Signal processing for ultra-wideband impulse radar

G - Physics – 01 – S

Patent

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Details

G01S 7/28 (2006.01) G01S 7/288 (2006.01) G01S 7/292 (2006.01) G01S 13/02 (2006.01) G01S 13/538 (2006.01)

Patent

CA 2157016

An ultra-wideband impulse radar system for use on an airborne platform includes circuitry (16) for coherently integrating the signals to improve signal-to-noise ratio so as to enhance the detection capability of the system, and for motion compensation of the signals to correct for inadvertent modulations of received signals due to buffeting or vibration of the airborne platform which may otherwise corrupt the filtering and signal integration processes. The inclusion of velocity filters and coherent integration despite the lack of phase information in the signals is accomplished by exploiting the time-delay properties of the received impulse signals, in which the observable pulse repetition frequency of the received signals differs from the transmitted pulse repetition frequency by virtue of the relative velocity between signal reflecting elements and the radar platform.

Un système radar à impulsions à bande ultra-large destiné à une plate-forme aéroportée comprend des circuits (16) permettant l'intégration cohérente des signaux afin d'améliorer le rapport signal/bruit et d'accroître les capacités de détection du système, et permettant également d'appliquer une compensation de mouvement aux signaux afin de rectifier les modulations fortuites des signaux reçus dues à la vibration ou aux secousses de la plate-forme aéroportée qui pourraient en d'autres circonstances altérer les processus de filtrage et d'intégration des signaux. On applique des filtres de vitesse et une intégration cohérente, en dépit de l'absence d'informations de phase dans les signaux, en exploitant les propriétés de temporisation des signaux d'impulsion reçus, la fréquence de répétition des impulsions observables des signaux reçus différant de la fréquence de répétition des impulsions transmises en vertu de la vitesse relative des éléments de réflexion de signaux et de la plate-forme radar.

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