面向"CE-3号"软着陆过程的深空网干涉测量技术

Application of Interferometric Tracking by China DSN in CE-3 Soft Landing

摘要: 针对"CE-3号"探测器软着陆过程中弹道位置测定的问题,利用中国深空网干涉测量测轨数据,论述并验证了应用深空网干涉测量技术支持探月卫星软着陆过程中弹道位置测定的可行性。针对提取同一时刻观测量的两个核心技术,论述了自适应模型重构算法以及干涉相位解模糊算法,克服了软着陆过程航天器机动不确定性恶化轨道预报精度,进而引起相关引导模型失效的问题;利用跟踪过程中目标干涉相位连续特性递推实现干涉相位解模糊。实测数据的处理分析表明,深空网干涉测量数据处理分析精度在0.3 ns量级,对应于约30 nrad的角位置精度。

Abstract: This paper discussed the possibility of application of Interferometric tracking to track CE'3 during Soft Landing by China Deep Space Network. Algorithm of adaptive model reconstruction and interferometric phase unwrapping are discussed in details, which can avoid accuracy of predict orbit deteriorate caused by spacecraft maneuver and can keep interferometric phase continuous. Based on data analysis in project, the accuracy of the interferometric tracking is in the order of 0.3ns, which corresponds to 30nrad angular accuracy.