为解决APD面阵激光雷达多路激光飞行时间测量这一关键技术,研制了多通道高精度并行时间间隔测量系统。系统硬件由研制的4个基本测量单元和1个数据打包单元组成,系统软件采用事件驱动模式编程,利用循环FIFO和中断技术实现与上位机数据通信。被研发的测时系统应用于5×5光纤阵列耦合APD面阵激光雷达试验后,面阵激光雷达所有25个通道最大的距离标准偏差为4.22 cm,测距偏差为-6.41 cm~10.58 cm,达到面阵激光雷达测距精度要求。%Time interval measuring system with multi-channel and high precision is designed and implemented, which is applied to solve a critical technology of multi-beam laser flight time measuring for APD array LiDAR. The hardware system consists of one data packing unit and four basic measurement units. Software programming adopts event driven mode,and utilizes circular FIFO and interrupt technology to accomplish data communication. The inter-val measuring system is used on 5×5 APD LiDAR with fiber coupling,the ranging precision meets requirements of array LiDAR,ranging deviation by converting from time is -6.41 cm~10.58 cm and the maximum ranging standard deviation is 4.22 cm in all 25 channels.
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