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 non-GPS altitude information of the moving object;
measuring means for determining (1) multiple GPS-satellite combinations from among multiple GPS satellites that can be tracked and (2) a GPS based three-dimensional position of the moving object for each of the multiple GPS-satellite combinations;
difference extracting means for determining a difference in altitude between altitude information associated with the GPS based three-dimensional position and the non-GPS altitude information obtained by the altitude obtaining means for each of the multiple GPS-satellite combinations; and
position determining means for comparing the extracted difference in altitude with a threshold value for each of the multiple GPS-satellite combinations, wherein when a single GPS-satellite combination for which the difference in altitude is less than or equal to the threshold value, the position determining means selects the single GPS-satellite combination, and when multiple GPS-satellite combinations for which the difference in altitude is less than or equal to the threshold value exist, the position determining means selects a minimum GPS-satellite combination for which the difference in altitude is a minimum from among the multiple GPS-satellite combinations that can be tracked, and a measurement position of the moving object is determined based on the GPS based three-dimensional position of the selected GPS-satellite combination.
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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
16 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 non-GPS altitude information of the moving object; measuring means for determining (1) multiple GPS-satellite combinations from among multiple GPS satellites that can be tracked and (2) a GPS based three-dimensional position of the moving object for each of the multiple GPS-satellite combinations; difference extracting means for determining a difference in altitude between altitude information associated with the GPS based three-dimensional position and the non-GPS altitude information obtained by the altitude obtaining means for each of the multiple GPS-satellite combinations; and position determining means for comparing the extracted difference in altitude with a threshold value for each of the multiple GPS-satellite combinations, wherein when a single GPS-satellite combination for which the difference in altitude is less than or equal to the threshold value, the position determining means selects the single GPS-satellite combination, and when multiple GPS-satellite combinations for which the difference in altitude is less than or equal to the threshold value exist, the position determining means selects a minimum GPS-satellite combination for which the difference in altitude is a minimum from among the multiple GPS-satellite combinations that can be tracked, and a measurement position of the moving object is determined based on the GPS based three-dimensional position of the selected GPS-satellite combination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 that is equal to 5 or more; 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 for each of the n GPS-satellite combinations of at least four GPS satellites that can be tracked; selecting a GPS-satellite combination from among the n GPS-satellite combinations of at least four GPS satellites that can be tracked for which the associated difference in altitude between GPS derived altitude information contained in the GPS derived three-dimensional position and the non-GPS based altitude information is a minimum; and determining a measurement position of the moving object based on the GPS derived three-dimensional position of the selected GPS-satellite combination having the GPS derived altitude information that is closest to the non-GPS based altitude information from among the n GPS-satellite combinations of at least four GPS satellites that can be tracked. - View Dependent Claims (10, 11, 12, 13, 14)
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15. 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 among multiple GPS satellites tat can be tracked and (2) a GPS derived three-dimensional position of the moving object for each of the n GPS-satellite combinations, where n is a natural number that is equal to 5 or more; 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 for each of the n GPS-satellite combinations; comparing the difference in altitude with a threshold value for each of the n GPS-satellite combinations; wherein, when only a single GPS-satellite combination for which the difference in altitude is less than or equal to the threshold value exists, the single GPS-satellite combination is selected to be the selected GPS-satellite combination, and when multiple GPS-satellite combinations for which the difference in altitude is less than or equal to the threshold value exist, a minimum difference GPS-satellite combination for which, the difference in altitude is a minimum from among the multiple GPS-satellite combinations is selected to be the selected GPS-satellite combination; 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 (16)
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Specification