Method of and system for deriving inertial-aided deviations for autoland systems during GPS signal interruptions
First Claim
1. An airplane guidance method involving an inertial reference system and a GPS landing system, the airplane guidance method comprising:
- converting position coordinates of an aircraft from the inertial reference system to runway, lateral, and vertical coordinates;
calibrating runway distance and lateral distance based on the converted position coordinates from the inertial reference system using runway distance and lateral distance from the GPS landing system with a third-order calibration filter when the aircraft is below a first height above terrain;
calibrating vertical distance based on the converted position coordinates from the inertial reference system using vertical distance from the GPS landing system with a second-order calibration filter when the aircraft is below the first height above terrain; and
using the calibrated runway, lateral, and vertical distances for deviation computations when GPS signals are interrupted below a second height above terrain.
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Abstract
Deriving inertial-aided deviations for autoland systems during GPS signal interruptions involving an inertial reference system and a GPS landing system can include converting position coordinates of an aircraft from the inertial reference system to runway, lateral, and vertical coordinates. After this conversion, the method calibrates runway distance and lateral distance based on the converted position coordinates from the inertial reference system using runway distance and lateral distance from the GPS landing system with a third-order calibration filter when the aircraft is below a first height above terrain and calibrates vertical distance based on the converted position coordinates from the inertial reference system using vertical distance from the GPS landing system with a second-order calibration filter when the aircraft is below the first height above terrain. The method uses the calibrated runway, lateral, and vertical distances for deviation computations when GPS signals are interrupted below a second height above terrain.
23 Citations
20 Claims
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1. An airplane guidance method involving an inertial reference system and a GPS landing system, the airplane guidance method comprising:
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converting position coordinates of an aircraft from the inertial reference system to runway, lateral, and vertical coordinates;
calibrating runway distance and lateral distance based on the converted position coordinates from the inertial reference system using runway distance and lateral distance from the GPS landing system with a third-order calibration filter when the aircraft is below a first height above terrain;
calibrating vertical distance based on the converted position coordinates from the inertial reference system using vertical distance from the GPS landing system with a second-order calibration filter when the aircraft is below the first height above terrain; and
using the calibrated runway, lateral, and vertical distances for deviation computations when GPS signals are interrupted below a second height above terrain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of deriving inertial-aided deviations for autoland systems during GPS signal interruptions, the method comprising:
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generating global positioning positions;
generating inertial reference system positions; and
generating calibrated positions based on the global positioning positions and the inertial reference system positions using a third-order calibration filter and a second-order calibration filter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system for deriving inertial-aided deviations for autoland systems during GPS signal interruptions, the system comprising:
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a first component for generating global positioning positions;
a second component for generating inertial reference system positions;
a third component for generating calibrated positions based on the global positioning positions and the inertial reference system positions using a third-order calibration filter and a second-order calibration filter; and
a fourth component for providing airplane control signals using deviation computations from the generated calibrated positions when the calibration filters converge. - View Dependent Claims (19, 20)
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Specification