Dual-Channel Aeromagnetic Compensation Method for Continuous and Intermittent OBE Interference

Aeromagnetic measurement is a crucial geophysical exploration method, but magnetometer measurements are often disturbed by aircraft maneuvers (AMs) and interference from onboard electronic (OBE) devices. OBE devices can be categorized into continuously operating devices and intermittently operating devices, which pose significant challenges to existing aeromagnetic compensation methods. To address this issue, this article proposes a dual-channel aeromagnetic compensation (DCAC) method. The proposed method classifies platform interference into continuous and intermittent types, constructs a Gaussian mixture model (GMM)-based switching vector to track intermittent interference states, and enables joint calibration via dual-channel optimization. First, we introduce a dual-channel interference model that separates platform interference into continuous and intermittent components based on their temporal characteristics, using a switching vector to identify the active mode of intermittent interference. Second, we propose a dual-channel coefficient calibration algorithm that employs a blockwise update strategy for calculating interference coefficients for each channel. To further enhance robustness, a frequency-response-aware compensation (FRAC) approach is introduced to mitigate transient estimation spikes caused by the time lag between abrupt current changes and delayed magnetic responses. Experiments on public datasets validate that the proposed method effectively compensates for complex magnetic interference from the flight platform. Compared to existing methods, the proposed method achieves at least a 9.47% improvement in the improvement ratio (IR).