Characteristics Analysis of Magnetic Anomaly Signals in Airborne Magnetic Anomaly Detection

A high sensitivity optical pumping magnetometer is used to detect the magnetic anomaly signal in the space generated by a ferromagnetic target for the airborne magnetic anomaly detection system. Since the features of magnetic anomaly signals of the target at high altitude are less known, the detection distance of the traditional airborne magnetic anomaly detection system for the target is near, and the detection probability is low and the detection effectiveness is limited. In order to improve the detection performance of airborne magnetic anomaly detector, it is necessary to analyze the characteristics of the magnetic anomaly signal at high altitude. The time domain characteristics of the magnetic anomaly signal are analyzed by the measured noise and the target signal data, including the zero-crossing characteristic, the peak-to-peak amplitude distribution, the wavelength difference and the wave area. The results show that a significant difference of the characteristics between the target signal and the noise exists. The difference provides a mean to improve the detector performance.