Method and apparatus for detecting multipath interference in a r

Details Method and apparatus for detecting multipath interference in a r Method and apparatus for detecting multipath interference in a r

1996-03-01

1997-12-02

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Determining direction

Low angle processing

342152, 342162, 342194, 342196, G01S 7292

Patent

active

056941315

ABSTRACT:
A method and apparatus for detecting the presence of multipath interference within a radar receiver disposed to form sum (.SIGMA.) and difference (.DELTA.) signals by time-sampling a target return signal is disclosed herein. In accordance with this method there is formed a sequence of complex conjugates (.SIGMA.*) of the sum signals (.SIGMA.). Each of the .SIGMA.* signals is multiplied with an associated one of the .DELTA. signals so as to form a time-sampled sequence of .SIGMA.*.DELTA. signals. A power spectrum representation of the time-sampled sequence of signals .SIGMA.*.DELTA. is then generated, wherein the presence of selected spectral components within the .SIGMA.*.DELTA. power spectrum indicate the existence of multipath interference within the radar receiver. In a particular implementation the .SIGMA.*.DELTA. power spectrum representation is quickly and reliably determined by performing a Fast Fourier Transform (FFT) operation upon the time-sampled sequence of .SIGMA.*.DELTA. signals.

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