小波去噪在成像激光雷达仿真信号中的应用

发布时间：2018-09-09 16:07

【摘要】：通过设计成像激光雷达的各种参数,结合一种大气模式模拟得到了一维激光雷达信号,并根据高斯分布的特点和实测的光束宽度还原了二维光柱图像。对该原始图像加入不同强度的高斯白噪声和一定强度的平均背景,生成类似于成像激光雷达实测信号的染噪图像。使用二维小波变换的方法对染噪的激光雷达光柱图像进行去噪,获得了较好的去噪效果。去噪后的回波信号与原始回波信号之间的相对误差均在±12%以内。利用去噪的激光雷达信号反演出气溶胶的消光系数。将反演出的气溶胶消光系数与输入的大气模式下气溶胶的消光系数进行对比,结果表明二者的相对误差在±15%之内,并且总体变化趋势一致,由此验证了所提出的利用小波对激光雷达染噪图像进行去噪的可行性。
[Abstract]:The one-dimensional laser radar signal is obtained by designing various parameters of the imaging lidar combined with an atmospheric model simulation. The two-dimensional optical column image is reduced according to the characteristics of Gao Si distribution and the measured beam width. Gao Si white noise with different intensities and average background of certain intensity are added to the original image to generate a noisy image similar to the measured signal of imaging lidar. The method of 2-D wavelet transform is used to Denoise the laser radar optical column image which is dyed by noise, and a good denoising effect is obtained. The relative error between the denoised echo signal and the original echo signal is within 卤12%. The extinction coefficient of aerosol is obtained by using the de-noised laser radar signal. The results show that the relative error is within 卤15%, and the overall variation trend is the same. The feasibility of using wavelet to remove noise from laser radar image is verified.
【作者单位】：中国科学院安徽光学精密机械研究所大气成分与光学重点实验室;中国科学技术大学研究生院科学岛分院;
【基金】：国家自然科学基金(41405014)
【分类号】：TN958.98

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