Satellite communication network time synchronization method based on centerless TDMA

Abstract

The invention relates to a satellite communication network time synchronization method based on centerless TDMA, which comprises the following steps of: firstly, when a network is initialized and a synchronization time slot is allocated, a round-trip timing message length, the maximum satellite-ground propagation time delay and a round-trip timing response message sending time interval designed for reducing a network synchronization error are comprehensively considered; secondly, after receiving a round-trip timing inquiry message sent by a ground node, a satellite node repeatedly sends a round-trip timing response message containing the sending time; and finally, the ground node can calculate a satellite-ground synchronization time error according to the received two round-trip timing response information messages, so that accurate time synchronization of the ground node and the satellite node is realized. According to the time synchronization method provided by the invention, the asymmetry of satellite-ground round-trip transmission time delay and the influence of satellite-ground long-distance transmission time delay on network synchronization are comprehensively considered, sothat the centerless TDMA network realizes accurate synchronization under the condition of satellite-ground long-distance communication.

Description

technical field [0001] The invention relates to a time synchronization method for a satellite communication network based on a centerless TDMA, which can be applied to a satellite TDMA communication system and belongs to the technical subject field of communication. Background technique [0002] In order to realize the real-time sharing of information elements among members, tactical communication is usually networked in a non-center TDMA working mode, and each member works synchronously according to a unified system time base, and the exchange between users does not need to be controlled and relayed by the central station. Thus forming a communication network without a central node. In addition, assign a platform with a higher time quality level as the network time reference. When a terminal fails, it will not affect the entire network. Even if the network time base fails, the entire network can work normally within a certain period of time, and then the pre-designated sta...

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Problems solved by technology

If the distributed TDMA network synchronization method is applied to the satellite communication network, the long distance of satellite-ground communication will lead to slow convergence of the synchronization process and high computational cost

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