4 kHz重复频率卫星激光测距系统及其应用

4 kHz Repetition Rate Satellite Laser Ranging System and Its Application

分析了上海天文台皮秒激光器系统在不同重复频率下的输出功率、输出波形等性能,实现了重复频率为4 kHz、功率为3 W、波长为532 nm的激光稳定输出。建立了4 kHz重复频率卫星激光测距系统,实现了4 kHz重复频率卫星测距,其测量数据量和标准点数据精度比1 kHz重复频率的分别提高了约2.62倍和1.62倍,提升了卫星观测性能。采用Lomb算法获得了Ajisai卫星自转频率(平均值为0.4234 Hz)以及自转频率准确度(0.0054 Hz),与1 kHz激光观测系统相比,4 kHz重复频率卫星激光测距系统的卫星自转测定精度显著提升。

The picosecond-laser system at Shanghai Astronomical Observatory is analyzed and its performances,such as output powers and output waveforms,under different repetition rates are investigated.A stable laser output with repetition rate of 4 kHz,power of 3 W,and wavelength of 532 nm is realized.The 4 kHz repetition rate ranging system is established and the 4 kHz repetition rate satellite laser ranging is achieved.Compared with those for 1 kHz repetition rate,the amount of observation data and the precision of normal point data are increased by approximate 2.62 times and 1.62 times,respectively,which indicating the performance of satellite observation is improved.Moreover,the average spin rate of Ajisai satellite obtained by the Lomb algorithm is 0.4234 Hz with an accuracy of 0.0054 Hz,higher than those from the 1 kHz laser observation,and the measurement accuracy of satellite spin is also improved.