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EXTRACTION OF RELATIVE SIGNALS FROM CLOSELY SPACED TARGETS IN A MONOPULSE SYSTEM

  • US 20100214156A1
  • Filed: 02/26/2009
  • Published: 08/26/2010
  • Est. Priority Date: 02/26/2009
  • Status: Active Grant
First Claim
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1. A method for extracting at least one relative signal parameter representing two closely spaced targets from monopulse scan data, comprising a quadrature angle value and a merged azimuth angle value for each plurality of boresight angles, from a monopulse scanner comprising:

  • comparing a maximum quadrature angle value from the quadrature angle values associated with the plurality of boresight angles with a threshold quadrature value representing a noise level of the monopulse scan data;

    extracting the at least one relative signal parameter according to a cubic polynomial model that is configured to fit the merged azimuth angle values to a cubic function of their corresponding boresight angles to produce a set of polynomial coefficients and determine the at least one relative signal parameter from the set of polynomial coefficients if the maximum quadrature angle fails to exceed the threshold quadrature value; and

    extracting the at least one relative signal parameter according to a linear polynomial model that is configured to fit a function of the merged azimuth angle data associated with each boresight angle and the quadrature angle value associated with the boresight angle to a linear function of an exponential parameter that is an exponential function of the boresight angle to produce a first order coefficient and a constant value and determine the at least one relative signal parameter from the first order coefficient and the constant value if the maximum quadrature angle exceeds the threshold quadrature value.

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