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RADIO DIRECTION FINDING SYSTEM

  • US 3,845,487 A
  • Filed: 09/26/1972
  • Issued: 10/29/1974
  • Est. Priority Date: 09/26/1972
  • Status: Expired due to Term
First Claim
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1. A radio direction finding system depending on the angle dependent doppler shift imposed on a distant-source signal of frequency f comprising a single antenna exclusively receiving said distant source signal, said single antenna having an electronically simulated motion, first and second doppler shifted signals of frequencies f1 and f2, respectively, propagating along and against the direction of motion of said single antenna, first and second terminals receiving said first and second doppler shifted signals, respectively, said single antenna being positioned between said first and second terminals, means to add only the frequencies f1 and f2 of said first and second doppler shifted signals, respectively, to obtain a second resultant frequency signal, and means to divide said first resultant frequency signal by said second resultant frequency signal to obtain the angle of arrival measurement.

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