System and method for validating rotorcraft position coordinates
First Claim
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1. A flight control system for a rotorcraft comprising:
- a processor and a non-transitory computer readable storage medium with an executable program stored thereon, the executable program including instructions for;
asynchronously receiving position coordinates of a rotorcraft from a position sensor, each received position coordinate comprising a coarse resolution position coordinate and a fine resolution position coordinate; and
determining whether the coarse resolution position coordinates and the fine resolution position coordinate of the received position coordinates correspond with each other, determining comprising calculating a difference between a presently received position coordinate and a previously received position coordinate, and comparing the calculated difference to a threshold, wherein the threshold is based on a velocity of the rotorcraft.
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Abstract
In accordance with an embodiment, a method of operating a rotorcraft includes receiving a first sensor value comprising a first coarse resolution portion and a first fine resolution portion, receiving a second sensor value comprising a second coarse resolution portion and a second fine resolution portion, and determining that the second coarse resolution portion corresponds with the second fine resolution portion when a difference between the second sensor value and the first sensor value is within a first threshold.
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Citations
22 Claims
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1. A flight control system for a rotorcraft comprising:
a processor and a non-transitory computer readable storage medium with an executable program stored thereon, the executable program including instructions for; asynchronously receiving position coordinates of a rotorcraft from a position sensor, each received position coordinate comprising a coarse resolution position coordinate and a fine resolution position coordinate; and determining whether the coarse resolution position coordinates and the fine resolution position coordinate of the received position coordinates correspond with each other, determining comprising calculating a difference between a presently received position coordinate and a previously received position coordinate, and comparing the calculated difference to a threshold, wherein the threshold is based on a velocity of the rotorcraft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A rotorcraft comprising:
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a body; a power train coupled to the body and comprising a power source and a drive shaft coupled to the power source; a main rotor system coupled to the power train and comprising a plurality of main rotor blades; a GPS receiver system configured sense a physical position and produce position coordinates based on the sensed physical position, wherein each position coordinate comprises a latitude coordinate split into a coarse resolution latitude coordinate comprising the most significant bits of the latitude coordinate and a fine resolution latitude coordinate comprising the least significant bits of the latitude coordinate, and a longitude coordinate split into a coarse resolution longitude coordinate comprising the most significant bits of the longitude coordinate and a fine resolution longitude coordinate comprising the least significant bits of the longitude coordinate; a flight control system operable to change at least one operating condition of the main rotor system; a pilot control assembly configured to receive commands from a pilot, wherein the flight control system is a fly-by-wire flight control system in electrical communication with the pilot control assembly; and a flight control computer in electrical communication between the flight control system, the GPS receiver system, and the pilot control assembly, the flight control computer configured to asynchronously receive the position coordinates from the GPS receiver system via a bus, determine whether the coarse resolution latitude coordinate corresponds with the fine resolution latitude coordinate by comparing a difference between the latitude coordinate and a previously received latitude coordinate to a first threshold, and determine whether the coarse resolution longitude coordinate corresponds with the fine resolution longitude coordinate by comparing a difference between the longitude coordinate and a previously received longitude coordinate to a second threshold, wherein the first threshold and the second threshold are based on a velocity of the rotorcraft. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of operating a rotorcraft, the method comprising:
asynchronously receiving position coordinates of a rotorcraft from a position sensor, each received position coordinate comprising a coarse resolution position coordinate and a fine resolution position coordinate; and determining whether the coarse resolution position coordinates and the fine resolution position coordinate of the received position coordinates correspond with each other, determining comprising calculating a difference between a presently received position coordinate and a previously received position coordinate, and comparing the calculated difference to a threshold, wherein the threshold is based on a velocity of the rotorcraft. - View Dependent Claims (17, 18, 19, 20, 21, 22)
Specification