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Geodetic surveying system using multiple GPS base stations

  • US 5,155,490 A
  • Filed: 10/15/1990
  • Issued: 10/13/1992
  • Est. Priority Date: 10/15/1990
  • Status: Expired due to Fees
First Claim
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1. A method for determining the position coordinates of a GPS satellite receiver of unknown position, referred to as a mobile receiver, with respect to the earth'"'"'s surface, comprising the steps of:

  • (a) accumulating at said mobile receiver a plurality of code signals and carrier-phase signals broadcast by four or more GPS satellites;

    (b) computing, as a function of said accumulated signals, a position fix of the mobile receiver with respect to a network of at least three geographically dispersed base station receivers;

    (c) each said base station receiver having position coordinates that are known to a high degree of accuracy with respect to the position coordinates of the other base station receivers; and

    (d) each said base station receiver having a clock with (1) a direct measured time differential with respect to the clocks of the other base station receivers and (2) an estimated time differential with respect to an absolute time reference.

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