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时间同步是分布式控制系统应用的关键技术之一.本文根据某分布式控制系统实际要求,提出了一种具有纳秒级时间同步精度的实现方法,并通过理论计算和部分实际测试结果,验证了方法的可行性.“,”Time synchronization is one of the key technologies in distributed control system. According to the requirements of a distributed control system, an implementation of time synchronization with nanosecond precision is presented. The theoretical calculation and the actual test results have proved that the method is feasible.