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Method and apparatus for adaptively determining the bearing angle of a radio frequency signal

  • US 5,426,438 A
  • Filed: 12/30/1992
  • Issued: 06/20/1995
  • Est. Priority Date: 12/30/1992
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the bearing angle of a radio frequency (RF) signal comprising:

  • means for commutating between a plurality of RF signal receiving antenna elements to provide a sampled RF signal, the commutating means providing commutation induced phase and amplitude modulation to the RF signal;

    means for modulating the sampled and modulated RF signal to an intermediate frequency (IF) signal, the IF signal including the commutation induced phase and amplitude modulation;

    means for detecting the IF signal;

    means for filtering the IF signal and providing detected frequency modulation (FM), amplitude modulation (AM), single sideband (SSB) and pulsed signals; and

    means responsive to the detecting means for removing the commutation induced phase and amplitude modulation from the IF signal whereby the bearing angle of the RF signal is determined.

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