Method for estimating the elevation angle of a ballistic...

G - Physics – 01 – S

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G01S 13/66 (2006.01)

Patent

CA 2671202

The present invention relates to the implementation of a method making it possible to determine in an accurate manner, the elevation of a projectile along a ballistic trajectory by means of the information provided by a conventional Doppler surveillance radar. The method according to the invention consists, on the basis of the quantities (A) and (B) representing respectively the first derivative and the second derivative with respect to time of the Doppler speed d of the projectile, in calculating firstly the estimate (C) of the value of the radial component .GAMMA..rho. of the acceleration of the projectile, then in calculating on the basis of d, (A) and (C) the estimate (D) of the speed V of the projectile, then finally in calculating on the basis of d and (D) the estimate Ê of its angle of elevation E. The method according to the invention applies in particular to the protecting of sensitive zones from the firing of ballistic projectiles.

La présente invention concerne la mise en oeuvre d'un procédé permettant de déterminer de manière précise, l'élévation d'un projectile suivant une trajectoire balistique au moyen des informations fournies par un radar de veille Doppler classique. Le procédé selon l'invention consiste, à partir des grandeurs (A) et (B) représentant respectivement la dérivée première et la dérivée seconde par rapport au temps de la vitesse Doppler d du projectile, à calculer d'abord l'estimation (C) de la valeur de la composante radiale .GAMMA..rho. de l'accélération du projectile, puis à calculer à partir de d, (A) et (C) l'estimation (D) de la vitesse V du projectile, puis enfin à calculer à partir de, d et (D) l'estimation Ê de son angle d'élévation E. Le procédé selon l'invention s'applique en particulier à la protection de zones sensibles contre le tir de projectiles balistiques.

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