基于软件无线电的甚低频法探矿的研究

VLF method prospecting based on software radio

甚低频电磁法在对矿体的定位预测中,扮演了不可替代的作用,但是当今社会的勘察与开采研发逐步加深及其露头矿与浅层矿的量藏逐步减少,致使探矿的难度相应加大.这就要求我们必须对地下隐伏矿体做出更加准确的定位探测,至此,提出一种甚低频法与软件无线电技术进行组合应用的物探新方法亟不可待,利用俄罗斯甚低频Alpha导航系统发射的大功率高精度的甚低频(VLF)信号作为场源,这些信号导入地下后是一些强大的电磁波信号,遇到良导体发出电磁感应致使振幅和相位的异化,经过射频天线、抗混叠滤波器、A/D转换器等,最后由信号处理分析仪分析计算出感应电磁场振幅和相位的变化量,电磁场的垂直分量、水平分量和极化倾角并判断出零交点的准确位置,为隐伏矿体的准确定位提供依据.最后做出相应的仿真,验证了该方法的可行性.

The VLF electromagnetic method in predicting the location of ore body,plays an irreplaceable role,but the exploration and mining development in today＇s society gradually deepened and outcrop mine and shallow ore deposits gradually reduced,resulting in the difficulty of the corresponding increase of prospecting. This requires us to make more accurate positioning of underground concealed orebody exploration, so far, the new method of geophysical combination application presents a VLF method and software radio technology is desiderated by Russia, the VLF emission Alpha navigation system of high power high precision of VLF signal as source of field these signals into the ground,after some strong electromagnetic wave signal,alienation encounter good conductor issued electromagnetic induction resulting in amplitude and phase,after RF antenna,anti aliasing filter,A / D converter,finally the signal processing analyzer analysis to calculate theelectrom agnetic field change weight induction electromagnetic field amplitude and phase of the vertical component,performance the horizontal component and polarization angle and determine the exact position of zero crossings, provide the basis for accurate positioning of the concealed orebody. Finally, make the corresponding simulation,verified the feasibility of this method.