激光与光电子学进展, 2019, 56 (1): 011204, 网络出版: 2019-08-01   

基于光纤时间频率传递的多望远镜激光测距时间同步研究 下载: 1181次

Time Synchronization in Laser Ranging with Multi-Receiving Telescopes Based on Fiber-Time-Frequency Transfer
作者单位
1 中国科学院上海天文台, 上海 200030
2 中国科学院空间目标与碎片观测重点实验室, 江苏 南京 210008
3 中国科学院上海光学精密机械研究所, 上海 201800
摘要
多台望远镜同时进行信号接收可有效增加激光回波数,提升目标激光信号探测能力。多望远镜接收测量系统间的时间同步精度,直接影响测量数据误差。为此,提出了光纤时间频率传递在多望远镜测量系统中的时间频率同步方法,并测试了光纤时间频率传递系统的装置性能,其时间同步精度达62 ps,变化率每天约为4 ps,满足卫星激光测量要求。基于双望远镜信号接收激光测距系统及光纤时间频率传递装置,开展了单望远镜激光发射、双望远镜信号接收的卫星激光观测实验。与卫星精密轨道相比,双望远镜联合获得的卫星距离测量外符误差小于6 cm,可应用于卫星精密定轨。实验结果验证了光纤时间频率传递方法在多望远镜信号接收激光测距应用中的可行性。
Abstract
The number of laser echoes can be obviously increased with multi-receiving telescopes to simultaneously receive signals, and the detection ability of target laser signals can be enhanced. However, the precision of time and frequency synchronization directly influences the errors of laser ranging data by means of multi-receiving telescopes. Thus the time and frequency synchronization method for the laser ranging system with multi-receiving telescopes is described based on fiber-time-frequency transfer. The performance of a fiber-time-frequency transfer device is tested and the results show that its time synchronization precision is 62 ps and the linear slope is 4 ps a day, which meet the requirements of laser ranging to satellites. The experiments of laser ranging to satellites are performed with single-transmitting telescope and dual-receiving telescopes based on the laser ranging system with dual-receiving telescopes and the fiber-time-frequency transfer device. Compared with that of the precise orbits of satellites, the error of ranging data derived from the dual-receiving telescopes is less than 6 cm, indicating that it can be used for the precise orbit determination of satellites. Moreover, the experimental results confirm the application feasibility of the fiber-time-frequency transfer method in laser ranging with multi-receiving telescopes.

张海峰, 邓华荣, 龙明亮, 程志恩, 张忠萍, 赵罡, 王家亮. 基于光纤时间频率传递的多望远镜激光测距时间同步研究[J]. 激光与光电子学进展, 2019, 56(1): 011204. Haifeng Zhang, Huarong Deng, Mingliang Long, Zhien Cheng, Zhongping Zhang, Gang Zhao, Jialiang Wang. Time Synchronization in Laser Ranging with Multi-Receiving Telescopes Based on Fiber-Time-Frequency Transfer[J]. Laser & Optoelectronics Progress, 2019, 56(1): 011204.

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