Compensation for mobile carrier magnetic interference in a SQUID-based full-tensor magnetic gradiometer using the flower pollination algorithm

Abstract

The improving quality of ultra-sensitive superconducting quantum interference devices has led to the construction of advanced full-tensor magnetic gradiometers (FTMGs) integrated on mobile carriers such as aircraft, vehicles and ships. FTMGs measure the smallest spatial magnetic gradients, possessing many practical advantages compared to conventional scalar surveys and three-component surveys. However, the magnetic interference field caused by the magnetic sources associated with the carrier significantly decreases the precision of measurement. In this paper, a novel method is proposed to compensate for the magnetic interference field. Specifically, a mathematical model containing compensation coefficients of the mobile FTMG system is constructed by extending the Tolles–Lawson model. By formulating the task into nonlinear problems, unknown compensation coefficients in the model can be solved by the flower pollination algorithm, which has the advantages of insensitivity to iterative initial values, less parameter tuning and strong global search abilities. Both the finite-element simulation results based on COMSOL Multiphysics and the results of a field experiment show that the proposed method provides a useful way for the optimal estimation of compensation coefficients and the reduction of the magnetic interference field.

Magnetic target nonlinear positioning method based on planar regular octagon tensor system

“…anomaly scalar detection, vector detection, scalar gradient detection, and vector gradient full tensor detection [7,8]. Compared with other methods, the latest vector magnetic gradient tensor detection method has the characteristics of rich target information and can suppress geomagnetic interference [9,10]. Thus, the target detection technology based on the vector magnetic gradient tensor principle has gradually developed into a research hotspot and will be considered a breakthrough in this field [11,12].…”

Velocity-Related Magnetic Interference Compensation of Unmanned Underwater Vehicle

“…To reduce magnetic detection distortion, researchers have focused on studying carrier magnetic interference compensation [16][17][18][19]. In 1954, Tolles and Lawson analyzed the material composition and structure of aircraft to represent the interference as the sum of three field strengths: permanent field, induced field, and eddy current field, and proposed the Tolles-Lawson model [20].…”