Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar

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Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar

  1. 1. Ship Detection with DVB-T Software Defined Passive Radar A. Capria * , M. Conti # , D. Petri # , M. Martorella # , F. Berizzi # , E. Dalle Mese # , R. Soleti † , V. Carulli † * RaSS Center – CNIT # Dept. of Information Engineering – University of Pisa † Italian Navy – CSSN ITE G. Vallauri
  2. 2. Outline <ul><li>Introduction to passive radar </li></ul><ul><li>DVB-T signals </li></ul><ul><li>Universal Software Radio Peripheral (USRP) technology </li></ul><ul><li>Preliminary measurements </li></ul><ul><li>Passive Radar Experiment </li></ul><ul><li>Conclusion </li></ul><ul><li>Future work </li></ul>
  3. 3. Passive radar concept Passive radar or Passive Coherent Location ( PCL ) are radar systems that exploit non-cooperative illuminators of opportunity TV <ul><li>Analog TV </li></ul><ul><li>DVB-T </li></ul>Mobile communication <ul><li>GSM </li></ul><ul><li>UMTS </li></ul>Radio <ul><li>AM </li></ul><ul><li>FM </li></ul><ul><li>Digital (DAB) </li></ul><ul><li>Advantages </li></ul><ul><li>Low cost architectures </li></ul><ul><li>Low energy requirements </li></ul><ul><li>Potential null probability of intercept </li></ul>
  4. 4. Principle Passive Radar Receiver DVB-T transmitter <ul><li>Reference channel </li></ul><ul><li>Target channel </li></ul>
  5. 5. DVB-T signal <ul><li>• Larger bandwidth (7.61 MHz) with respect to other broadcasting signals (e.g.: FM, GSM, UMTS, DAB) </li></ul><ul><li>• Wide radar coverage due to the transmitted power levels (tens of km) </li></ul><ul><li>• COFDM and MPEG guarantee non content dependent signal spectrum </li></ul><ul><li>• Complete analog TV switch off by 2012 </li></ul><ul><li>( increasing DVB-T coverage ) </li></ul>
  6. 6. <ul><ul><li>Two-way data link (max throughput of 32 MBps) </li></ul></ul>USRP technology (1/2) 16 cm 16 cm The motherboard includes: <ul><li>ADC/DAC converter </li></ul><ul><ul><li>2 ADC </li></ul></ul>64 MS/s @ 12 bit <ul><ul><li>2 DAC </li></ul></ul>128 MS/s @ 14 bit <ul><li>FPGA Altera Cyclone </li></ul><ul><ul><li>Base band conversion </li></ul></ul><ul><ul><li>Filtering </li></ul></ul><ul><ul><li>Decimation </li></ul></ul><ul><li>USB 2.0 Controller (Cypress FX2) </li></ul>USRP (Universal Software Radio Peripheral) board (ver. 1)
  7. 7. 16 cm 16 cm <ul><ul><li>They can be used simultaneously or separately </li></ul></ul><ul><li>Daughterboards: </li></ul><ul><ul><li>Band: from DC to 5.85 GHz </li></ul></ul>2 TX and 2 RX http://gnuradio.org/ USRP technology (2/2) USRP (Universal Software Radio Peripheral) board (ver. 1)
  8. 8. + Preliminary measurements (1/2) Linux PC USB 2.0 UHF Antenna USRP DBSRX (800-2400 MHz) DVB-T f 0 =818 MHz f s =8 MHz
  9. 9. Preliminary measurements (2/2) Signal acquisition and ambiguity function evaluation DVB-T DVB-T Range Profile Ambiguity Function DVB-T Doppler Profile Ambiguity Function T=298 μ s ( ≈ 44 km)
  10. 10. Passive Radar Experiment Scenario Analysis 32 km 15 km RX TX
  11. 11. Passive Radar Experiment Coverage Map 40 km
  12. 12. Passive Radar Experiment Doppler Analysis Expected Doppler frequencies for ships departing from the nearby harbour
  13. 13. Passive Radar Experiment Experimental Results
  14. 14. Experimental Results Integration Time 800 ms Doppler Resolution 1.25Hz
  15. 15. Experimental Results Range = 2.009 nm f D = -32.42 Hz (about 6.5 kts) Range = 2.096 nm f D = -32.42 Hz (about 6.5 kts) D
  16. 16. Conclusion <ul><li>Software Defined Radio (SDR) concept is applicable for implementing radar functionality </li></ul><ul><li>Experimental results have proven the feasibility of a DVB-T based passive radar system by using a low-cost software defined architecture (USRP) </li></ul><ul><li>An experimental system has been set up and live data acquired </li></ul><ul><li>Ships arriving and departing from the nearby harbor have been detected (up to 5 nm) </li></ul>
  17. 17. Future work <ul><li>DVB-T passive radar experiments with cooperative targets are planned </li></ul><ul><li>Moving towards USRP version 2 (100 MS/s @ 14 bit) </li></ul><ul><li>Speed up Cross Ambiguity Function algorithms </li></ul><ul><li>Improving range resolution exploiting multiple adjacent DVB-T channels of the same transmitter </li></ul><ul><li>Feasibility study of a multistatic passive radar configuration </li></ul>
  18. 18. Thank you for your attention !

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