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Moving multi-polarization multi-transmitter/receiver ground penetrating radar system and signal processing for buried target detection

  • US 9,395,437 B2
  • Filed: 06/06/2013
  • Issued: 07/19/2016
  • Est. Priority Date: 06/06/2013
  • Status: Expired due to Fees
First Claim
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1. A method of standoff detection for surface and buried targets in or on the road side of a ground vehicle using RF impulse signal, the method comprising the steps of:

  • transmitting a sequence of RF impulse signals by using at least one impulse generator paired with a respective transmit antenna while the vehicle moves forward on the road, said transmit antenna being placed at the center of an antenna frame in either horizontal or vertical polarization, the antenna frame being mounted on an articulable telescope boom of the vehicle to enable the radar to be configured for different scanning modes;

    receiving the return of impulse RF signals using an array of Vivaldi notch antennas, each regularly disposed as either horizontal or vertical polarization with respect to the antenna frame;

    converting the impulse signals received from the Vivaldi notch antennas in analog format to digital format using a digitizer to digitize the analog signal as radar data;

    interleaving the converted radar data with header and trailer to incorporate GPS information with the radar data;

    processing the stream of radar data along with the GPS information to produce radar images for storage in computer memory as multi-transmitter/receiver channel images; and

    calibration of said multi-transmitter/receiver channel images based on;

    a system model for uncalibrated reconstructed images in a multi-transmitter and multi-receiver radar on a moving platform, wherein
    ƒ

    lM(xm,yn

    l)=ƒ

    l(xm

    x
    ls,yn

    y
    ls)exp(

    l),where (xls, yls) represents an unknown shift in a spatial domain, and φ

    l is an unknown phase; and

    an iterative correlation-based phase and time-delay estimation algorithm to calibrate multi-transmitter/receiver images using a reference image that is generated from the mean value of the multi-transmitter/receiver images in each iteration.

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