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Non-linear dynamic filtering device for the angular measuring of noise in a radar

  • US 4,345,252 A
  • Filed: 02/07/1980
  • Issued: 08/17/1982
  • Est. Priority Date: 02/13/1979
  • Status: Expired due to Term
First Claim
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1. A circuit arrangement for improving the accuracy of angular measurements in an echo-type target-locating system with a first reception channel emitting a sum signal Σ

  • , a second reception channel emitting a difference signal Δ

    , and circuitry connected to said reception channels for deriving therefrom an angular-deviation signal ε and

    a quadrature deviation signal ε

    q respectively appearing on a first and a second output thereof, comprising;

    first calculating means connected to said first reception channel and to said second output for generating a weighting function P(t) under the control of said sum signal Σ and

    said quadrature deviation signal ε

    q, said weighting function P(t) going to zero during periods in which the sum signal Σ

    is low and the quadrature deviation signal ε

    q is peaking;

    second calculating means in cascade with said first calculating means for establishing a gain-control signal K(t) varying with said weighting function P(t); and

    dynamic filter means connected to said second calculating means and to said first output for processing said angular-deviation signal ε

    by multiplying same with said gain-control signal K(t) and subjecting the product to recursive filtering.

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