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BINARY BEAM SYSTEM

  • US 3,863,258 A
  • Filed: 06/28/1973
  • Issued: 01/28/1975
  • Est. Priority Date: 09/14/1971
  • Status: Expired due to Term
First Claim
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1. In a digital direction finding system, a pair of spaced apart antennas, means deriving squared sum and squared difference signals from said antennas and producing a digit of the code representing the greater amplitude between the squared sum and squared difference signals, means deriving phase shifted squared sum and squared difference signals from said antennas where an output of one antenna is shifted in phase by a fixed displacement, and producing another digit of said code representing the greater amplitude between the phase shifted squared sum and squared difference signals, means comparing the absolute amplitude of the squared sum minus squared difference signals with the absolute amplitude of the squared sum minus squared difference phase displaced signals and producing an additional digit of the code representing the greater of the absolute amplitudes, and means producing an additional lower digit of the code by comparing the smaller of said absolute amplitudes with a preset fixed amplitude reference signal.

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