System employing a direct digital synthesiser

Details System employing a direct digital synthesiser System employing a direct digital synthesiser

G - Physics

01

S

G01S 7/292 (2006.01) G01S 13/34 (2006.01) G06F 1/03 (2006.01) H03B 23/00 (2006.01)

Patent

CA 2744567

A DDS based system, such as a radar, includes means for generating a plurality of transmission signals using a DDS, and means for integrating signals derived therefrom, such as received signals. The system further includes means for varying the relative starting phase of the plurality of transmission signals, or adjusting the DDS input clock whilst maintaining similar primary output frequency characteristics of the transmission signals. The approach has the effect of changing the location of unwanted frequency spurs in each of the transmission signals, and hence the effects of these are decreased in the integration process. An improvement in the sensitivity of the system results. Although primarily suited to radar applications the invention may find utility in other systems such as sonar or lidar systems.

Système à synthétiseur numérique direct (DDS), tel quun radar, comportant un moyen conçu pour générer une pluralité de signaux de transmission à laide dun DDS, et un moyen conçu pour intégrer des signaux issus de ceux-ci, tels que des signaux reçus. Le système comprend en outre un moyen conçu pour faire varier la phase relative de départ de la pluralité de signaux de transmission, ou pour régler lhorloge dentrée du DDS en faisant en sorte que les caractéristiques principales de la fréquence de sortie des signaux de transmission restent similaires. Cette démarche a pour effet de modifier la position de fréquences parasites indésirables dans chacun des signaux de transmission, et de réduire ainsi leurs effets dans le processus dintégration. La sensibilité du système sen trouve donc améliorée. Si linvention convient idéalement aux applications radar, elle peut également trouver une utilité dans dautres systèmes, notamment les systèmes sonar ou lidar.

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