基于Daubechies小波域KL变换的探地雷达信号处理  

Ground Penetrating Radar Signal Processing Based on KL Transform in Daubechies Wavelet Domain

作　　者：许德根 Xu Degen(Anhui Provincial Highway Engineering Testing Center,Hefei,Anhui 230041;Anhui Provincial Key Laboratory of Bridges and Tunnels,Hefei,Anhui 230041)

机构地区：[1]安徽省公路工程检测中心,安徽合肥230041 [2]桥梁与隧道安徽省重点实验室,安徽合肥230041

出　　处：《工程技术研究》2022年第11期13-15,共3页Engineering and Technological Research

摘　　要：探地雷达在探测的过程中容易受到噪声的干扰,使雷达记录中的目标信号难以分辨。KL变换利用相邻道之间的相关性来消除随机噪声,由于在时间域进行,有效信号和随机噪声在频率域的特点并没有考虑。在小波域内进行KL变换,可以通过分时分频进行去噪。文章对有限单元法获得的探地雷达模拟剖面分别进行KL变换、小波变换,以及在Daubechies小波域中进行KL变换。通过分析可知,在Daubechies小波域内进行KL变换可以有效压制模拟信号中棱角点的绕射波,提高信噪比,使目标体的反射信号得以归位,提高雷达图像的分辨率。Ground penetrating radar is vulnerable to noise interference in the process of detection, which makes the target signal in radar records difficult to distinguish. KL transform uses the correlation between adjacent channels to eliminate random noise. Since it is carried out in the time domain, the characteristics of effective signals and random noise in the frequency domain are not considered. KL transform is carried out in the wavelet domain, and denoising can be carried out by dividing time and frequency. In this paper, KL transform, wavelet transform and KL transform in Daubechies wavelet domain are respectively carried out on the simulated profiles of the ground penetrating radar obtained by finite element method. The analysis shows that the KL transform in the Daubechies wavelet domain can effectively suppress the diffraction wave at the corner point in the analog signal,improve the signal-to-noise ratio, make the reflected signal of the target body homing, and improve the resolution of the radar image.

关 键 词：探地雷达 KL变换 小波变换 分辨率 

分 类 号：TN957.51[电子电信—信号与信息处理]