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Universal two-channel STAP filter

  • US 6,563,455 B2
  • Filed: 07/23/2001
  • Issued: 05/13/2003
  • Est. Priority Date: 07/21/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of filtering radar source data comprising distance Doppler matrices X1 and X2 of two receiving channels, by Space-Time Adaptive Processing (STAP), wherein the data of the distance/Doppler matrices X1 and X2 of individual adjacent channels (left/right) as well as of sum and difference signals (Σ



  • ) are processed according to the same procedure, and wherein both computation of filter coefficients α

    (i) and β

    (i), and filtering take place in the frequency domain, said method comprising;

    determining auto-correlations r11 and r22 and cross-correlations r12 of the signals X1 and X2 of both receiving channels, according to the following equations;

    r11

    (i)
    =

    j=1NRG


    X1

    (i,j)
    ·

    X1*

    (i,j)
    r22

    (i)
    =

    j=1NRG


    X2

    (i,j)
    ·

    X2*

    (i,j)
    r12

    (i)
    =

    j=1NRG


    X1

    (i,j)
    ·

    X2*

    (i,j)
    embedded imagewherein X1 (i, j) is a complex range/Doppler matrix of a first of the two channels, X2 (i, j) is a complex range/Doppler matrix of a second of the two channels, NDZ is a number of Doppler cells, NRG is a number of range gates, and 1≦

    i≦

    NDZ;

    determining whether the first channel has the better signal-to-noise ratio according to the following condition max

    (r11

    (i)
    |1

    i

    NDZ
    )


    i=1NDZ


    r11

    (i)
    >

    max

    (r22

    (i)
    |1

    i

    NDZ
    )


    i=1NDZ


    r22

    (i)
    ;

    embedded imageapplying a selection rule which provides that if the first channel has the better signal-to-noise ratio, the filtering coefficients a (i) and b (i) are determined according to

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