基于△DOR信号的高精度VLBI技术  

High-accuracy VLBI technique using △DOR signals

作　　者：吴伟仁 王广利[2] 节德刚 张秀忠[2] 蒋栋荣[2] 

机构地区：[1]探月与航天工程中心,北京100037 [2]中国科学院上海天文台,上海200030

出　　处：《中国科学：信息科学》2013年第2期185-196,共12页Scientia Sinica(Informationis)

基　　金：探月工程重大科技专项资助项目

摘　　要：在嫦娥二号(CE-2)工程中,我国首次开展了X波段?DOR测量实验,获取了?DOR信号的VLBI时延数据,并用于精密定轨.本文给出了CE-2中?DOR信号的VLBI测量与数据处理方法,结合我国VLBI测量系统对时延数据进行了误差分析及精密定轨分析.结果表明:?DOR信号的VLBI时延精度优于0.5 ns,比利用S波段信标的测量精度提高约一个数量级.本研究成果为后续的月球及深空探测高精度测定轨提供了重要的技术手段.During the Chinese Lunar Project Chang＇E-2 mission, a series of experiments on △DOR （delta differential one-way ranging） technology was carried out over a two week period starting on April 2, 2011. △DOR technology was first adopted in China deep space navigation, and the ADOR delay observables were obtained and used for orbit determination. In this paper, we introduce the ADOR observing technology, including the ADOR measurenmnt principles. We also discuss the experiment design, the rules for selecting the calibration quasars, the switching time choice, the signal recording setup for the channels, the △DOR data processing method implemented in the software, and our analysis of the error sources of the ADOR delay and its contribution to orbit determination based on the characteristics of the Chinese VLBI network. Through these analyses and verification studies on the orbit determination from the satellite orbits in the CE-1 and CE-2 missions, we conclude that the accuracy of the ADOR delay is about 0.5 ns, an improvement of about one order of magnitude compared with that from S-band telemetry signals of less than 1 MHz. This study presents an important technique for high precision orbit determination of lunar and deep space explorations.

关 键 词：嫦娥二号 VLBI技术 △DOR测量 误差分析 航天器导航设备 信号处理 

分 类 号：V476.3[航空宇航科学与技术—飞行器设计] V557