激光雷达成像目标回波模拟时空匹配方法

Time-Space Matching Method for LiDAR Imaging Target Return Signal Simulation

为提高激光雷达成像目标回波模拟器与被试激光雷达探测设备的时空匹配性,提出了一种激光雷达成像目标回波模拟时空匹配方法。时间维采用粗控与精控延时分离、双通道系统差分补偿等措施,提高系统的延时精度,实现时间匹配;空间维通过光轴精密对准、光学系统匹配等方法实现空间对准。对本文方法进行了试验验证,结果表明系统时间维延时误差约755.5 ps,空间维图像复合误差优于1个像素。本文提出的方法可用于指导激光雷达回波目标模拟器的研制与集成。

To improve the time-space matching between light detection and ranging(LiDAR)imaging target return signal simulator and the tested LiDAR,a time-space matching method for LiDAR imaging target return signal simulation is proposed. In the time dimension,the method of delay separation of coarse control from fine control and that of the dual channel system differential compensation are adopted to improve system delay accuracy and to realize time matching. In the space dimension,the methods of optical axis precise alignment and optical system matching are adopted to realize spatial alignment. The methods were verified by experiments. The results show that the LiDAR delay error is about 755.5ps,and the image composite error is less than 1 pixel.The proposed method can be used to guide the development and integration of LiDAR imaging target return signal simulator.