Satellite laser ranging at 10 kHz repetition rate in all day
投稿时间:2019-12-08  修订日期:2020-09-05  download
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龙明亮 上海天文台 
张海峰 上海天文台 
门琳琳 上海天文台  
吴志波 上海天文台  
邓华荣 上海天文台  
秦思 上海天文台  
张忠萍 上海天文台 
Abstract:High-repetition laser ranging improves the sampling frequency of space targets, which is better to analyze attitude and orbit for space targets,and the high-performance laser source and noise suppression are the key to improve the high-repetition satellite laser ranging ability. Based on the satellite laser ranging (SLR) system at Shanghai Astronomical Observatory,the laser output energy was increased by using the 885 nm end-pumped Nd:YAG amplification. Each pulse of 10 kHz was obtained near-equal amplitude by controlling the pump gain current,Nd:YAG crystal cool water temperature and building time of regeneration amplification. An average power of 6 W picosecond laser in a wavelength of 532 nm was obtained at a repetition rate of 10 kHz with the divergence angle of 0.6mrad,pulse width of 30 ps, a beam quality M2 of 1.2. The noise levels for single photon detector at each repetition rate of 1 kHz, 2 kHz, 4 kHz, 5 kHz, 6.25 kHz,and 10 kHz was measured and analyzed respectively.The relationship between the false alarm probability and the ranging gating is obtained. The relationship between the number (N) of noise photons and the repetition rate (f) is N=743784.76. +431.08f, and the relationship between the false alarm detection probability (P) and the ranging gated (Δt) at the repetition rate of 10 kHz is P(Δt)=1-e-5054584.76×Δt , and also the function of the number of laser echoes with noise,laser energy and repetition are obtained,which is beneficial to design the SLR system.Therefore,it realizes the satellite laser ranging in all day, and the farthest distance was to the synchronous orbit of Beidou Compassi6b satellite.
keywords:Satellite laser ranging  10kHz repetition rate  noise measurement  single photon detection  synchronous orbit  
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Copyright:《Journal of Infrared And Millimeter Waves》