Research on Underwater Acquisition and Processing of Magnetic Anomaly Signal

To address the false alarm issue caused by the calm variations of the geomagnetic field in underwater magnetic target detection, a magnetic anomaly signal processing method based on the moving variance algorithm is proposed, and experiments are conducted for verification. First, an underwater magnetic anomaly detection model is established, and based on this model, an underwater acquisition experiment for magnetic anomaly signals is designed. Then, an appropriate window width is selected to extract the magnetic anomaly characteristics of the experimental signals using the moving variance algorithm. Finally, the extracted results are compared with the actual conditions observed during the experiment. The experimental results show that the extracted magnetic anomaly is in good agreement with the actual situation. The proposed method is not affected by the normal fluctuations of the geomagnetic field and can conveniently and effectively extract magnetic anomaly information to determine whether a target has passed through.