GPS Position Measuring Device
First Claim
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.
1 Assignment
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Accused Products
Abstract
A GPS position-measuring device includes a altitude-information memory for storing altitude information of a moving object, a combination determining unit for determining GPS-satellite combinations from GPS satellites that can be tracked, a position measuring unit for measuring a GPS based or GPS derived three-dimensional position of the moving object for each GPS-satellite combination, and a difference extracting unit for determining a difference in altitude between GPS derived altitude information contained in the measured GPS related three-dimensional position and the altitude information supplied from the altitude-information memory. The GPS position-measuring device further includes a position determining unit for comparing the extracted difference in altitude with a threshold value, selecting a GPS-satellite combination with which the difference in altitude is less than or equal to the threshold value, and determining a measurement position of the moving object based on the GPS derived three-dimensional position of the selected GPS-satellite combination.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A GPS position-measuring method for determining a position of a moving object by using GPS position measurement, the GPS position-measuring method comprising:
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obtaining non-GPS based altitude information of the moving object; determining (1) n GPS-satellite combinations of at least four GPS satellites from multiple GPS satellites that can be tracked and (2) a GPS derived three-dimensional position of the moving object for each of the GPS-satellite combinations, where n is a natural number; determining a difference in altitude between GPS derived altitude information contained in the GPS derived three-dimensional position and the non-GPS based altitude information; comparing the difference in altitude with a threshold value; selecting a GPS-satellite combination for which the associated difference in altitude is less than or equal to the threshold value; and determining a measurement position of the moving object based on the GPS derived three-dimensional position of the selected GPS-satellite combination. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A GPS position-measuring program for determining a position of a moving object by using GPS position measurement, the GPS position-measuring program comprising:
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obtaining non-GPS based altitude information of the moving object; determining (1) n GPS-satellite combinations of at least four GPS satellites from among multiple GPS satellites that can be tracked and (2) a GPS derived three-dimensional position of the moving object for each of the GPS-satellite combinations, where n is a natural number; determining a difference between GPS derived altitude information contained in the measured GPS derived three-dimensional position and the non-GPS based altitude information obtained; comparing the difference in altitude with a threshold value; selecting a GPS-satellite combination for which the difference in altitude is less than or equal to the threshold value; and determining a measurement position of the moving object based on the GPS derived three-dimensional position of the selected GPS-satellite combination. - View Dependent Claims (19, 20)
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Specification