高精度多脉冲激光测距回波检测技术

High precision multi-pulse laser ranging echo detection technology

针对远距离激光测距机回波信号脉宽强度特征和噪声的统计特性,提出了一种高精度多脉冲激光测距机的回波信号检测技术。采用时钟移相分配方式实现了400MHz高速信号采集及数字化处理,提高了回波脉冲的检测精度。采用ARM嵌入式高速核处理器进行数据算法处理,完成了滤波降噪、自适应门限检测和多帧相关检测等功能,使回波信噪比提高了7.6dB,达到远距离精确获取目标距离信息的目的。

Aiming at the pulse width intensity features of echo signal of long-distance laser range finder and the statistical characteristics of noise,a echo signal detection technology of high-precision multi-pulse laser range finder was proposed.The 400 MHz high-speed signal acquisition and digital processing was achieved by using the clock phase shift distribution way,so as to improve the echo pulse detection accuracy.An ARM embedded high-speed core processor was used for data processing,the functions of filtering noise reduction,adaptive threshold detection,multiframe correlation detection and others were completed,which can make the signal-to-noise ration(SNR)increased by 7.6 dB and make the goal for acquiring long-distance target information accurately achieved.