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Sensors 2018, 18(6), 1846; https://doi.org/10.3390/s18061846

A Novel Strategy for Improving the Aeromagnetic Compensation Performance of Helicopters

1
Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Received: 21 March 2018 / Revised: 19 May 2018 / Accepted: 22 May 2018 / Published: 6 June 2018
(This article belongs to the Section Physical Sensors)
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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. View Full-Text
Keywords: aeromagnetic compensation; optically pumped magnetometer; transfer function; coherent noise suppression; referenced magnetometer aeromagnetic compensation; optically pumped magnetometer; transfer function; coherent noise suppression; referenced magnetometer
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Chen, L.; Wu, P.; Zhu, W.; Feng, Y.; Fang, G. A Novel Strategy for Improving the Aeromagnetic Compensation Performance of Helicopters. Sensors 2018, 18, 1846.

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