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Electronic compass measurement error analysis and compensation techniques

Author: DuYing
Tutor: LiJie
School: University of North
Course: Measuring Technology and Instruments
Keywords: Electronic compass Error Calibration and compensation Ellipse fitting Ellipsoid fitting
CLC: TP274
Type: Master's thesis
Year: 2011
Downloads: 187
Quote: 1
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Abstract


Inevitable error in the actual measurement of the electronic compass on the basis of the mechanism of the detailed analysis of the error , the proposed electronic compass error calibration and compensation method . Electronic compass according to the mechanism producing error error is divided into three-axis magnetic sensor manufacturing errors , installation errors and vector magnetic field error of three categories , including a three-axis magnetic sensor manufacturing error , including bias and sensitivity mismatch errors obliquity vector magnetic field error including hard magnetic interference error and soft magnetic interference error . Were established in the analysis of the impact of the error on the measurement results of the magnetic sensor based on a mathematical model of a manufacturing error , installation error mathematical model and the vector magnetic field error model . Error model using the least squares fitting method based on elliptic constraints , according to the nature of the ellipse , the ellipse constraints and solving the problem of the ellipse parameters translate into constraints extremum finalized fitting ellipse parameters and ellipse fitting method is extended to three-dimensional space , draw the ellipsoid - based constrained least squares fitting . Electronic compass error parameter calibration method based on error model and ellipse fitting ellipsoid , the error parameters deduced formula proposed manufacturing errors , installation errors / tilt , vector magnetic field error compensation method . The original three - dimensional magnetic field data for the electronic compass measuring sequentially compensated in accordance with the manufacturing error , installation error / tilt compensation , the order of the vector magnetic field compensation , reducing the deviation between the magnetic field data value with the ideal three - dimensional electronic compass error compensation . Last MATLAB - based electronic compass error calibration and compensation software design , and design appropriate test , calibrate the electronic compass error parameters turntable environment to verify the correctness and validity of the error compensation method and its application in the automotive environment in .

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