电光与控制, 2014, 21 (9): 11, 网络出版: 2014-09-15
低信噪比下多高斯脉冲组成的激光雷达回波信号滤波算法
A Filter Algorithm for Laser Radar Echo Signal of MultiGaussian Pulse at Low SNR
摘要
针对激光目标回波信号在高信噪比与低信噪比时脉冲波形不同的特点,研究设计了针对低信噪比下多高斯脉冲组成的回波信号进行降噪的小波滤波算法。首先介绍了光电探测中信噪比的定义,给出了不同信噪比下脉冲回波的实际波形。接着,研究了高信噪比时激光回波的时域积累及差分平滑滤波算法,仿真并分析了算法性能。随后,对低信噪比下多高斯脉冲组成的目标脉冲波形采用小波低频系数重构滤波,通过仿真实验选择了合适的小波基以及分解层级。
Abstract
Considering the characteristics of pulse waveform of laser echo signal in high SNR which is different from that in low SNR a wavelet filtering algorithm for low SNR Gauss pulse echo signal was studied. The definition of photoelectric detection SNR is introduced and the different SNR pulseecho waveforms are presented in the paper. Then the echo signal accumulation in time domain and smooth filtering algorithm under high SNR conditions are studied. The simulation and analysis of the performance of the algorithm are given. Subsequently for the multiGaussian pulse in the low SNR of the target pulse waveform the lowfrequency wavelet coefficient reconstruction filter is adopted and an appropriate wavelet function and decomposition level are selected by simulation experiments.
樊宪唐, 张斌, 马鹏阁, 羊毅. 低信噪比下多高斯脉冲组成的激光雷达回波信号滤波算法[J]. 电光与控制, 2014, 21(9): 11. FAN Xiantang, ZHANG Bin, MA Pengge, YANG Yi. A Filter Algorithm for Laser Radar Echo Signal of MultiGaussian Pulse at Low SNR[J]. Electronics Optics & Control, 2014, 21(9): 11.