| 摘要: |
| 针对“嫦娥4号”中继星任务S频段信标信号的高精度实时干涉测量需求，结合深空测控干涉测量系统采用的稀疏标校工作模式，研究验证了一种面向测控模式实时干涉测量的电离层时延修正方法。首先分析了电磁波经电离层传播的延迟机理及特性；基于深空站历史观测数据，通过自相关函数分析验证了天顶向TEC的周日特性；在此基础上，结合深空干涉测量中心数据处理设备软件系统，讨论了电离层时延修正方法；通过任务期间的实测数据处理分析，验证了所提方法可以将实时测量精度提升1～3 ns，对低仰角跟踪弧段，该技术方法优势更为明显。该方法为后续深入推进深空测控干涉测量系统在任务中的实时应用提供了技术储备。 |
| 关键词: 干涉测量 深空网 电离层 TEC 嫦娥4号中继星 |
| DOI：10.15982/j.issn.2095-7777.2019.03.005 |
| 分类号:TN961 |
| 基金项目:国家自然科学基金资助项目（11603001，11833001） |
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| A Method of Ionosphere Delay Calibration in Real-Time Deep Space Interferometric Tracking |
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HAN Songtao1,2, XIE Jianfeng1, WANG Mei1, LI Li1
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1.National Key Laboratory of Science and Technology on Aerospace Flight Dynamics, Beijing Aerospace Control Center, Beijing 100094, China;2.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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| Abstract: |
| A method of ionosphere delay calibration is proposed for real time interferometric tracking with sparse calibration mode,in order to realize high accuracy tracking in Chang'E-4 relay satellite mission. The theory of ionosphere delay is analyzed, then, diurnal character of TEC (Total Electron Content) is testified with instrumental data observeded in deep space stations. Based on the above discussion,software in deep space interferometric tracking center is updated. Experimental result testifies the effectiveness of the method,where delay observable accuracy is improved by 1~3 ns,especially in low elevation angle case. The method in this paper benefits the application in real-time tracking with deep space stations. |
| Key words: interferometric tracking deep space network ionosphere TEC Chang'E-4 relay satellite |
