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为了评估单向多普勒测速动态测量精度,构建了一种基于卫星信道模拟器的测速精度评估系统,通过在卫星信道模拟器装订卫星飞行轨迹,利用卫星信道模拟器对上行信号加入传播时延、多普勒频率,对卫星在轨飞行状态下的单向多普勒测速进行场景仿真,并对场景仿真获取的测速数据进行O-C残差序列分析,得到动态测量条件下的测速精度。给出了O-C残差序列的计算方法,分析了单向多普勒测速体制下时钟偏差对测速结果的影响,并给出了一种简单的时钟误差修正方法。
In order to evaluate the dynamic measurement accuracy of one-way Doppler velocimetry, a speed measurement accuracy evaluation system based on satellite channel simulator was constructed. By simulating the satellite flight path in the satellite channel simulator and using the satellite channel simulator to add the propagation delay to the uplink signal , Doppler frequency, and simulate the one-way Doppler velocimetry in orbit orbit of the satellite. The OC residual sequence analysis of the velocity data obtained from the scene simulation is performed to obtain the velocity accuracy under the condition of dynamic measurement. The calculation method of O-C residual sequence is given, and the influence of clock deviation on speed measurement result under unidirectional Doppler velocimetry is analyzed. A simple method of clock error correction is given.