摘要
在地质雷达直达波抑制过程中经常会出现削弱目标信号的问题,对此提出基于自适应分数阶傅里叶变换的地质雷达直达波抑制方法,将水平线状直达波与双曲线状目标回波映射到分数域空间,实现信号在分数域的时频展开,逐步分离直达波与目标信息。为了获取最佳分数阶的直达波抑制效果,通过重构图像中的目标区域与直达波区域能量比最大化,在抑制直达波的同时也增强了目标回波。实验结果表明提出的方法能有效抑制地质雷达直达波,并对干扰噪声具有鲁棒性。
In the process of geological radar direct wave suppression, target signal weakening often appears.This paper put forward a geological radar direct wave suppression method based on self-adaptive fractional order Fourier transform, which reflected horizontal direct wave and hyperbolic target echo to score domain space,realized time-frequency expansion of signal in score domain, and gradually separated direct wave and target information. In order to achieve direct wave suppression effect with optimal fractional order, it suppressed the direct wave and enhanced target echo as well by maximizing energy ratio of target area in image and direct wave area. The experimental results showed that the method proposed in this paper could effectively suppress geological radar direct wave and had robustness on interfering noise.
作者
周丽军
ZHOU Li-jun(Shanxi Transportation Technology Research & Development Co.,Ltd., Taiyuan, Shanxi 030032, China)
出处
《山西交通科技》
2019年第3期95-98,共4页
Shanxi Science & Technology of Transportation
基金
国家自然科学基金(51705299)
山西省青年科技研究基金(201801D221047)
山西省交通运输厅项目(2017-1-25)
关键词
分数阶傅里叶变换
地质雷达
直达波
fractional order Fourier transform
geological radar
direct wave
