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鉴于我国深空测控网的深空干涉测量系统在探月三期再入返回飞行试验中首次正式执行任务,北京深空干涉测量中心组织佳木斯、喀什深空站对再入返回飞行试验器进行了高精度干涉测量。针对深空站天线无法短时交替观测射电源,从而无法进行干涉测量系统差标校的问题,利用基于稀疏标校数据平滑内插、高精度钟差建模、环境参数时延补偿的数据综合处理策略,实现了干涉测量系统差高精度标校。利用飞行试验器VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)信标下行信号进行干涉测量获取时延观测量,用于飞行试验器联合定轨。联合定轨残差结果表明,深空网干涉测量时延测量精度在1ns水平,对应约100nrad测角精度,可以为飞行试验器精密定轨提供高精度测量数据支持。
In view of the deep space interferometry system of China’s deep space monitoring network for the first time in the lunar exploration and return flight test for the first time to perform the task, Beijing deep space interferometry center organization Jiamusi, Kashi deep space station on the reentry flight tester High-precision interferometry. Because the deep space station antenna can not observe the radio source alternately for a short time, the problem of poor calibration of the interferometry system can not be solved. The data synthesis based on the sparse calibration data smoothing interpolation, high precision clock error modeling and environmental parameter delay compensation Processing strategy to achieve a high precision interferometry system standard calibration. Interferometry was performed using the Beacon Baseline Interferometry VLBI (Very Long Baseline Interferometry) interferometry to obtain the time delay observations for combined flight orbit determination. The results of joint orbit determination show that the accuracy of deep space network interferometry time delay measurement is about 1ns, which corresponds to the accuracy of about 100nrad. It can provide high precision measurement data support for the precision orbit determination of flight test instrument.