一种用于浅层地下异常目标的深度计算方法

Research on depth calculation method for shallow underground anomalous targets

时间域电磁(TDEM)法对于浅层地下异常目标的探测具有十分重要的意义,但是基于该方法的测量区域结果只能反映地下异常目标的水平位置,并不能给出其深度信息。对于未爆弹(UXOs)和考古文物等地下埋藏物体而言,目标深度的提取对其分类识别及后期挖掘处理至关重要。针对目标深度传统计算方法中存在的结果精度不足以及使用局限性等特点,提出了基于垂直梯度接收线圈配置方式的浅层地下异常目标深度计算方法,通过将地下异常目标等效成磁偶极子,利用最优化方法计算得到目标深度。仿真和野外试验结果证明了提出方法对目标深度计算的有效性及鲁棒性,并且该方法计算时间非常短,满足实时处理的要求。

The TDEM(time domain electromagnetic) method is very important for the detection of shallow underground anomalous targets, but the measurement area results based on this method can only reflect the horizontal position of the underground anomalous targets, and cannot give their depth information. For underground targets such as UXOs(unexploded ordnances) and archaeological relics, the extraction of target depth is crucial to their identification and excavation processing. Aiming at the shortage of precision and limitation in the traditional method of calculating target depth, a method for calculating the depth of shallow underground anomalous targets based on the configuration of the vertical gradient receiving coil is proposed. In this method, the underground anomaly target is equivalent to a magnetic dipole, and the target depth is calculated using the optimization method. Simulation and field test results prove the effectiveness and robustness of the proposed method for target depth calculation, and the calculation time is very short to meet the requirements of real-time processing.