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Site-specific doppler navigation system for back-up and verification of GPS

  • US 6,593,875 B2
  • Filed: 06/29/2001
  • Issued: 07/15/2003
  • Est. Priority Date: 06/29/2001
  • Status: Active Grant
First Claim
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1. A system for identifying a position of an airborne platform on a flight path which comprises:

  • a radar means mounted on the platform for directing an “

    n”

    number of radar beams on respective predetermined paths toward the surface of the earth to generate an “

    n”

    number of return signals, wherein “

    n”

    is at least equal to three;

    an electronic means connected with said radar means for using said “

    n”

    number of return signals to compute a ground speed, a direction of flight and an altitude for the platform to identify the position of the platform on its flight path; and

    a computer means preprogrammed with site-specific radar clutter model data for matching with said return signals to establish a start point location on the flight path to determine a route of flight for the platform.

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