Abstract
With the problem of attitude measurement accuracy is susceptible to various errors of geomagnetic survey, this paper establishes geomagnetic measurement error ellipsoid model by analysis of on the environment and own errors, uses the maximum likelihood algorithm for solving the static error correction coefficient. The experimental results show that, the maximum of attitude angle errors is less than 5° near blind direction, online combination correction can ensure the accuracy of attitude detection system under different shooting conditions.
Highlights
Earth's magnetic field is continuous distribution and very stable
The effect of the on-line correction method is significantly better than the static correction method when the directions of firing are northeast, southeast, southwest, and northwest. This is because the error correction matrix S-1 and the error vector b of the static correction method are obtained by fitting the geomagnetic field components of the north, east, south and west directions
The error correction of geomagnetic measurement is the key to improve the performance of geomagnetic measurement system
Summary
Earth's magnetic field is continuous distribution and very stable. The geomagnetic field can block the radiation of high-energy particles from the aerospace, and provide a mild environment for the atmosphere and the hydrosphere of the earth's biological life. Geomagnetic navigation technology can use the natural coordinate system formed by the Earth’s magnetic field to complete the attitude control and positioning for ships and aircraft[10,11] It is simple and reliable, and the navigation errors do not cumulate with the time. Renaudin established an integrated error model by analyzing magnetic resistance sensor errors and environmental interference errors In this model, he put forward adaptive least squares fitting method to calculate the ellipsoid equation coefficient of the comprehensive error model, and realize the error correction of the magnetic resistance sensor based on singular value decomposition of matrix calculation comprehensive error coefficient model [15]. This method can automatically adjust the correction factor according to the output of magnetic resistance sensor, but the change matrix is not symmetric matrix under the comprehensive influence of the magnetic sensor itself and environmental interference errors, so the method is not accurate, and needs a lot of iterative calculation
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