航空兵器2024，Vol.31Issue(1)：117-121,5.DOI:10.12132/ISSN.1673-5048.2023.0100
基于磁梯度测量的磁校准方法
Magnetic Calibration Method Based on Magnetic Gradient Measurement
摘要
Abstract
Before aircraft heading measurement by using a tri-axial magnetic sensor or magnetic anomaly detec-tion,magnetic interference calibration of the magnetic sensor is required.In order to avoid the degradation of calibra-tion accuracy due to the short-time fluctuation of the geomagnetic field,an interference calibration method for magnetic sensors using magnetic gradient measurement is proposed based on the geomagnetic field gradient distribution character-istics in near-earth space.A 24-parameter interference model for magnetic interference of the magnetic gradient meas-urement system is established,and a multivariate nonlinear equations is constructed based on multiple arbitrary rota-tions of the ellipsoidal fitting method for a single sensor,then by the solution of the nonlinear system equations using a genetic algorithm with higher region search efficiency.The simulation results show that,compared with the traditional ellipsoidal fitting calibration method,this proposed method overcomes the influence of short-time fluctuations of the geo-magnetic field,and improves the calibration accuracy of the magnetic gradient measurement system,whose differential magnetic gradient measurement error can be calibrated to[1.848 2 1.845 3 1.915 0]T nT.This study provides a relia-ble guarantee for the carrier interference compensation and high-precision measurement of the aero magnetic system.关键词
磁梯度测量/磁干扰校准/遗传算法/三轴磁强计/椭球拟合/航向测量/飞行器Key words
magnetic gradient measurement/magnetic interference calibration/genetic algorithm/tri-axial mag-netic sensor/ellipsoidal fitting/azimuth measurement/aircraft分类
军事科技引用本文复制引用
金煌煌,庄志洪,王虹..基于磁梯度测量的磁校准方法[J].航空兵器,2024,31(1):117-121,5.基金项目
国家自然科学基金项目(U2141237) （U2141237）
安徽省教育厅自然科学重点项目(2022AH051955) （2022AH051955）
黄山学院人才启动项目(2022xkjq002) （2022xkjq002）
