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Apparatus for measuring a spatial angle to an emitter using squinted antennas

  • US 5,608,411 A
  • Filed: 06/09/1995
  • Issued: 03/04/1997
  • Est. Priority Date: 06/09/1995
  • Status: Expired due to Term
First Claim
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1. Apparatus for determining a spatial angular reference to an emitter of RF signals from phase measurements made between at least two antennas comprising:

  • a. at least a pair of dual polarized antennas having non-parallel, or "squinted", boresights for receiving an incident plane wave RF signal,b. a switch for selecting like-polarized outputs from each antenna of said pair,c. means for receiving and measuring the phases between like polarized outputs from said antennas as, respectively, first and second phase signals,d. a memory for storing respectively, the first and second phase signals,e. summing means for producing a third signal which is the sum of said first and second signals to thereby remove bias error, said third signal corresponding to the sin (AOA) component of the phase information determined by said means for receiving and measuring,f. differencing means for producing a fourth signal which corresponds to the difference between said first and second signals removing the sin (AOA) component of the received phase information leaving only bias error induced by antenna squint,g. processing means for estimating a spatial angle of the emitter from the value of said fourth signal, said spatial angle being referenced to a vector normal to a plane through the boresights of said antennas.

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