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<p>To address the issue of dynamic magnetic interference from flight platforms severely restricting the precision of SQUID in towed superconducting magnetic gradiometer systems, this paper proposes a novel magnetic compensation method. This method abandons the traditional compensation mode reliant on complex maneuvering flights, integrates key interference sources, and constructs a comprehensive interference model encompassing remanence, induced magnetism, eddy currents, and gradiometer imbalance. By introducing a time-domain differential operator to formulate the objective function, it leverages the significant differences manifested after first-order derivative operations between interference signals and weak magnetic anomaly signals—effectively enhancing signal discriminability and resolving weak target extraction challenges. A dynamic weight adjustment strategy based on magnetic field zoning is proposed to adaptively optimize objective function parameters in magnetic source and non-magnetic source areas, addressing the strong multicollinearity issue in magnetic gradient data. Furthermore, a PCA-Ridge Regression joint algorithm is designed to eliminate parameter redundancy through principal component dimensionality reduction while ensuring solution stability via ridge regression. Theoretical model validation demonstrates that the average root mean square (RMS) of residuals in 6 channels is as low as 10.28 pT/m, and the average signal-to-noise ratio (SNR) is increased to 27.37 dB. Flight experiment results show that the average improvement ratio (IR) of compensation for each tensor component of the survey line is increased by 2.06 times, the average standard deviation (SD) is reduced by 34.58%, and its performance is significantly better than that of the comparison methods. This method greatly reduces the dependence on complex flight maneuvers, simplifies the operation process, significantly improves the compensation accuracy of weak magnetic signals, and provides reliable support for the engineering application of superconducting aeromagnetic survey technology.</p>

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Research on high-precision compensation method for superconducting airborne full-tensor magnetic gradiometer system under dynamic interference

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Jian-ying Liu,
  • Hua Guo,
  • Jing-xin Qin

摘要

To address the issue of dynamic magnetic interference from flight platforms severely restricting the precision of SQUID in towed superconducting magnetic gradiometer systems, this paper proposes a novel magnetic compensation method. This method abandons the traditional compensation mode reliant on complex maneuvering flights, integrates key interference sources, and constructs a comprehensive interference model encompassing remanence, induced magnetism, eddy currents, and gradiometer imbalance. By introducing a time-domain differential operator to formulate the objective function, it leverages the significant differences manifested after first-order derivative operations between interference signals and weak magnetic anomaly signals—effectively enhancing signal discriminability and resolving weak target extraction challenges. A dynamic weight adjustment strategy based on magnetic field zoning is proposed to adaptively optimize objective function parameters in magnetic source and non-magnetic source areas, addressing the strong multicollinearity issue in magnetic gradient data. Furthermore, a PCA-Ridge Regression joint algorithm is designed to eliminate parameter redundancy through principal component dimensionality reduction while ensuring solution stability via ridge regression. Theoretical model validation demonstrates that the average root mean square (RMS) of residuals in 6 channels is as low as 10.28 pT/m, and the average signal-to-noise ratio (SNR) is increased to 27.37 dB. Flight experiment results show that the average improvement ratio (IR) of compensation for each tensor component of the survey line is increased by 2.06 times, the average standard deviation (SD) is reduced by 34.58%, and its performance is significantly better than that of the comparison methods. This method greatly reduces the dependence on complex flight maneuvers, simplifies the operation process, significantly improves the compensation accuracy of weak magnetic signals, and provides reliable support for the engineering application of superconducting aeromagnetic survey technology.