Elevation estimation method and radar apparatus using it

G - Physics – 01 – S

Patent

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G01S 13/42 (2006.01)

Patent

CA 2582321

The invention relates to an elevation estimation method and a radar apparatus of the stacked beam type using it. For the accurate determination of the elevation of a object, use is made of interpolation on the basis of object strengths, measured in the different beams. Thus, an object of this invention is a method for estimating an object's elevation comprising: Receptions and associated receiving processing of signal reflected by the object; A beam transformation of said processed received signals into a number of receiving antenna beams which are at least substantially identical in azimuth direction and distributed in elevation direction; An interpolation of the receiving antenna beams, which are provided with a mutual overlap, such as the object's elevation is deduced by standardisation of set of strengths measured along the elevation direction distribution and comparison to pre-defined sets of strengths which have been associated with elevations, the comparison determining a best fitting set. In order to make interpolation also possible for low-flying objects, at least one beam having a negative elevation is provided.

L'invention concerne un procédé servant à évaluer une élévation et un dispositif radar à faisceau étagé mettant ce procédé en application. Dans le but de déterminer avec précision l'élévation d'un objet, on utilise une interpolation basée sur les forces des objets mesurées dans les différents faisceaux. De ce fait, dans un mode de réalisation de l'invention, ce procédé consiste à : recevoir et traiter un signal réfléchi par l'objet ; transformer le faisceau desdits signaux de réception traités en plusieurs faisceaux d'antenne de réception au moins sensiblement identiques en direction d'azimuth et répartis en direction d'élévation ; déduire une interpolation des faisceaux d'antenne de réception, qui présentent un chevauchement réciproque, tel que l'élévation de l'objet, par standardisation d'un ensemble de forces mesurées le long de la répartition des directions d'élévation et comparaison à des ensembles prédéfinis de forces associées à des élévations, cette comparaison déterminant l'ensemble le mieux adapté. Un faisceau présentant une élévation négative est également présent, de manière à permettre également une interpolation pour des objets volant à basse altitude.

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