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针对脉冲激光测距因云烟干扰造成的多径效应而难以准确定位目标回波的问题,介绍了倒谱提取时延的原理,以及利用倒谱技术结合信号积累来定位真实目标回波位置的方法,随后分析讨论了累积次数、混叠因子和输入信噪比对目标定位率的影响,并用蒙特卡罗法统计得到3个影响因子与目标定位率的关系图。针对输入信噪比对目标定位率有较大影响的分析结果,使用小波阈值去噪作为算法的预处理,仿真结果表明加入去噪流程后定位性能得到了一定提升。
Aiming at the problem that pulse laser ranging is difficult to accurately locate the target echo due to the multipath effect caused by cloud smoke interference, the principle of cepstrum extraction delay and the method of using cepstrum and signal accumulation to locate the true target echo are introduced Then, the influence of cumulative number, aliasing factor and input signal-to-noise ratio on the target localization rate is analyzed and discussed. The relationship between the three influence factors and the target localization rate is obtained by Monte Carlo method. Aiming at the analysis result that the input signal-to-noise ratio has a great influence on the target localization rate, wavelet threshold denoising is used as the preprocessing algorithm. The simulation results show that the localization performance has been improved after adding the denoising process.