Applications of Delta Differential One-way Ranging (ΔDOR) to Lunar Exploration Program
-
摘要: 相对差分单向测距(ΔDOR)是一种高精度测角技术, 在深空探测任务的高精度测定轨方案中得到广泛应用. 介绍了ΔDOR测量的基本原理及CCSDS (国际空间数据系统委员会)关于ΔDOR测量的相关标准. 针对中国探月工程月面软着陆任务提出的高精度测定轨要求, 分析了ΔDOR测量的信号形式、工作模式以及测量精度, 推导了解模糊过程. 研究表明,ΔDOR测角精度达到25nrad, 对应到月球上的距离约为10m.Abstract: Delta Differential One-way Ranging (ΔDOR) is used for high precision angle measurement in many deep space exploration programs. The fundamentals of ΔDOR are introduced. Also, recommendations about ΔDOR of CCSDS (Consultative Committee for Space Data System) are presented. According to the high precision and real-time navigation requirements, the ΔDOR measurement schemes are designed for China's lunar exploration program whose current object is soft-land on the moon. The angle measurement precisions are analyzed in terms of the current performances of on-board and ground TT&C equipments. The resolution of the cycle ambiguity is presented. Research results show that the angle measurement precision is 25 nrad, which corresponds to about 10m on the moon. Further, the cycle ambiguity of DOR measurements can be resolved correctly.
点击查看大图
计量
- 文章访问数: 2592
- HTML全文浏览量: 61
- PDF下载量: 1109
- 被引次数: 0