机载微脉冲激光测距是一种新体制的激光测距技术,通过采用单光子回波探测来实现远程测距.针对机载远程测距的应用需求,对激光回波信号、背景光特性进行了理论研究和数值计算,并完成了设计参数的仿真优化.将空间滤波和光谱滤波组合使用,有效地抑制了背景光噪声,实现了100 km的远程测距;通过双通道分光,大幅度提高了测距的动态范围,将测距盲区减小到500 m.实验表明,微脉冲激光测距系统能够有效探测500 m~100 km距离内的目标回波,探测概率PD不小于96%,虚警率PFA不大于0.3%.

Micro-pulse laser ranging is a new technique of laser ranging,which can achieve long-distance ranging by detecting the echo signal of a single photon.According to the requirement of long-distance laser ranging for airborne application,we made theoretical study and numerical calculation to laser echo signal and background light,and accomplished the simulation optimization of design parameters.The background light noise is suppressed effectively by using spectral filtering together with spatial filtering,and 100 km remote ranging is achieved.Through light splitting,the dynamic range of distance measurement is improved greatly,and the ranging blind zone is decreased to 500 m.The experimental result verified that micro-pulse laser ranging system can detect the echo signal between 500 m and 100 km effectuality,the detection probability PD is not lower than 96% and false alarm probability PFA is not bigger than 0.3%.