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对于时分多址TDMA体制的通信系统,为了维持网络的正常运行,时间同步精度达到微秒级即可。如果系统除了通信功能之外,还需要提供较高精度的单向测距功能,则将对网络同步精度提出更高要求,如15m的测距误差要求时间同步精度达到50ns以内。因此,为了获得良好的定位性能,要求TDMA通信系统中各个成员间同步精度达到和保持尽量高的量级。本文介绍了有源往返校时(RTT)的工作原理,设计了基于卡尔曼滤波的系统精密时间同步算法,并在实际平台进行了验证,取得了预期效果。
For TDMA TDMA communication system, in order to maintain the normal operation of the network, the time synchronization accuracy can reach microseconds. If the system needs to provide one-way ranging with higher accuracy in addition to the communication function, the synchronization accuracy of the network will be set higher. For example, the ranging error of 15m requires that the time synchronization accuracy be within 50ns. Therefore, in order to obtain good positioning performance, it is required that the synchronization accuracy among the various members in the TDMA communication system is achieved and maintained as high as possible. This paper introduces the working principle of active back-to-school time (RTT), designs a system precise time synchronization algorithm based on Kalman filter, and verifies it on the actual platform, and achieves the expected result.