Methods and apparatus for resolution of radar range ambiguities

Details Methods and apparatus for resolution of radar range ambiguities Methods and apparatus for resolution of radar range ambiguities

G - Physics

01

S

G01S 13/524 (2006.01) G01S 7/292 (2006.01) G01S 3/48 (2006.01) G01S 13/18 (2006.01) G01S 13/20 (2006.01) G01S 13/28 (2006.01) G01S 13/42 (2006.01) G01S 13/70 (2006.01) G01S 13/88 (2006.01) G01S 13/94 (2006.01)

Patent

CA 2485719

A method for resolving radar range ambiguities is disclosed, where the radar is modulated with a phase code which comprises a number of chips. The method includes acquiring (674) a radar return within a verify gate, the verify gate being aligned with one chip of the phase code, determining an amplitude (676) of the return, stepping (678) the gate outbound to a next chip of the code, acquiring a return, and determining (680) if the return has an amplitude greater than a threshold based on the original return. The verify gate is repeatedly stepped outbound to determine if a chip can be found which has an amplitude in excess of the threshold or until returns from all chips within the phase code have been acquired. If such a position is found, search logic of the radar is moved outbound to the chip position which had the highest amplitude return, if not the original chip position and the entire process begins again.

L'invention concerne un procédé pour résoudre des ambigüités de portée radar, le radar étant modulé avec un code de phase comprenant plusieurs de bribes. Le procédé consiste à: acquérir (674) un écho radar à l'intérieur d'une porte de vérification alignée avec une bribe du code de phase; déterminer une amplitude (676) de l'écho; faire progresser (678) la porte vers une bribe suivante du code; acquérir un écho; et déterminer (680) si l'écho a une amplitude supérieure à un seuil fondé sur l'écho initial. La progression de la porte de vérification est poursuivie de façon répétée pour déterminer s'il est possible de trouver une bribe dont l'amplitude dépasse le seuil, ou jusqu'à ce que les échos émanant de toutes les bribes du code de phase aient été acquises. Si une telle position est trouvée, la logique de recherche du radar est mise en mouvement vers la position de la bribe ayant l'écho d'amplitude le plus élevé ou, dans le cas contraire, vers la position de la bribe initiale; puis l'ensemble du processus est repris.

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