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Aircraft satellite navigation precision-approach system including CDMA datalink

  • US 5,995,043 A
  • Filed: 12/06/1996
  • Issued: 11/30/1999
  • Est. Priority Date: 12/06/1996
  • Status: Expired due to Fees
First Claim
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1. A landing assistance system for providing navigation information to an aircraft, said landing assistance system including:

  • (a) a plurality of satellites transmitting GPS ranging signals containing satellite data sufficient to determine an approximate range between said aircraft and each satellite; and

    (b) at least one GPS ground station positioned at a fixed location on the ground, said GPS ground station including;

    (i) at least one receiver operative for receiving said satellite GPS ranging signals and determining pseudoranges to said satellites;

    (ii) at least one data processor operative for determining differential correction information; and

    (iii) a datalink transmitter operative for transmitting a datalink signal containing said differential correction information, wherein said datalink signal is a code division multiple access (CDMA) spread spectrum signal within the VHF navigation band, and wherein said datalink signal contains ranging information sufficient to determine the range between said aircraft and said at least one GPS ground station.

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