Method For Estimating An Aircraft Distance Taking Into Account Air Navigation Constraints
First Claim
1. A method of estimating distances of points in a map extracted from a terrain elevation database, with respect to an aircraft subjected, to dynamic altitude restrictions prohibiting it from crossing certain reliefs on the map that are too high whose configuration varies according to the vertical flight profile imposed upon it and, to constraints and restrictions coming from air navigation regulations;
- the terrain elevation database having a set of points each referenced by an elevation, a latitude and a longitude, and corresponding to the regular meshing of a location grid;
the methods comprising the steps of implementing, on the image constituted by the elements of the database which correspond to the map and are disposed in lines and columns in order of values of latitude and longitude, a propagation distance transform assimilating the distances of the different points of the image with respect to a source point placed close to the aircraft, to the shortest joining paths compatible with the dynamic altitude restrictions of the aircraft, and with air navigation constraints and restrictions.
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Abstract
This method uses for the estimation of a distance, a propagation distance transform considering only the paths which are both accessible to the aircraft taking account of its vertical flight profile and complying with air regulations. The propagated distance Dp is accompanied by a propagated altitude Ap which at all points follows the vertical flight profile of the aircraft, whilst being greater than the altitudes of these points and complying with the air regulation constraints at these points. This is obtained by subjecting the propagation to compliance with the vertical flight profile of the aircraft, constraints of the elevations of the points of the relief and air regulation constraints.
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Citations
12 Claims
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1. A method of estimating distances of points in a map extracted from a terrain elevation database, with respect to an aircraft subjected, to dynamic altitude restrictions prohibiting it from crossing certain reliefs on the map that are too high whose configuration varies according to the vertical flight profile imposed upon it and, to constraints and restrictions coming from air navigation regulations;
- the terrain elevation database having a set of points each referenced by an elevation, a latitude and a longitude, and corresponding to the regular meshing of a location grid;
the methods comprising the steps of implementing, on the image constituted by the elements of the database which correspond to the map and are disposed in lines and columns in order of values of latitude and longitude, a propagation distance transform assimilating the distances of the different points of the image with respect to a source point placed close to the aircraft, to the shortest joining paths compatible with the dynamic altitude restrictions of the aircraft, and with air navigation constraints and restrictions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- the terrain elevation database having a set of points each referenced by an elevation, a latitude and a longitude, and corresponding to the regular meshing of a location grid;
Specification