一种基于信道模拟的测速精度评估方法

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

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.