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Interference nulling system for antennas

  • US 5,298,908 A
  • Filed: 11/27/1987
  • Issued: 03/29/1994
  • Est. Priority Date: 11/27/1987
  • Status: Expired due to Fees
First Claim
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1. An interference nulling system for antennas comprising:

  • a receiving antenna of the type having a pair of receiving ports for receiving right hand circular polarized signals and left hand circular polarized signals,converter means in said antenna for converting said circular polarized signals at said ports into linear polarized signals,a primary signal channel connected to the receiving port for receiving primarily desired data link signals plus some interference signals,said primary signal channel comprising signal processing means and a summing circuit having an output coupled to a receiver,an interference nulling channel connected to the other receiving port and to said summing circuit for receiving only interference signals and no data link signals and for applying processed interference signals to an input of said summing circuit and for producing an optimized clean desired data link signal output from said summing circuit substantially free of interference signals,said interference nulling channel comprising a power divider, adjustable phase control means and adjustable amplitude control means connected in series,an interference nulling control loop connected between said power divider and said adjustable phase control means and between said power divider and said adjustable amplitude control means having an adaptive controller for adjusting the phase and amplitude of said processed interference signals applied to the input of said summing circuit;

    error detecting means connected in series in said nulling control loop and having an error signal output connected to said adaptive controller, andprimary signal channel sampling means coupled to the output of said summing circuit and to an input of said error detecting means for generating an error signal output from said error detecting means which is applied as an input to said adaptive controller indicative of the phase and amplitude of said interference signal in said primary signal channel.

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