多脉冲激光的微弱信号探测能力分析研究  

Research on weak signal detection ability for burst-pulses laser

作　　者：门琳琳 龙明亮 张海峰[1,3] 邓华荣[1] 吴志波[1,3] 张忠萍[1,3] MEN Lin-lin;LONG Ming-liang;ZHANG Hai-feng;DENG Hua-rong;WU Zhi-bo;ZHANG Zhong-ping(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Space Object and Debris Observation,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[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 [3]中国科学院卫星与碎片观测重点实验室,江苏南京210008

出　　处：《激光与红外》2020年第5期557-562,共6页Laser & Infrared

基　　金：国家自然科学基金项目(No.U1631240,No.11503068);亚毫米精度卫星激光反射器关键特性的研究及其应用项目(No.11903066)资助。

摘　　要：激光测距雷达方程分析表明,多脉冲的包络总能量与脉冲能量相等单脉冲具有相同的测距能力。由偏振分束,增加两路光的光程,再由偏振合束的方法以及根据再生放大的特性,实现单个脉冲、双脉冲、四脉冲的2 kHz重复频率及等功率的532 nm皮秒多脉冲输出,以上海天文台千赫兹卫星激光测距系统为平台,实现各多脉冲下的卫星激光测距。分析卫星回波的有效点数,以及各脉冲的回波叠加后的精度,结果表明各输出方式的有效回波点数基本接近,精度与单脉冲的误差小于1 mm,验证了多脉冲总能量与脉冲能量相等单脉冲具有相同的测距能力。多脉冲相对单脉冲能够更好地提高整个脉冲包络的能量,增大激光测距的脉冲发射能量,有利用微弱信号激光的探测。The total energy of the burst-pulses has the same ranging capability as the pulse energy equal to the single pulse from laser ranging radar equation.The single-pulses,double-pulses and four-pulses in burst-pulses at 2 kHz repetition rate are obtained respectively with the optical beam splitting by the beam of polarization and regenerative amplification,and the single pulse and burst-pulses have the same average power.Based on the kilohertz satellite laser ranging(SLR)system of the shanghai observatory,single pulse and burst-pulses for SLR are realized obtained respectively.The effective points from SLR′s echo and the precision of single pulse and the echo superposition for and burst-pulses are analyzed.The results show that the echo points for single pulse and burst-pulses are close to each other,the error of the precision was less than 1 mm,and therefore the same ranging capability are verified for the burst-pulses energy equal to the single pulse energy.The burst-pulses laser can better improve the energy than single pulse laser,and increase the pulse emission energy of the laser ranging;it is propitious to the detection for weak signal laser.

关 键 词：激光测距 皮秒激光 多脉冲 单光子探测 

分 类 号：TN249[电子电信—物理电子学]