通过人工磁异常环对航空磁测系统的标定

Using a current-loop induced magnetic anomaly to calibrate an airborne magnetometry system

航空磁测系统具有广泛的用途,但是得到的数据通常包含多种来源的噪声,降低了系统对磁目标的探测能力。实验搭建了一个人工的大面积磁异常环电流线圈,并使用直升机机载光泵磁力仪对线圈在不同高度产生的磁场信号进行测量。通过对得到的信号进行去噪处理,能够标定航磁系统,进而用于航磁测量或者磁目标探测。实验和数据处理结果表明,这套系统能够在较远的距离探测到nT级的磁异常目标。

Airborne magnetometry has a long and fruitful history in many applications .The acquired data are usually contaminated by noises originated from a variety of sources ,which migrates the effectiveness of the system on detecting magnetic targets .In this paper ,a large loop with DC current is designed ,serving as a man‐made magnetic target . Then ,an experiment for helicopter‐borne magnetometry is performed to measure the induced magnetic field at different elevations .The acquired data after denoising can be used to calibrate the airborne magnetometry system which will be further applied to aeromagnetic measurement or magnetic targets detection .The data processed result shows a good performance for the system because it is capable of detecting a magnetic target of a few nT at a long distance .