基于合成孔径技术CSAMT成像研究

可控源音频大地电磁测深(CSAMT)在实际生产中具有广泛的应用,但依然存在着一些急需解决的问题,需引进新技术和方法,提高其探测、解释精度.根据CSAMT中同一目标体相邻的回波信号具有很强的相关性,借助合成孔径思想,对CSAMT数据进行相关叠加合成,进而提高其探测精度.本文首先解决了把应用于波动场的合成孔径技术应用到频率域扩散场中,再通过模型算例表明合成孔径技术可以有效的增强弱信号、提高分辨率、减小场源效应、提高信噪比等,通过噪声加载,也进一步证实了合成孔径成像技术在CSAMT的有效性.

Research on CSAMT imaging based on synthetic aperture technology

Controlled Source Audio MagnetotelluricSounding(CSAMT)has wide application in actual production,but there are still some problems that need to be solved.In order to improve the interpretation precision,some new techniques and methods must be introduced.According to the echo signal of the same target in CSAMT,there is a strong correlation.With the basic idea of synthetic aperture radar,the CSAMT date are synthesized by related superposition to improve its detection accuracy.In this paper,the synthetic aperture technique applied to the wave field is first applied to the frequency domain diffusion field.The subsequent model examples show that the synthetic aperture technique can effectively enhance the weak signal,improve the resolution,reduce the field source effect,and improve the signal-to-noise ratio.The effectiveness of synthetic aperture imaging technology in CSAMT is further confirmed by noise loading.