Frequency error correction in a satellite-mobile...

H - Electricity – 04 – B

Patent

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Details

H04B 7/185 (2006.01) H03J 7/02 (2006.01) H04B 7/01 (2006.01) H04B 7/208 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2174938

Mobile stations correct their frequencies using a signal received from the moving relay station including correction of any Doppler shift caused by the satellite's movement. The mobile station includes a receiver for receiving a paging channel signal broadcast by the moving relay station and demodulators and decoders for decoding the information in the paging channel signal. Using the decoded information, the mobile station can determine an estimate of its position within the communication system. The mobile station can also determine a frequency error and a Doppler shift using the decoded information and the position estimate. A frequency controlling signal is determined using the determined frequency error and the Doppler shift. A controlled reference oscillator then uses the frequency correcting signal as a control input signal. Finally, the mobile station contains a transmitter for transmitting a signal using the voltage controlled oscillator as a reference.

Des stations mobiles peuvent corriger leur fréquences à l'aide d'un signal reçu d'une station relais mobile et procéder à la correction de tout décalage Doppler du au mouvement du satellite. La station mobile comporte un récepteur recevant une émission sur un canal de recherche provenant de la station relais mobile, et des démodulateurs et décodeurs pour décoder les informations y étant contenues. A l'aide des informations décodées, la station mobile peut évaluer sa position dans le système de télécommunications. La station mobile peut également déterminer l'erreur de fréquence et le décalage Doppler à l'aide des informations décodées et de l'évaluation de position. Un signal de commande de fréquence est déterminé à l'aide de l'erreur de fréquence déterminée et du décalage Doppler. Un oscillateur de référence commandé utilise ensuite le signal de correction de fréquence comme signal d'entrée de commande. Enfin, la station mobile comporte un émetteur destiné à émettre un signal utilisant comme référence l'oscillateur commandé en tension.

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