基于小波自适应阈值方法的探地雷达去噪  

Ground-penetrating Radar Denoising Based on Wavelet Adaptive Thresholding Method

作　　者：吴学礼[1] 王壮壮 习炳权 甄然[1] WU Xue-li;WANG Zhuang-zhuang;XI Bing-quan;ZHEN Ran(School of Electrical Engineering,Hebei University of Science&Technology,Shijiazhuang 050000,China)

机构地区：[1]河北科技大学电气学院,石家庄050000

出　　处：《科学技术与工程》2023年第11期4686-4692,共7页Science Technology and Engineering

基　　金：国家自然科学基金(62003129);河北省航空异性材料异型件成型技术国防重点实验室开放基金(GF202102)。

摘　　要：探地雷达在实际使用过程中会被各种噪声信号干扰,针对这一问题,提出一种基于小波自适应阈值算法的探地雷达信号处理方法。常规小波阈值算法处理探地雷达B-scan图像时因处理前后的小波系数有所差异,可能导致图像失真。为了使目标信号更加明确,并消除噪声等干扰,通过对小波阈值的选取方式和阈值函数进行改进,使用小波变换的不同层数的子带长度确定阈值,实现阈值自适应准确量化。实验结果表明该方法相对传统小波阈值算法更加适用于探地雷达信号处理,自适应阈值函数拥有更好的良好连续性和稳定性,进一步提高了去除直达波和降噪效果,更好地保存了目标图像的细节。与其他方法对比结果表明,本文提出的算法提高了峰值信噪比,降低了图像熵。可见该方法在探地雷达实际使用情况下有一定的应用价值。Ground-penetrating radar will be disturbed by various noise signals in the actual use process,and to solve this problem,a ground-penetrating radar denoising was proposed based on wavelet adaptive thresholding method.Conventional wavelet thresholding algorithms for ground-penetrating radar B-scan images may cause image distortion due to the difference in wavelet coefficients before and after processing.In order to make the target signal clearer and eliminate interference such as noise,wavelet thresholds were improved by the way of selecting wavelet thresholds and the threshold function,and the thresholds were identified with the length of sub-bands of different layers of wavelet transform to achieve adaptive and accurate quantization of thresholds.The experimental results show that the method is applicable to ground-penetrating radar signal processing and improves the good continuity and stability of the threshold function compared with the ordinary wavelet thresholding algorithm,further improves the direct wave removal and noise reduction effects,and better preserves the details of the target image.Comparing the results with other methods shows that the algorithm proposed in this paper improves the peak signal-to-noise ratio and reduces the image entropy.The research results show that the method has a certain application value in the practical use case of ground-penetrating radar.

关 键 词：雷达工程 探地雷达 背景降噪 小波变换 阈值函数 

分 类 号：TN957.51[电子电信—信号与信息处理]