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 Capria no_video_ship_detection_with_dvbt_software_defined_passive_radar Presentation Transcript

  • 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
  • Outline
    • Introduction to passive radar
    • DVB-T signals
    • Universal Software Radio Peripheral (USRP) technology
    • Preliminary measurements
    • Passive Radar Experiment
    • Conclusion
    • Future work
  • Passive radar concept Passive radar or Passive Coherent Location ( PCL ) are radar systems that exploit non-cooperative illuminators of opportunity TV
    • Analog TV
    • DVB-T
    Mobile communication
    • GSM
    • UMTS
    Radio
    • AM
    • FM
    • Digital (DAB)
    • Advantages
    • Low cost architectures
    • Low energy requirements
    • Potential null probability of intercept
  • Principle Passive Radar Receiver DVB-T transmitter
    • Reference channel
    • Target channel
  • DVB-T signal
    • • Larger bandwidth (7.61 MHz) with respect to other broadcasting signals (e.g.: FM, GSM, UMTS, DAB)
    • • Wide radar coverage due to the transmitted power levels (tens of km)
    • • COFDM and MPEG guarantee non content dependent signal spectrum
    • • Complete analog TV switch off by 2012
    • ( increasing DVB-T coverage )
      • Two-way data link (max throughput of 32 MBps)
    USRP technology (1/2) 16 cm 16 cm The motherboard includes:
    • ADC/DAC converter
      • 2 ADC
    64 MS/s @ 12 bit
      • 2 DAC
    128 MS/s @ 14 bit
    • FPGA Altera Cyclone
      • Base band conversion
      • Filtering
      • Decimation
    • USB 2.0 Controller (Cypress FX2)
    USRP (Universal Software Radio Peripheral) board (ver. 1)
  • 16 cm 16 cm
      • They can be used simultaneously or separately
    • Daughterboards:
      • Band: from DC to 5.85 GHz
    2 TX and 2 RX http://gnuradio.org/ USRP technology (2/2) USRP (Universal Software Radio Peripheral) board (ver. 1)
  • + 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
  • 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)
  • Passive Radar Experiment Scenario Analysis 32 km 15 km RX TX
  • Passive Radar Experiment Coverage Map 40 km
  • Passive Radar Experiment Doppler Analysis Expected Doppler frequencies for ships departing from the nearby harbour
  • Passive Radar Experiment Experimental Results
  • Experimental Results Integration Time 800 ms Doppler Resolution 1.25Hz
  • 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
  • Conclusion
    • Software Defined Radio (SDR) concept is applicable for implementing radar functionality
    • Experimental results have proven the feasibility of a DVB-T based passive radar system by using a low-cost software defined architecture (USRP)
    • An experimental system has been set up and live data acquired
    • Ships arriving and departing from the nearby harbor have been detected (up to 5 nm)
  • Future work
    • DVB-T passive radar experiments with cooperative targets are planned
    • Moving towards USRP version 2 (100 MS/s @ 14 bit)
    • Speed up Cross Ambiguity Function algorithms
    • Improving range resolution exploiting multiple adjacent DVB-T channels of the same transmitter
    • Feasibility study of a multistatic passive radar configuration
  • Thank you for your attention !