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Method and device for the removal of ambiguity in distance, applied especially to frequency-shift keying continuous-wave radars

  • US 6,023,238 A
  • Filed: 03/27/1998
  • Issued: 02/08/2000
  • Est. Priority Date: 03/28/1997
  • Status: Expired due to Term
First Claim
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1. A method for the removal of ambiguity in distance of a radar, wherein said method computes the distance from the targets detected by the radar by means of several distance estimation functions, the targets being defined as being in the domain of non-ambiguous distances when the distance estimation functions give substantially the same result, and the targets being defined as being in the domain of ambiguous distances when the distance estimation functions give different results, a particular distance estimation function being defined by the following relationship:

  • ##EQU21## dk being the distance estimation function;

    c being the velocity of light;

    uk =(ri -rj)(rm -rn)* , ri, rj, rm and rn being respectively the signals received in relation to the i, j, m, n order frequency of a transmission frame; and

    "argument" indicating a particular combination of pairs of received frequencieski, kj, km and kn being coefficients defining frequencies Fi, Fj, Fm, Fn of transmission of the frame as follows;

    
    
    space="preserve" listing-type="equation">Fi=F+k.sub.i ν

    .sub.i
    
    
    space="preserve" listing-type="equation">Fj=F+k.sub.j ν

    .sub.j
    
    
    space="preserve" listing-type="equation">Fm=F+k.sub.m ν

    .sub.m
    
    
    space="preserve" listing-type="equation">Fn=F+k.sub.n ν

    .sub.n F being a given base frequency and ν

    i, ν

    j, ν

    m, ν

    n being complementary frequencies that are given.

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