Abstract
An aeromagnetic survey is an important method in magnetic anomaly detection and geophysical prospecting. The magnetic field is typically measured by optically pumped magnetometers (OPM) installed on the aircraft. The measurement accuracy of the OPM is easily affected by the platform-generated magnetic fields. Therefore, aeromagnetic compensation is necessary. The traditional compensation model only considers the permanent, induced, and eddy current interference magnetic field of the aircraft platform. However, the interference field produced by the avionics system, and the relative motion between the aircraft and the magnetometer, are still not taken into account. To address this issue, we proposed a novel strategy to eliminate the additional interference of the platform with two OPMs. Among them, the OPM located farther away from the aircraft serves as a sensing magnetometer, whereas the near OPM serves as a reference magnetometer. The coherent noise suppression method is used to process the residual magnetic field interference after compensation. By establishing the interference magnetic transfer function between the two sensors, the interference field can be suppressed. The results of the experiments demonstrate the effectiveness of the novel strategy, and the standard deviation of residual interference drops from 0.065 nT to 0.045 nT.
Highlights
Aeromagnetic exploration is an important method used in geophysical prospecting, especially in mineral exploitation, underground unexploded ordnance detection, and underwater target detection [1,2,3,4]
The experiment is designed to carry out aeromagnetic compensation using two optically pumped magnetometer (OPM) mounted on the helicopter
The optically pumped magnetometer II (OPM-II) is fixed at the middle of the bar, which is the reference magnetometer
Summary
Aeromagnetic exploration is an important method used in geophysical prospecting, especially in mineral exploitation, underground unexploded ordnance detection, and underwater target detection [1,2,3,4]. Aeromagnetic compensation research can be traced back to World War II, when it was used for detecting submarines under the water After the war, this technology was widely used in the civilian field, such as geological surveys and geophysical exploration. Around 2005, Nelson carried out a series of experiments with an experimental flight system, including the evaluation of noise levels during low-altitude flights, prediction of airborne noise levels with ground measurements, and assessment of the noise levels of an aircraft’s components [18,19] Among the methods, both the FOM and the signal’s standard deviation could be used as evaluation criteria for compensation performance. The results of the experiments demonstrate the validity of the novel strategy for improving the aeromagnetic compensation performance
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