基于高阶累积量的脉冲激光雷达信号处理技术研究

Research on Signal Processing Technology of Pulsed LiDAR Based on High-Order Cumulant

当前,激光雷达在低信噪比条件下的微弱目标探测能力面临挑战。基于多脉冲累积、高阶累积量的信号处理技术备受关注。针对激光雷达全通道高阶累积量信号处理中的易溢出、高虚警率问题,提出了分段多层检测思路,并对高阶累积量信号处理技术开展了理论分析、算法仿真以及软、硬件实验研究。实验结果表明:在同等测试条件和不增加额外硬件资源的前提下,采用该信号处理方法,整机消光比提高约1.5 dB,探测距离提高约10%。该信号处理流程合理可行,算法简单有效,具有一定的工程应用价值。

At present,the weak target detection ability of LiDAR under the condition of low signal-to-noise ratio faces challenge.Signal processing technology based on multi-pulse accumulation and high-order cumulant has received many attentions.In order to solve the problems of easy overflow and high false alarm rate in the high-order cumulant signal processing of LiDAR in all channels,the detection idea of segmented multi-layer was proposed,and theoretical analysis,algorithm simulation,software and hardware experimental researches on the high-order cumulant signal processing technology were carried out.The test results show that under the same test conditions and without adding additional hardware resources,the extinction ratio of the equipment is increased by about 1.5 dB,the detection distance is increased by about 10%by using the signal processing method.The signal processing process is reasonable and feasible,the algorithm is simple and effective,and has certain engineering application value.