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Method of extracting phase errors caused by the atmosphere in the backscatter signal of a coherent imaging radar system carried by a carrier from radar raw data and apparatus for carrying out the method

  • US 5,257,028 A
  • Filed: 07/08/1992
  • Issued: 10/26/1993
  • Est. Priority Date: 07/19/1991
  • Status: Expired due to Fees
First Claim
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1. A method of extracting phase errors caused by the atmosphere in the backscatter signal of a coherent imaging radar system carried by a carrier from radar raw data in whichfor imaging areas with different backscatter ratios over a predetermined period of time successive azimuth spectra are continuously formed anda frequency offset (Δ

  • F(t)) of the backscatter ratio component is obtained by determining the position of the maximum of the correlations between two respective immediately successively formed azimuth spectra,wherein;

    performing a double integration of the difference of the frequency offset (Δ

    F(t)) and a desired value (Δ

    Fsoll) of the frequency offset, the frequency offset desired value (Δ

    Fsoll) being determined either from the carrier forward velocity (Vv) or by a low-pass filtering of the frequency offset (Δ

    F(t)), andstandardizing a result of the double integration by multiplying said result with a constant of (2π



    t) to obtain the phase error (φ

    e (t)).

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