Method for correcting position error in navigation system
First Claim
1. A method for correcting position error in a navigation system, the method comprising the steps of:
- receiving a current position measurement of a moving object from GPS/DR (Dead Reckoning)-based information;
correcting the current location measurement using at least one displacement-corrected value;
performing map matching using the corrected current position measurement;
calculating variation of correction angle by extracting a current correction angle out of the map matching result;
converting and correcting the displacement-corrected value in view of the current correction angle; and
compensating the displacement-corrected value by applying a predetermined constant to the converted displacement-corrected value, and storing the compensated displacement-corrected value.
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Abstract
A method for correcting position error in a navigation system enables one to more accurately match a position measurement of a moving object on a digital map. Particularly, the method comprises the steps of: receiving a current position measurement of a moving object from GPS/DR (Dead Reckoning)-based information; correcting the current location measurement using a displacement-corrected value; performing map matching using the corrected current position measurement; calculating variation of correction angle by extracting a current correction angle out of the map matching result; converting and correcting a previous displacement-corrected value to the current correction angle; and compensating the displacement-corrected value by applying a predetermined constant to the converted displacement-corrected value, and storing the compensated displacement-corrected value.
68 Citations
16 Claims
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1. A method for correcting position error in a navigation system, the method comprising the steps of:
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receiving a current position measurement of a moving object from GPS/DR (Dead Reckoning)-based information;
correcting the current location measurement using at least one displacement-corrected value;
performing map matching using the corrected current position measurement;
calculating variation of correction angle by extracting a current correction angle out of the map matching result;
converting and correcting the displacement-corrected value in view of the current correction angle; and
compensating the displacement-corrected value by applying a predetermined constant to the converted displacement-corrected value, and storing the compensated displacement-corrected value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for correcting position error in a navigation system, the method comprising the steps of:
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receiving a current position measurement of a moving object by making use of a GPS/DR (Dead Reckoning) method;
correcting the current location measurement using a previous displacement-corrected value;
performing map matching using the corrected current position measurement; and
calculating out of the map matching result a variation of correction angle, and a compensated displacement-corrected value along heading by extracting a current correction angle out of the map matching result. - View Dependent Claims (14)
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15. A method for correcting position error in a navigation system, the method comprising the steps of:
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receiving a current position measurement of a vehicle obtained from a GPS signal and sensors installed in the vehicle;
correcting the current position measurement of the vehicle to a previously map-matched x- and y-displacement corrected values, and performing map matching on the corrected values;
calculating a current correction angle by extracting a map-matched position of the vehicle and a link angle;
calculating variation of correction angle between the current correction angle and a previously map-matched correction angle, and deciding whether the variation of correction angle is less than a predetermined angle;
if the variation of correction angle is not less than the predetermined angle, initializing x- and y-displacement corrected value to ‘
0’
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storing x- and y-displacement corrected values being calculated.
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16. A method for correcting position error in a navigation system, the method comprising the steps of:
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receiving a GPS position measurement;
extracting candidate links within a predetermined search range around the GPS position measurement;
among a plurality of interpolation points on the candidate links, selecting a spot between interpolation points with highest possibilities; and
among candidate links including the selected spot between interpolation points, selecting a link with a highest possibility of having a moving object, and performing map matching.
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Specification