嫦娥四号VLBI群时延跳变研究
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作者单位:

1.中国科学院上海天文台上海200030;2.中国科学院大学北京100049)

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P164;

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国家自然科学基金项目(11973074、11773060、11803069), 中国科学院射电天文重点实验室和上海市空间导航与定位技术重点实验室资助


The Study on the Group Delay Jumping of CE-4 VLBI System
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1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. University of Chinese Academy of Sciences, Beijing 100049;

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    摘要:

    相时延处理软件是嫦娥四号(CE-4)任务甚长基线干涉测量(Very Long Baseline Interferometry, VLBI)测轨分系统软件配置项之一, 利用其处理着陆巡视器X波段DOR (Differential One-way Ranging)信号时, 观测弧段(scan)内偶尔存在残余群时延跳变问题. 论文主要分为两部分: 一是根据VLBI信号接收和数据处理流程, 从相关相位、频率、幅度和功率方面进行分析, 最终将影响因素定位在昆明测站模拟信号异常; 二是以scan内时延跳变影响因素分析为基础, 通过修正异常基线相关相位, 研究残余群时延跳变事后改正方法, 并利用定轨软件验证其有效性, 升级了相时延处理软件.

    Abstract:

    The phase delay software is a key component of VLBI (Very Long Baseline Interferometry) orbit determination system in CE-4 mission, which is critical to deep space exploration. When processing X-band DOR (Differential One-way Ranging) signals of probes in the past, group delay jumping occasionally occurred in the observed scan. This paper consists of two parts. First, according to the VLBI station signal reception and VLBI center data processing steps, we analyzed the frequency, phase, power and self-correlation spectrum of the signal and located the influencing factor at the abnormal analog signal of Kunming (KM) station. Second, the group delay jumping was revised by the post-correction method which was based on the analysis of the abnormal unwrap phase. We used the corrected phase to get the new group delay and used orbit determination software to verify the effectiveness of the post-correction method which upgraded the phase delay processing software.

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蒋健华,刘庆会,郑鑫,邓涛.嫦娥四号VLBI群时延跳变研究[J].天文学报,2021,(2):1-12.

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  • 收稿日期:2020-05-10
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  • 在线发布日期: 2021-03-30
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