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Position measuring system and method therefor

  • US 5,563,608 A
  • Filed: 07/27/1994
  • Issued: 10/08/1996
  • Est. Priority Date: 07/27/1993
  • Status: Expired due to Fees
First Claim
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1. A position measuring system comprising:

  • a receiver for receiving and demodulating signals from satellites;

    position deriving means for deriving a current position of a moving body based on said demodulated signals;

    first straight line deriving means, responsive to said demodulated signals being insufficient to enable said position deriving means from only deriving said current position, for deriving a first straight line based on said demodulated signals from two of said satellites, said first straight line deriving means deriving said first straight line as a horizontal line by assuming that an altitude of said moving body is constant;

    error evaluating means for evaluating an error which causes a positional deviation of said first straight line;

    second straight line deriving means for deriving a pair of second straight lines based on said first straight line, said second straight lines spacing from each other to define therebetween an area which corresponds to said evaluated error; and

    output means for outputting at least one of said current position derived by said position deriving means and said area defined between said second straight lines.

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