北斗导航系统卫星激光测距综述（英文）

作者：ZHANG Haifeng; LONG Mingliang; YANG Huafeng; MENG Wendong; CHENG Zhi'en; DENG Huarong; ZHANG Zhongping; ZHANG A'li

来源：Aerospace China, 2020, 21(04): 31-41.

Satellite laser ranging(SLR) is an unambiguous measurement technique and generates high accuracy satellite orbit data. All satellites in the BeiDou navigation satellite system(BDS) carried laser retro-reflector arrays(LRAs), so they can be tracked by ground SLR stations in order to provide the accurate observation data. The Shanghai astronomical observatory(SHAO) designed the LRAs, and also developed the dedicated SLR systems using a 1 m-aperture telescope and a transportable cabin-based SLR system with a telescopes of 60 cm aperture. These enable BDS satellite ranging during daytime and nighttime with centimeter-level precision, allowing highly accurate estimations of satellite orbits. Moreover, some of the BDS satellites are also equipped with laser time transfer(LTT) payloads, which were developed by the SHAO and China Academy of Space Technology(CAST), providing a highly accurate time comparison between the satellites and ground clocks. This paper describes the dedicated SLR system and the design of the LRAs for BDS satellites, as well as global SLR measurements. The SLR tracking data is used for evaluating the orbit accuracy of BDS satellites and broadcast ephemeris, with an accuracy of less than 1 m. The LTT measurements to BDS satellites for a single shot have a precision of approximately 300 picoseconds, with a time stability of 20 picoseconds in 500 s.

• 单位
  中国科学院