中国空间科学技术

中国空间科学技术 ›› 2022, Vol. 42 ›› Issue (2): 91-98.doi: 10.16708/j.cnki.1000-758X.2022.0026

• 论文 • 上一篇    下一篇

一种用于深空导航定位的新型DOR信标

甘江英，舒逢春，吴亚军，童锋贤，郭绍光，吴徳   

  1. 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
  • 出版日期:2022-04-25 发布日期:2022-03-30

A novel DOR beacon for deep space navigation and positioning

GAN Jiangying, SHU Fengchun, WU Yajun, TONG Fengxian, GUO Shaoguang, WU De   

  1. 1Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Published:2022-04-25 Online:2022-03-30

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摘要： 甚长基线干涉测量（VLBI）是深空探测器导航定位的重要手段之一，深空探测器的VLBI观测通常采用差分单程测距（DOR）信标和双差单程测距（DeltaDOR）测量体制，精确地测量深空探测器相对于河外射电源的角距。相位杂散是影响DeltaDOR测量精度的主要误差源之一，针对这项误差研究了一种基于伪随机噪声调制方式的新型DOR信标（PNDOR），开展了信标的设计实现，从时域和频域角度分析了Gold码带宽及多项式、整形滤波系数和DOR信号调制指数的优化方法。 PNDOR信标可有效削弱相位杂散效应，提高DeltaDOR测量精度，满足中国未来深空探测任务高精度导航定位需求。

关键词: 甚长基线干涉测量（VLBI）, 双差单程测距（DeltaDOR）, DOR信标, 相位杂散, 深空导航

Abstract: Very long baseline interferometry (VLBI) is one of the important approaches of navigation and positioning of deep space probes. The differential one-way ranging (DOR) beacons and delta differential one-way ranging (Delta-DOR) measurement systems, which accurately determine the angular distance of the deep-space detector with respect to the extraterrestrial radio source, are often used in VLBI observations of deep space probes. Phase dispersion is one of the main sources of error that reduce the accuracy of measurement. A new DOR beacon (PN-DOR) was developed based on the pseudorandom noise modulation method and the design and implementation of the beacon were carried out. Moreover, the optimization methods of the Gold code bandwidth, polynomials, the shaping filters coefficients and the DOR signal modulation index were analyzed in the time and frequency domain. The PN-DOR beacon can effectively reduce the delay error induced by phase dispersion and improve the Delta-DOR measurement accuracy, thus meeting the needs of high-precision navigation and positioning of future deep-space probe missions of China.

Key words: very long baseline interferometry (VLBI), delta differential oneway ranging (Delta-DOR), DOR beacon, phase dispersion, deep space navigation