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GPS Position Measuring Device

  • US 20080158053A1
  • Filed: 11/09/2007
  • Published: 07/03/2008
  • Est. Priority Date: 12/05/2006
  • Status: Active Grant
First Claim
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1. A GPS position-measuring device for determining a position of a moving object by using GPS position measurement, the GPS position-measuring device comprising:

  • altitude obtaining means for obtaining altitude information of the moving object;

    measuring means for determining (1) GPS-satellites combinations from among multiple GPS satellites that can be tracked and (2) a GPS based three-dimensional position of the moving object for each GPS-satellite combination;

    difference extracting means for determining a difference in altitude between altitude information associated with the GPS based three-dimensional position and the altitude information obtained by the altitude obtaining means; and

    position determining means for (a) comparing the extracted difference in altitude with a threshold value, (b) selecting a GPS-satellite combination for which the difference in altitude is less than or equal to the threshold value, and (c) determining a measurement position of the moving object based on the GPS based three-dimensional position of the selected GPS-satellite combination.

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