Aerospatiale Societe Nationale Industrielle

Societe Nationale Industrielle Et Aerospatiale

Office National D'etudes Et De Recherches Aerospatiales

Societe Anonyme Dite: Aerospatiale Societe Nationale Industrielle

Alain Appriou

Regis Barthelemy

Joseph Bensimon

Colette Coulombeix

Jean Dezert

Jean-Paul Guivarch

Michel Leveque

Francois Le Chevalier

The tracking of moving objects on land, in the air or at sea is effected by means of one or more sensors (S.sub.j.sup.1). The observation space of each sensor is divided into resolution cells (X.sup.1h) forming a grid. The sensors of the same grid are grouped together. A probability estimate (.beta.k) for a moving object being in a cell (Xk) which is an intersection of the resolution cells (X.sup.1h) is produced. For this purpose, the starting points are signals (M.sub.j.sup.1h) delivered by the sensors (S.sub.j.sup.1) and previously selected according to windowing criteria, sets of pairs (F.sub.i (M.sub.j.sup.1h)D.sub.ij.sup.1h) stored in memories (1) and coming from a prior supervised statistical learning, and tracking coefficients (.alpha.k) delivered by an adaptive tracking filter (4) of the PDAF type. After application of this probability (.beta.k) to the adaptive tracking filter (4), there is obtained on the one hand an estimated status (X*,P*) affording a trajectory prediction (x,S) for at least one moving object and, on the other hand, the windowing criterion is adjusted.

Method for tracking moving objects

An airborne system is disclosed for determining the position of an aerial vehicle. According to the invention, a first memory is provided containing the general characteristics of different types of discrete landmarks and a second memory containing the geographic position of such landmarks on the ground to be flown over, a device for extracting, from the signals delivered by sensitive means, the general characteristics of said different types of discrete landmarks located on the ground being flown over, and a device for computing from the signals delivered by said sensitive means the relative positions of said vehicle with respect to said recognized landmarks, which it feeds to Kalman filter means.

Airborne system for determining the position of an aerial vehicle and

A method and device are disclosed for recognizing a target (T) among a plurality of n known targets Ti (with i=1, 2, 3, . . . , n). According to the invention, by direct examination of said target (T) to be recognized and from first values (Cki) representative of a plurality of p recognition criteria Ck (with k=1, 2, 3, . . . , p), at least p third values (pCk(Ti)) are established representative of the probabilities that, for each recognition criterion (Ck), the target (T) to be recognized is each of said known targets (Ti); and said third values associated with the same known target (Ti) are merged while taking into account second values (PCk(Ti)) representative of the probabilities that a target (Ti) is recognized, in so far as criterion Ck is concerned, when it is examined so as to obtain n fourth values (p(Ti)), each of which is representative of the probability that the target to be recognized is one of the known targets (Ti).

Method and device for recognizing a target

This invention relates to a multi-target guiding system for missile, wherein it is provided with an electronic scanning antenna; it effects a classification of the targets by order of priority and orients the missile by controlling the control surfaces towards the target of highest priority. During classification, the system causes the direction of advance of said missile to vary in order to maintain said targets in its domain of action for as long as possible.

System for automatically guiding a missile and missile provided with

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Saclay, France

Alain Appriou