一种基于信道模拟的测速精度评估方法

A Method for Evaluation of Range Rate Measurement Accuracy Based on Channel Simulator

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。

A range rate measurement accuracy evaluation system was constructed based on satellite channel simulator to evaluate the dynamic measurement accuracy of one-way Doppler range rate measurement.Scenario simulation was performed for one-way Doppler range rate measurement of an in-flight satellite by binding satellite flight trajectory in a satellite channel simulator and using satellite channel simulator to add propagation delay and Doppler frequency to the uplink signal.O-C residual sequence analysis was done on the range rate measurement data obtained from the scenario simulation to get range rate measurement accuracy under dynamic measurement conditions.O-C residual sequence calculation method is given and the impact of clock offset on range rate measurement results in one-way Doppler range rate measurement system was analyzed.A simplified clock error correction method is presented.