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METHOD FOR CALCULATING CURRENT POSITION COORDINATE

  • US 20100156718A1
  • Filed: 04/06/2009
  • Published: 06/24/2010
  • Est. Priority Date: 12/19/2008
  • Status: Active Grant
First Claim
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1. A method for calculating current position coordinate, applicable to a global positioning system (GPS) receiver, comprising:

  • Step 1;

    searching for at least three satellites;

    Step 2;

    obtaining an ephemeris data of each of the at least three satellites at a first time point;

    Step 3;

    calculating a position coordinate of the GPS receiver at the first time point by utilizing the ephemeris data of each satellite;

    Step 4;

    calculating a position coordinate of each satellite at a second time point by utilizing the ephemeris data of each satellite, wherein the second time point is later than the first time point;

    Step 5;

    calculating a relative distance between the position coordinate of the GPS receiver at the first time point and the position coordinate of each satellite at the second time point;

    Step 6;

    evaluating a maximum moving distance of the GPS receiver from the first time point to the second time point;

    Step 7;

    calculating at least three distance ranges corresponding to the at least three satellites according to the respective relative distances and the maximum moving distance;

    Step 8;

    calculating a code delay of each satellite in the corresponding distance range to obtain the code delay of each satellite at the second time point; and

    Step 9;

    calculating the position coordinate of the GPS receiver at the second time point by utilizing the code delay at the second time point.

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