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 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar
 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

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  • 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. 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. 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. Principle Passive Radar Receiver DVB-T transmitter <ul><li>Reference channel </li></ul><ul><li>Target channel </li></ul>
  • 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. <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. 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. + 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. 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. Passive Radar Experiment Scenario Analysis 32 km 15 km RX TX
  • 11. Passive Radar Experiment Coverage Map 40 km
  • 12. Passive Radar Experiment Doppler Analysis Expected Doppler frequencies for ships departing from the nearby harbour
  • 13. Passive Radar Experiment Experimental Results
  • 14. Experimental Results Integration Time 800 ms Doppler Resolution 1.25Hz
  • 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. 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. 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. Thank you for your attention !

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