SYSTEMS AND METHODS FOR DETERMINING LOCATION INFORMATION USING DUAL FILTERS
First Claim
1. A method for determining a real time location of a aircraft, comprising:
- receiving inertial navigation system information and global navigation satellite system (GNSS) information with a real time Kalman filter;
determining the real time location of the aircraft with the real time Kalman filter based upon the inertial navigation system information and the GNSS information;
delaying the GNSS information by an interval;
receiving the inertial navigation system information and the delayed GNSS information with a delay Kalman filter;
determining a predictive location of the aircraft with the delay Kalman filter based upon the inertial navigation system information, the delayed GNSS information, and the interval; and
in response to an inaccuracy of the real time location determined from the real time Kalman filter, selecting the predictive location determined from the delay Kalman filter as a new real time location of the aircraft.
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Accused Products
Abstract
System and methods of increasing reliability of determined location information by using two integration filters are provided. An exemplary embodiment integrates inertial navigation system information and global navigation satellite system (GNSS) information in a real time Kalman filter; determines a real time location of the aircraft with the real time Kalman filter based upon the INS information and the GNSS information; delays the GNSS information by an interval; integrates the INS information and the delayed GNSS information in a delay Kalman filter; determines a predictive location of the aircraft with the delay Kalman filter based upon the INS information, the delayed GNSS information, and the interval; and in response to an inaccuracy of the real time location determined from the real time Kalman filter, selects the predictive location determined from the delay Kalman filter as a new real time location of the aircraft.
52 Citations
18 Claims
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1. A method for determining a real time location of a aircraft, comprising:
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receiving inertial navigation system information and global navigation satellite system (GNSS) information with a real time Kalman filter; determining the real time location of the aircraft with the real time Kalman filter based upon the inertial navigation system information and the GNSS information; delaying the GNSS information by an interval; receiving the inertial navigation system information and the delayed GNSS information with a delay Kalman filter; determining a predictive location of the aircraft with the delay Kalman filter based upon the inertial navigation system information, the delayed GNSS information, and the interval; and in response to an inaccuracy of the real time location determined from the real time Kalman filter, selecting the predictive location determined from the delay Kalman filter as a new real time location of the aircraft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system that determines a real time location of a aircraft, comprising:
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a real time filter operable to receive first location information from an inertial navigation system, operable to receive second location information from a global navigation satellite system (GNSS) receiver, and operable to determine real time location information of the aircraft based upon the inertial navigation system information, the delayed GNSS information, and the interval; a time interval unit operable to receive the second location information from the GNSS receiver, and operable to delay the received second location information by a time interval; a delay filter communicatively coupled to the time interval unit, operable to receive from the inertial navigation system the first location information, operable to receive from the time interval unit the second location information delayed by the interval, and operable to determine predictive location information of the aircraft based upon the first location information, the second location information delayed by the interval, and the interval; and an airborne GNSS device operable to identify a corruption of the second location information, and in response to determining that the second location information is corrupted, is further operable to cause the predictive location information to be output to at least one of a flight management system and an auto pilot system. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification