用于VLBI测轨的PN-DOR信标研究  

Rearch on PN-DOR Beacon Used in the VLBI Orbit

作　　者：陈奥 童力[2,3,4] 王瑞 郑为民[2,3,4] CHEN Ao;TONG Li;WANG Rui;ZHENG Wei-min(School of Communication and Information Engineering,Shanghai University,Shanghai 201900,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;National Basic Public Science Data Center,Beijing 100190,China;Shanghai Key Laboratory of Space Navigation and Positioning Techniques,Shanghai 200030,China)

机构地区：[1]上海大学信息与通信工程学院,上海201900 [2]中国科学院上海天文台,上海200030 [3]国家基础学科公共科学数据中心,北京100190 [4]上海市空间导航与定位技术重点实验室,上海200030

出　　处：《天文学进展》2023年第4期569-580,共12页Progress In Astronomy

基　　金：国家自然科学基金(11973011);国家基础科学数据共享服务平台(DKA2017-12-02-09);中科院关键技术人才;上海市领军人才;上海天文台重点培育项目。

摘　　要：探测器DOR信号与射电源信号频谱特征不同引起的接收设备相位波动误差是月球和深空探测VLBI测轨的重要误差源之一。新型PN-DOR信标通过使用伪随机序列对现有DOR信标扩频调制生成,实现与射电源信号相似的频谱特征,可有效降低相位波动误差。研究PN-DOR信标在VLBI测轨应用中相位误差与带宽综合群时延误差计算方法,在此基础上通过比较相同发射功率条件下PN-DOR与DOR信标总时延误差,分析PN-DOR的适用条件。Phase fluctuation error is one of the important errors of VLBI orbit system in the lunar exploration and deep space exploration.It is caused by the different spectrum structure of DOR and radio source signal,which leads to the inconsistency of phase fluctuation of receiving equipment.The novel PN-DOR beacon realizes the spectrum structure similar to the radio signal through the spread spectrum modulation of the existing DOR beacon by the pseudo random sequence,which can effectively reduce the phase fluctuation error.This paper studies the calculation methods of phase error and bandwidth synthesis group delay error of PN-DOR beacon in VLBI orbit measurement.On this basis,by comparing the total delay error of PN-DOR and DOR beacon under the same transmission power,the applicable condition of PN-DOR is analyzed.

关 键 词：VLBI PN-DOR信标 相位误差 群时延误差 

分 类 号：P228.6[天文地球—大地测量学与测量工程]