AUTOMOTIVE LOCATION DATA INTEGRITY
First Claim
1. A method of operating an automotive location estimation system, the method comprising:
- ascertaining a satellite-based position estimation using a global navigation satellite system device;
ascertaining a dead reckoning position estimation using a dead reckoning system;
determining a location estimation by combining the satellite position estimation and the dead reckoning position estimation;
determining a map-matching position by performing map matching using data associated with at least one of the satellite-based position and the dead reckoning position in connection with a map including a plurality of map features;
determining an integrity of the location estimation by comparing a test statistic calculated by evaluating the map-matching position and the location estimation with a decision threshold based upon a predetermined location estimation accuracy specification;
providing, if the test statistic is less than the decision threshold, the location estimation; and
providing, if the test statistic is greater than the decision threshold, an indication that the integrity of the location estimation does not satisfy the predetermined location estimation accuracy specification.
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Abstract
A method of operating an automotive location system may include providing a timely warning if the system cannot satisfy predetermined performance criteria. An example method may include ascertaining a satellite-based position estimation ascertaining a dead reckoning position estimation, determining a location estimation by combining the satellite position estimation and the dead reckoning position estimation, determining a map-matching position, and determining an integrity of the location estimation by comparing a test statistic calculated by evaluating the map-matching position and the location estimation with a decision threshold based upon a predetermined location estimation accuracy specification. If the test statistic is less than the decision threshold, the system may provide the location estimation. If the test statistic is greater than the decision threshold, the system may provide an indication that the integrity of the location estimation does not satisfy the predetermined location estimation accuracy specification.
44 Citations
20 Claims
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1. A method of operating an automotive location estimation system, the method comprising:
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ascertaining a satellite-based position estimation using a global navigation satellite system device; ascertaining a dead reckoning position estimation using a dead reckoning system; determining a location estimation by combining the satellite position estimation and the dead reckoning position estimation; determining a map-matching position by performing map matching using data associated with at least one of the satellite-based position and the dead reckoning position in connection with a map including a plurality of map features; determining an integrity of the location estimation by comparing a test statistic calculated by evaluating the map-matching position and the location estimation with a decision threshold based upon a predetermined location estimation accuracy specification; providing, if the test statistic is less than the decision threshold, the location estimation; and providing, if the test statistic is greater than the decision threshold, an indication that the integrity of the location estimation does not satisfy the predetermined location estimation accuracy specification. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating an automotive application, the method comprising:
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receiving at least one of a location estimation and a location estimation integrity alarm from an automotive navigation system, wherein the automotive navigation system ascertains the location estimation using at least a satellite-based position estimation from a global navigation satellite system and a dead reckoning position from a dead reckoning system; utilizing the location estimation to provide a driver assistance function, if the location estimation is received from the automotive navigation system; and providing a notification associated with potentially unreliable performance of the driver assistance function, if the location estimation integrity alarm is received from the automotive navigation system. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An automotive navigation system comprising:
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a global navigation satellite system device configured to provide a satellite-based position estimation; a dead reckoning device configured to provide a dead reckoning position estimation; a sensor fusion device configured to integrate the satellite-based position estimation and the dead reckoning position estimation to provide a location estimation; a map-matching component configured to provide a map-matching position estimation based upon a plurality of map features of a map; and a location estimation integrity output operative to selectively provide a notification that the location estimation does not satisfy a location estimation accuracy specification based upon consideration of the map-matching position estimation in connection with at least one of the satellite-based position estimation and the dead reckoning position estimation. - View Dependent Claims (17, 18, 19, 20)
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Specification