Space Station has various payloads, some of which may be replaced and the requirements on precision of time synchronization increase. The traditional time synchronization methods mainly include GPS seconds pulse and broadcast time code through MIL-STD-1553B bus. The former way has a higher precision than the latter one. However, using GPS pulse per second to realize time synchronization has to route for each payload, which makes it much difficult to extend; Time synchronization though MIL-STD-1553B offer only 25 microseconds of synchronization precision which can't meet the demand of some experimental payload. This paper, based on the FC-AE-1553 network that adopted by the application information system, proposes" a two-way high-precision time synchronization method and offset compensation mechanism, designed and implemented on the FPGA chips. The experimental results show that the single-stage time synchronization based on the FC-AE-1553 network is better than 50 nanoseconds when the synchronization cycle is 1 millisecond, which provides a time synchronization service for the high-precision experimental payload, and avoids the complicated mechanism of special routing for each payload. Improving the accuracy of the traditional method of bus broadcast time code effectively. This paper provides excellent performance solutions for the space station payload high-precision time synchronization service.
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