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Combined ground and satellite system for global aircraft surveillance guidance and navigation

  • US 5,627,546 A
  • Filed: 09/05/1995
  • Issued: 05/06/1997
  • Est. Priority Date: 09/05/1995
  • Status: Expired due to Fees
First Claim
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1. A combined ground and satellite system for providing aircraft guidance, said system comprising:

  • a satellite subsystem which includes a constellation of satellites and a plurality of ground stations positioned at selected locations;

    a ground subsystem which includes a network of ground stations positioned at selected locations; and

    an airborne subsystem which includes a plurality of transponder units located in respective ones of aircraft utilizing the system;

    the transponder units of the airborne subsystem each including means providing a first spread spectrum band data link with the satellites and ground stations of the ground subsystem, the satellites each including means providing a second spread spectrum band data link with the airborne subsystem, and the ground stations of the ground subsystem each including means providing a third spread spectrum band data link with the airborne subsystem, each of said spread spectrum band data links including means providing a selected form of spread spectrum coding comprising a plurality of different codes to provide identification of individual ones of said satellites, and ground stations.

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