Methods and apparatus for conversion or radar return data

G - Physics – 01 – S

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Details

G01S 13/53 (2006.01) G01S 7/292 (2006.01) G01S 13/524 (2006.01) G01S 13/90 (2006.01) G01S 13/95 (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 2485740

An in-phase/quadrature component (IQ) mixer (306) is configured to reject returns from a negative doppler shift swath in order to mitigate corruption of returns of a positive doppler shift swath. The mixer includes a sample delay element (330) which produces a quadrature component from the in-phase component of an input signal. Further included are a plurality of mixer elements (322, 332), a plurality of low pass filters (324, 334), a plurality of decimators (326, 336), and a plurality of all pass filters (328, 338) which act upon both the in-phase and quadrature components of the input signal. Also, a subtraction element (340) is included which is configured to subtract the filtered and down sampled quadrature component from the filtered and down sampled in-phase component.

L'invention concerne un mélangeur (306) à composante en phase/quadrature (IQ) conçu pour rejeter les échos d'une bande de décalage Doppler négatif, afin de limiter l'altération d'échos d'une bande de décalage Doppler positif. Ce mélangeur comprend un élément (330) de retard d'échantillonnage, qui génère une composante en quadrature à partir de la composante en phase d'un signal d'entrée, ainsi qu'une pluralité d'éléments mélangeurs (322, 332), une pluralité de filtres passe-bas (324, 334), une pluralité de réducteurs (326, 336), une pluralité de filtres passe-tout (328, 338) agissant à la fois sur les composantes en phase et sur les composantes en quadrature du signal d'entrée. Ledit mélangeur comporte également un élément de soustraction (340) conçu pour soustraire la composante en quadrature filtrée et soumise à réduction de la composante en phase filtrée et soumise à réduction.

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