卡尔曼滤波压制瞬变电磁干扰技术及应用

煤田瞬变电磁探测经常是在干扰较强的煤矿周边进行，采集到的二次感应场信号大多噪声水平较高，难以开展解释工作。为消除野外数据中的这些电磁干扰，根据衰减曲线单向衰减的形态特征，通过应用卡尔曼滤波技术压制各种干扰，较好地恢复数据原始信号。通过对受到高压线电磁干扰的煤矿采空区实际探测数据进行该滤波方法的处理解释，对比滤波后数据与高压线断电后原测区重测的不受干扰的数据，得到了基本一致的效果，证明了该方法的有效性。 

Technology of suppressing TEM interference by Kalman filtering and its application in detection of goaf in coal mine

Coal transient electromagnetic exploration is often conducted around a coal mine where man-made interference is stronger, noise in a secondary induction field signal is mostly higher, it is difficult to carry out processing and interpretation. In order to eliminate these electromagnetic interference in data, according to the morphological characteristics (One-way attenuation) of decay curve, by Kalman filtering method, suppressing interference can be quick and easy, and the original signal is better restored. By using this method to process and interpret the actual data affected by electromagnetic interference of high voltage line, comparison of data after filtering with data collected after power off of high voltage line, data have been basically consistent, demonstrating that the method is effective.