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Synthetic-aperture communications receivers

  • US 6,775,520 B2
  • Filed: 01/22/2003
  • Issued: 08/10/2004
  • Est. Priority Date: 01/22/2002
  • Status: Expired due to Fees
First Claim
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1. A method of improving the performance of a receiver receiving a signaling stream on a camel frequency from a transmitter in an environment wherein relative motion exists between the receiver and transmitter at a velocity and in a direction of movement, the method comprising the steps of;

  • estimating a Doppler shift in the cattier frequency due to the relative motion;

    determining the apparent angle between the receiver and transmitter relative to the direction of movement as a function of the Doppler shift;

    using the apparent angle to produce time-delayed replicas of the received signaling stream; and

    coherently adding the time-delayed replicas of the signaling stream to synthesize an increased apparent receiver antenna aperture.

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