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Direction finding and mapping in multipath environments

  • US 20070115174A1
  • Filed: 06/30/2006
  • Published: 05/24/2007
  • Est. Priority Date: 07/06/2005
  • Status: Active Grant
First Claim
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1. A method for determining a direction of a direct arrival path between a receiver and a transmitter in a multipath environment wherein a received signal at the receiver includes a direct path signal component of a transmitted signal and a plurality of multipath signal components of the transmitted signal and wherein there is relative motion between at least two of the transmitter, the receiver and the scatterers of the multipath environment, comprising the steps of:

  • identifying in the received signal a doppler pedestal comprised of a plurality of multipath signal components having a range of doppler shifts, each multipath doppler shift being determined by a relative motion between a scatterer and at least one of the transmitter and the receiver, and a direct path signal component having a amplitude greater than an average amplitude of the doppler pedestal, and determining a direction and a magnitude of a doppler shift of the direct path signal component relative to the doppler pedestal as proportional to a relative speed and heading between the transmitter and the receiver.

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