A combined earth-star sensor system and a method for...

G - Physics – 01 – C

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G01C 21/24 (2006.01) B64G 1/36 (2006.01) G05D 1/08 (2006.01)

Patent

CA 2346462

A combined earth-star sensor system (1) for three-axis attitude determination of satellites in space comprises separate apertures with different directions of observation and common image pickup devices (4) for the earth sensor and the star sensor. A common optical arrangement (2) for earth observation and star observation, and a deflection mirror (3) for deviation of the laterally entering light from the earth, to the common optical arrangement (2) may be provided. In one focal plane there is a focal plane sensor with an array of image pickup devices (4) with the integration time being controllable. An evaluation unit determines the orbit and the attitude of the space vehicle from the attitude and movement of the stars and of the rim of the earth in the focal plane.

Système capteur (1) de terre-stellaire combiné pour la détermination à trois axes de la position de satellites dans l'espace, qui possède des ouvertures séparées avec des directions d'observation différentes et des appareils communs de prise de vues (4) pour le capteur de terre et pour le capteur stellaire. Ledit système peut comporter un dispositif optique commun (2) pour l'observation de la terre et des étoiles et un miroir de déviation (3) destiné à la déviation de la lumière terrestre entrant latéralement sur le dispositif optique commun (2). Dans un plan focal se trouve un capteur de plan focal doté d'un ensemble d'appareils de prise de vues (4), la durée d'intégration étant réglable. Une unité d'évaluation détermine, sur la base de la position et du mouvement des étoiles et de l'horizon terrestre dans le plan focal, la trajectoire et la position de l'engin spatial.

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