Satellite beam-pointing error correction in digital...

H - Electricity – 04 – B

Patent

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H04B 7/185 (2006.01) H04B 7/06 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2679289

A digital method of determining and correcting beam-pointing for a communications spacecraft that has a digital beam-forming architecture for defining multiple spot transmit and receive beams, the antenna system of the spacecraft including a receive antenna (DRA, AFR) having antenna elements providing respective antenna element signals, and wherein at least one of the uplink signals to the spacecraft includes a beacon signal, and wherein the method comprises digitally weighting components of said beacon signal present in antenna element signals, combining such weighted beacon signal components such as to derive beam-pointing error signals, and employing the error signals to adjust beam-forming weight values of the receive antenna, in order to adjust the pointing direction of at least one signal beam.The digital weights for the beacon signal define difference radiation patterns for x, y axes of the antenna which vary rapidly in a range corresponding to the pointing errors most commonly occurring.

L'invention concerne un procédé numérique de détermination et de correction de pointage de faisceau pour un engin spatial de communication qui présente une architecture de formation de faisceau numérique permettant de définir des faisceaux d'émission et de réception en pinceaux multiples, le système d'antenne de l'engin spatial comprenant une antenne de réception (DRA, AFR) présentant des éléments d'antennes fournissant des signaux d'éléments d'antennes respectifs, au moins un des signaux de liaison montante vers l'engin spatial comprenant un signal de balise, le procédé consistant à pondérer numériquement des composantes dudit signal de balise présent dans des signaux d'éléments d'antennes, à combiner lesdites composantes de signaux de balise pondérées de manière à dériver des signaux d'erreur de pointage de faisceau, et à utiliser les signaux d'erreur afin d'ajuster les valeurs de pondération de formation de faisceau de l'antenne de réception, de manière à ajuster la direction de pointage d'au moins un faisceau de signaux. Les pondérations numériques du signal de balise définissent des diagramme de rayonnement de différence pour les axes x, y de l'antenne qui varient rapidement dans une plage correspondant aux erreurs de pointage se produisant le plus communément.

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