Position calculating method and position calculating device
First Claim
1. A position calculating method of calculating a position of a moving object using a first measurement result of a satellite positioning receiver unit disposed in the moving object and a second measurement result of an inertial positioning sensor unit disposed in the moving object, comprising:
- determining position calculation accuracy;
comparing the position calculation accuracy to a set of three or more accuracy threshold ranges;
adjusting an influence of the first measurement result of the satellite positioning receiver unit on the second measurement result of the inertial positioning sensor unit to one of three or more influence levels corresponding to the accuracy threshold ranges on the basis of the position calculation accuracy; and
calculating the position of the moving object by performing a coupling process of coupling the first measurement result and the second measurement result on the basis of the adjusted influence,wherein adjusting the influence includes performing one of;
setting a frequency of performing the coupling process to be lower with higher position calculation accuracy; and
setting an error parameter value used in a Kalman filtering process to be larger with higher position calculation accuracy.
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Accused Products
Abstract
In a position calculating device of a moving object including a satellite positioning unit and an inertial positioning unit, a position calculation accuracy determining unit determines a position calculation accuracy and sets an influence level of measurement result 1 of the satellite positioning unit on measurement result 2 of the inertial positioning unit on the basis of the determined position calculation accuracy. The position of the moving object is calculated by performing a coupling process of coupling measurement result 1 and measurement result 2 on the basis of the set influence level.
10 Citations
8 Claims
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1. A position calculating method of calculating a position of a moving object using a first measurement result of a satellite positioning receiver unit disposed in the moving object and a second measurement result of an inertial positioning sensor unit disposed in the moving object, comprising:
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determining position calculation accuracy; comparing the position calculation accuracy to a set of three or more accuracy threshold ranges; adjusting an influence of the first measurement result of the satellite positioning receiver unit on the second measurement result of the inertial positioning sensor unit to one of three or more influence levels corresponding to the accuracy threshold ranges on the basis of the position calculation accuracy; and calculating the position of the moving object by performing a coupling process of coupling the first measurement result and the second measurement result on the basis of the adjusted influence, wherein adjusting the influence includes performing one of; setting a frequency of performing the coupling process to be lower with higher position calculation accuracy; and setting an error parameter value used in a Kalman filtering process to be larger with higher position calculation accuracy. - View Dependent Claims (2, 3, 4, 5, 7, 8)
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6. A position calculating device calculating a position of a moving object using a first measurement result of a satellite positioning receiver unit disposed in the moving object and a second measurement result of an inertial positioning sensor unit disposed in the moving object, comprising:
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a position calculation accuracy determining unit that determines a position calculation accuracy; an influence level setting unit that compares the position calculation accuracy to a set of three or more accuracy threshold ranges, and adjusts an influence of the first measurement result of the satellite positioning receiver unit on the second measurement result of the inertial positioning sensor unit to one of three or more influence levels corresponding to the accuracy threshold ranges on the basis of the position calculation accuracy; and a coupling unit that calculates the position of the moving object by performing a coupling process of coupling the first measurement result and the second measurement result on the basis of the adjusted influence, wherein adjusting the influence includes performing one of; setting a frequency of performing the coupling process to be lower with higher position calculation accuracy; and setting an error parameter value used in a Kalman filtering process to be larger with higher position calculation accuracy.
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Specification