多测站激光测距中的时间同步方法研究

Time synchronization in multi-station laser ranging

为了减小测站间时间同步偏差对多测站激光测距的影响,提高空间碎片的测定轨精度,探讨了利用GPS共视法近实时地实现测站间高精度时间同步的方法。实验选取激光测站长春站(CHAL)和日本鹿儿岛站GUTS Masda(GMSL)进行时间同步实验,并用后处理的IGS精密钟差产品对计算结果进行了验证。该方法的时间同步精度达3 ns(RMSE),可满足多测站激光测距对时间同步精度的需求。

In order to reduce the influence of time synchronization deviation between observation stations on the multi-station laser ranging and improve the orbit-determination precision for space debris, we discussed a method based on GPS common view for realizing the high-precision time synchronization between stations almost in real time. The Changchun station （CHAL） and GUTS Masda station （GMSL） were chosen to conduct the time synchronization experiment, and the calculated results are compared with IGS clock-difference product. The result shows that the precision of time synchronization for this method is 3 nanoseconds, meeting the needs of multi-station laser ranging in time synchronization.