空间探测中动态运动对双向时间交换测距的影响

Impact of Dynamic Motion on TWSTT Ranging Performance in Space Exploration

为了提高动态运动条件下双向时间交换测距(TWSTT)的精度,满足航天器间高精度自主测量的需要,在传统相对静止模式的基础上,分析了空间探测中目标间动态运动对双向时间交换测距的影响,针对两种典型的运动场景,分析了相对运动影响测距的机理,推导了动态运动条件下的距离解算公式。分析和仿真结果表明:相比传统静止模式,动态条件下的距离解算增加了目标间的相对速度、运动方向及相对距离等影响因素,如果在距离解算时忽略了上述因素,则将引入相应的测距误差,而且相对运动速度越大、相对距离越远,引入的测距误差越大。

To improve the accuracy of two-way satellite time transfer（TWSTT） ranging in dynamic motion scenarios and satisfy the requirement of inter-spacecrafts＇ automatic measurement, the impact of dynamic motion on the performance of TWSTT ranging is discussed according to the static ranging principle. For two typical dynamic motion scenarios,the principle of the dynamic motion impacting on the TWSTT ranging is analyzed, and the corresponding ranging equations are deduced. The analysis and simulation results show that compared with the relative static scenario, the velocity and direction of the motion and the distance be- tween the objects must be considered in the dynamic TWSTT ranging calculation. If above parameters are ignored, the calculation error will be involved, and it would become larger with the increasing of velocity and distance.