.sagax.hu 33
  • 34. Results: plot generation www.sagax.hu 34
  • 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. COSIMA II site in Italy www.sagax.hu 36
  • 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. COSIMA II targets and trajectories Piper: Cesna 172 Jet KingAir 200 Ship Rosetti Helikopter B200 www.sagax.hu 38
  • 39. COSIMA II measured plots vs GPS km SRV-P18 plots GPS tracks km www.sagax.hu 39
  • 40. COSIMA II: SRV-P18 Toszeg vs. C1 www.sagax.hu 40
  • 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