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Polarimetric radar signal mapping process

  • US 5,313,210 A
  • Filed: 02/23/1993
  • Issued: 05/17/1994
  • Est. Priority Date: 02/23/1993
  • Status: Expired due to Fees
First Claim
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1. A process for obtaining information regarding a region of interest comprising the steps of:

  • transmitting a first polarized polarimetric signal toward a first region using a first channel transmission means;

    receiving a first scattering signal of the first polarized polarimetric signal scattered from within a plurality of subregions of the first region, for each subregion, the first scattering signal having a first polarimetric signal portion, B1, received by a first channel receiving means, and having a second polarimetric signal portion, B2, received by a second channel receiving means;

    transmitting a second polarized polarimetric signal, distinct from said first polarized polarimetric signal, toward the first region using a second channel transmission means;

    receiving a second scattering signal of the second polarized polarimetric signal scattered from each of the plurality of subregions, for each subregion, the second scattering signal having a third polarimetric signal portion, B3, received by a third channel receiving means, and having a fourth polarimetric signal portion, B4, received by a fourth channel receiving means;

    generating a plurality of pixels, each said pixel including data corresponding to a subregion of said plurality of subregions, each said pixel generated using data corresponding with at least one collection of said signal portions B1, 1≦

    i≦

    4, where each Bi includes signals scattered from the subregion corresponding to the pixel;

    selecting a sample collection of the plurality of pixels;

    determining statistical expectation values representing entries of a predetermined expectation matrix using the data of at least one pixel from said sample collection;

    obtaining values for one or more signal calibration variables by solving substantially simultaneously a first plurality of real valued equations for the values of a plurality of real unknowns corresponding to the real and imaginary portions of said plurality of signal calibration variables, said first plurality of real valued equations including a plurality of expectation equations, each expectation equation obtained by equating one of said expectation values, determined in said step of determining, to a theoretical expansion of the corresponding entry in the predetermined expectation matrix, said calibration variables relating to;

    (1) corresponding zero or more channel imbalances between;

    (a) said first channel transmission means and said second channel transmission means when transmitting said first polarized polarimetric signal and said second polarized polarimetric signal;

    (b) said first channel receiving means and said second channel receiving means when receiving said first scattering signal;

    (c) said third channel receiving means and said fourth channel receiving means when receiving said second scattering signal; and

    (2) corresponding zero or more cross-talk polarimetric signal distortions between;

    (d) said first channel receiving means and said second channel receiving means when receiving the first scattering signal;

    (e) said third channel receiving means and said fourth channel receiving means when receiving the second scattering signal;

    (f) said first channel transmission means and said second channel transmission means when transmitting the first polarized polarimetric signal;

    (g) said first channel transmission means and said second channel transmission means when transmitting the second polarized polarimetric signal; and

    (3) corresponding to a Faraday rotation angle;

    calibrating one or more pixels using the values for said plurality of the signal calibration variables obtained in said step of obtaining;

    using the calibrated pixels to obtain information regarding the region.

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