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深空网测控模式△DOR测量建模与精度分析

MODEL AND ANALYSIS OF ΔDOR TRACKING BY CHINA DSN WITH TT&C MODE

  • 摘要: 差分干涉测量技术是获取深空探测器高精度角位置信息的重要技术手段. 本文以中国深空网在嫦娥3 号(CE'3 号) 任务中首次应用为背景,论述深空网测控模式差分干涉测量技术的测量模型,相对于传统的短时交替观测模式,该方法能够全时段确保目标航天器的遥测、遥控通信,克服短时交替引起的航天器遥测信息中断以及应急遥控指令无法发送的问题. 基于CE'3 号环月轨道段的实测数据处理结果,通过与事后精密轨道的精度比对表明,测量数据时延精度在1 ns 量级,相应于角位置精度97 nrad(地月距离上CE'3 号位置精度37 m),与具有相似基线构型的采用短时交替模式的CVN 网测量精度在同等量级.

     

    Abstract: Very long baseline interferometry (VLBI) can provide accurate plane of sky measurement of spacecraft. Based on the first implementation of interferometric tracking in CE'3 project by China DSN (Deep Space Network), this paper describes modeling interferometric tracking with TT&C mode. Earth based stations keeps pointing to the spacecraft while it is in view of antenna. So interruption of TT&C signal can be eliminated, which is unavoidable with traditional short-scan working mode. Compared with high accuracy orbit ephemeris, delay observable error is less than 1ns which corresponds to an angular accuracy of about 97nrad (37m uncertainty at the Earth-Moon distance). Accuracy of delay observable is in the same order with CVN baseline which has the similar configuration.

     

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