| 摘要 |
The present invention relates to a method of synchronizing CDMA processing in a satellite communication system connecting multi-point ground stations. The method is comprised of the steps of acquiring access and synchronization signals transmitted by a satellite at a terrestrial subscriber unit, setting a reference propagation delay time, and establishing a propagation delay in terms of arrival of a message in relation to one of a plurality of quantified timing marks subsequent to the reference propagation delay time, when the satellite receives a first signal from the terrestrial subscriber unit on an access channel. The method further comprises the steps of conveying the established quantified propagation delay to the terrestrial subscriber unit, adjusting timing of uplink CDMA code chips at the terrestrial subscriber unit from the original reference propagation delay derived from the access channel, tracking synchronizing by adjusting code delay of the uplink arrival time of a reference code, and retaining synchronization by downlink code delay transmission.
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