协同数据链的高精度时间同步设计

鉴于Link16中的RTT时间同步精度为百纳秒级别，针对其精度不高和需要GPS进行初始粗同步的缺点，本文分析了双向比对时间同步的各误差项，给出了各项误差消除或减小方法，最终能实现优于10 ns的时间同步精度，并首次提出不需要其它导航源进行初始粗同步的自主RTT算法。最后，在协同数据链动态自组织组网的需求下，对动态时隙分配时的RTT算法进行了分析，计算出对基准频率源的准确度要求，保证了改进算法在动态时隙分配时也能达到10 ns的精度。

Design of Accurate Time Synchronization in Coordination Data-link

The time synchronization accuracy of RTT in Link16 is at the hundred-nanosecond level. F or its lack of accuracy and need of GPS for initial preliminary synchronization, this paper analyzes each deviation term of RTT time synchronization, and presents each deviation eliminating or decreasing method, and finally achieves a time synchronization accuracy of less than 10 ns. Besides, this paper, for the first time, presents an independent RTT algorithm which does not need other navigation sources for initial preliminary synchronization. At last, under the requirement of dynamic self-organized networking of Weapon Coordination Data-link, this paper analyzes the RTT algorithm during dynamic time slot allocation process, and figures out the accuracy requirement of the benchmark frequency source, which assures that the improved algorithm could achieve the accuracy of 10 ns during dynamic time slot allocation process.