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Method and device for preventing collisions with the ground for an aircraft
| Details |
Inventors: Chazelle, Xavier; Hunot, Anne-Marie; Lepere, Gerard;
Assignee: Dassault Electronique (Saint Cloud, FR)
Primary Examiner: Zanelli; Michael
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye P.C.
A mass memory stores a data base representing at least a substantial part of the terrestrial globe, in accordance with a grid configuration on several levels, said grid configuration being in particular more precise in the vicinity of an airport. Status indications are received representing the position of the aircraft with two horizontal components, and the altitude, and the velocity and acceleration vectors of the aircraft, as well as control indications coming from the flight deck. In accordance with the horizontal components of the position of the aircraft, a temporary local map is transferred into a fast access memory, on the basis of which map, an altitude envelope of the terrain is established in the zone where the aircraft is travelling. Anticollision processing make it possible to establish an alarm if the relation between a protection field and the altitude envelope meets a first condition which is defined at least partly by the control indications. The device has application as an aid for aerial navigation. |
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DETAILED DESCRIPTION We claim: 1.
In an aerial navigation aid device, the improvement comprising: (a) mass memory means for storing a data base representing at least a substantial part of the terrestrial globe, in a cutout form comprising a grid configuration having at least one level of resolution, each grid being associated with at least one data item representing the maximum altitude inside the grid, said data base having sets of contiguous grids, accessible in accordance with a system of addressing by two horizontal coordinates; (b) input means for receiving status indications representing the position of the aircraft with two horizontal components and the altitude, and its velocity vector, defining the present flight path of the aircraft; (c) a fast access working memory; (d) management means, responsive to said status indications, for accessing said data base to maintain a temporary local map in said fast access working memory, said temporary local map corresponding to the zone wherein the aircraft is traveling, and defining a ground altitude envelope of the terrain in said zone; (e) anti-collision means for determining whether the present flight path matches first and second anti-collision laws in relationship with said ground altitude envelope; and (f) alarm means capable of selectively establishing a first alarm in accordance with a first condition, which includes the fact that said first anti-collision law is violated, and a second alarm in accordance with a second condition, which includes the fact that said second anti-collision law is violated.
2.
A device according to claim 1, wherein the resolution of said temporary local map is variable, with a higher resolution being provided for, at least in the vicinity of airport zones.
3.
A device according to claim 1, wherein said first and second anti-collision laws are specific to the aircraft.
4.
A device according to claim 1, wherein the altitude in said position data comprises baro-inertial altitude.
5.
A device according to claim 4, wherein the altitude in said position data comprises altitude data from an independent radionavigational source
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