Integrated Vector Calibration of Magnetic Gradient Tensor System Using Nonlinear Method

LI Qingzhu; LI Zhining; ZHANG Yingtang; FAN Hongbo; YIN Gang

doi:10.13203/j.whugis20170161

Volume 44 Issue 5

May 2019

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Geomatics and Information Science of Wuhan University > 2019 > 44(5): 714-722, 730. > DOI: 10.13203/j.whugis20170161

LI Qingzhu, LI Zhining, ZHANG Yingtang, FAN Hongbo, YIN Gang. Integrated Vector Calibration of Magnetic Gradient Tensor System Using Nonlinear Method[J]. Geomatics and Information Science of Wuhan University, 2019, 44(5): 714-722, 730. DOI: 10.13203/j.whugis20170161

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Integrated Vector Calibration of Magnetic Gradient Tensor System Using Nonlinear Method

1.
Department of Vehicle and Electrical Engineering, The Army Engineering University of PLA, Shijiazhuang 050003, China
2.
High Speed Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China

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Author Bio:
LI Qingzhu, master, specializes in magnetic anomaly detection. E-mail: laznlqz666@163.com
Corresponding author:
LI Zhining, PhD, associate professor. E-mail: lizn03@hotmail.com
Received Date: March 13, 2018
Published Date: May 04, 2019

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Abstract

Abstract

In order to obtain the accurate output of the tensor measurement, an integrated mathematical model of sensor biases, scale factors and non-orthogonality error of single magnetic sensor and the misalignment error between multi-sensor axes is established. Based on the cross magnetic gradient tensor system, a least-squares nonlinear integrated calibration method is proposed. Compared with the twostep scalar calibration, the integrated mathematical model can be used to estimate the entire 48 error parameters of the cross tensor system at once, and a low-cost vector calibration is realized using an man-made platform out-put as the reference, which greatly improves the calibration efficiency and accuracy of parameters estimated. Simulation and experiment results show that the accuracy of the error parameters' estimation of the tensor system is higher than 99.75%, the root mean square error of the total field intensity output is less than 2 nT and the root mean square error of the tensor component is less than 50 nT/m.
- magnetic gradient tensor system,
- nonlinear fitting,
- vector calibration,
- integrated calibration

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