System for estimating the speed of an aircraft, and an application thereof to detecting obstacles
First Claim
Patent Images
1. A method of determining at least two components of the estimated speed vector ({right arrow over ({circumflex over (v)}) of an aircraft relative to the ground (19), the method comprising the following steps:
- successively forming at least two images (z1(x,y), z2(x,y)) of a single region of the ground, the images including distance data relating to the distance between the aircraft and points in the single region of the ground, the distance data corresponding to measurements delivered by a range finder;
determining offsets ({right arrow over (d)}) between the images;
determining a first raw or observed speed as a function of the offsets ({right arrow over (d)}) between the images;
making inertial measurements of the movement of the aircraft; and
combining the first raw or observed speed with the inertial measurements of the movement of the aircraft in order to determine the estimated speed vector({right arrow over ({circumflex over (v)}).
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Abstract
The invention relates to a method of determining an estimated speed of an aircraft relative to ground being overflown by the aircraft, in which use is made of the sum of an acceleration measurement of the aircraft plus a difference value, the difference value being obtained from observation data or signals relating to a region of the ground.
59 Citations
25 Claims
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1. A method of determining at least two components of the estimated speed vector ({right arrow over ({circumflex over (v)}) of an aircraft relative to the ground (19), the method comprising the following steps:
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successively forming at least two images (z1(x,y), z2(x,y)) of a single region of the ground, the images including distance data relating to the distance between the aircraft and points in the single region of the ground, the distance data corresponding to measurements delivered by a range finder; determining offsets ({right arrow over (d)}) between the images; determining a first raw or observed speed as a function of the offsets ({right arrow over (d)}) between the images; making inertial measurements of the movement of the aircraft; and combining the first raw or observed speed with the inertial measurements of the movement of the aircraft in order to determine the estimated speed vector({right arrow over ({circumflex over (v)}). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system (18) for determining an estimated speed vector ({right arrow over ({circumflex over (v)}) of an aircraft (25) including an inertial measurement unit (23) delivering inertial measurements relating to measured movement of the aircraft, the system further comprising:
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distance measurement means (11) for measuring distances between the aircraft and points in a region of the ground (19); means (16, 116, 216, 316, 416) for determining an observed or raw speed vector ({right arrow over (v)}R) as a function of the distances delivered by the distance measurement means (11); and hybridization means (24) for combining the inertial measurements and the observed or raw speed vector ({right arrow over (v)}R) and for delivering the estimated speed vector({right arrow over ({circumflex over (v)}), wherein the distance measurement means (11) is one of a lidar, a radar, and a sonar. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A method of detecting obstacles while on board an aircraft, the method comprising the following operations:
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extracting an observed or raw speed vector ({right arrow over (v)}R) for the aircraft from at least one sequence of images of a region overflown by the aircraft, the images being delivered by an observation sensor (11) installed on board the aircraft, each image comprising information including relative three-dimensional positions for the aircraft and a plurality of points of the region; obtaining echoes of the region from an on-board range finder; hybridizing the observed or raw speed vector with speed delivered by an on-board inertial sensor to obtain a hybrid speed; and detecting obstacles from the echoes and from the hybrid speed. - View Dependent Claims (25)
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Specification