Delay compensated doppler radar altimeter

G - Physics – 01 – S

Patent

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Details

G01S 13/90 (2006.01) G01S 7/40 (2006.01) G01S 13/10 (2006.01) G01S 7/288 (2006.01) G01S 13/88 (2006.01)

Patent

CA 2265448

A delay compensated Doppler radar altimeter which elimitates the relative delay curvature associated with the energy reflected by a scatterer (x3, x2, x n) located in the along-track direction of an aerial platform (10) for which a most accurate estimation of scatterer elevation is desired. By Doppler shifting each return, the range indicated for each scatterer over its illumination history is equal to the minimum range x h experienced when the relative velocity between the aerial radar (10) and the ground is effectively zero. Compensating each signal so that its entire along-track history can be used for elevation estimation leads to an advantage of more than 10dB in gain improvement over existing systems, and less degradation from surface topography (13).

Altimètre radar Doppler à compensation de retard, qui élimine la courbe de retard relatif associée à l'énergie réfléchie par un diffuseur (x3, x2, xn) situé dans la direction longitudinale d'une plate-forme aérienne (10), pour lequel on désire une estimation plus précise de l'altitude. Par décalage Doppler de chaque écho, la portée indiquée pour chaque diffuseur sur son historique d'illumination est égale à la portée minimale xh obtenue quand la vitesse relative entre le radar aérien (10) et le sol est réellement nulle. La compensation de chaque signal, de façon que la totalité de son historique longitudinal puisse être utilisée pour l'estimation de son altitude, amène un avantage de plus de 10 dB dans l'amélioration du gain par rapport aux systèmes existants et provoque moins de dégradation depuis la topographie de surface (13).

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