复信号分析技术及其在地质雷达数字处理中的应用

傅立叶谱分析是地质雷达数字处理最常用的手段,但其效果还不是很理想;复信号分析技术是一项新的数字处理技术,不仅具有高精度、高分辨率、能分辨深部弱信号等优点,而且能够利用多个参数联合进行评估。在介绍了复信号分析的基本原理之后,将复信号分析技术应用到地质雷达数字处理中,首先探讨了复信号参数的解释方法,然后分别对湖底和溶洞探测实际工程的数据进行傅立叶谱分析和复信号分析。比较两种处理技术的成果显示,经复信号分析技术处理的成果明显优于傅立叶谱分析成果,不仅图像更清晰、更准确地反映了地下异常,能够分辨出湖底不同时期沉积的淤泥的分界面,较大地提高了分辨率,而且多个参数谱相互印证,提高了地质雷达图像解释的可信程度。

APPLICATION OF COMPLEX SIGNAL ANALYSIS TO PROCESS GROUND PENETRATING RADAR DATA

It is usual to use Fourier spectrum analysis to process ground penetrating radar signal,but the effect is not always as good as excepted. Complex signal analysis is a new method to process signal. It owns high precision and high distinguishing ability. It can distinguish weak signal in deep place and determine the abnormal place by using several parameters together. Complex signal analysis and Fourier spectrum analysis are compared in the processing of signals of the cases of solution cavities and a lake. It is shown that the former is better than the latter in that the pictures obtained by the former reflect the abnormal more distinctly and accurately. The boundary surface of mud silting of different time under the lake and the solution cavities are distinct after the processing of complex signal analysis.