Multichannel interferometer with phase generated carrier...

H - Electricity – 04 – L

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H04L 27/00 (2006.01) G01B 9/02 (2006.01) G01D 5/353 (2006.01) H04L 27/20 (2006.01) H04L 27/22 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2414257

Apparatus for eliminating sign uncertainty in a coherent phase generated carrier demodulator in a multi-channel sensor system has a downconverter array arranged to separate the in-phase component I and the quadrature phase component of the sensor output for each channel. A coordinate transformer uses the in-phase component and quadrature phase component to calculate an arctangent for the phase angle for each channel. A digital signal processor adds 180~ to each arctangent circulation for which the tangent is a negative number.

La présente invention concerne un appareil permettant d'éliminer une incertitude de signe dans un démodulateur de porteuse générée par phase cohérente, dans un système de détection multivoie. Cet appareil comprend un ensemble convertisseur-abaisseur de fréquence, qui est conçu pour séparer la composante I en phase et la composante en quadrature de phase de la sortie de détecteur pour chaque voie. Un système de transformation de coordonnées utilise la composante en phase et la composante en quadrature de phase afin de calculer une arctangente pour l'angle de phase de chaque voie. Un processeur de signal numérique ajoute 180· à chaque calcul d'arctangente pour lequel la tangente est un nombre négatif.

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