Combined Noise Reduction Algorithm for High Precision Geomagnetic Measurement in Geomagnetic Matching Location
In geomagnetic matching and positioning,geomagnetic measurement signals contain a variety of magnetic disturbance noise such as magnetic field of soft and hard magnetic materials of navigation carrier,magnetic field of electrical equipment,magnetic field of power transmission equipment,etc.The characteristics of magnetic field generated by soft and hard magnetic materials,electrical equipment and power transmission equipment are theoretically analyzed,and the magnetic field compensation model of soft and hard magnetic materials with fixed parameters is deduced.The principle and feasibility of wavelet denoising are analyzed,and the magnetic disturbance error is eliminated by using the fixed parameter and wavelet filter combined denoising algorithm.The experiment and error analysis show that the algorithm has a good noise reduction effect,and effectively solves the key problem of magnetic disturbance noise in geomagnetic measure-ment.The mean square error is less than 10 nT,and the purpose of improving the geomagnetic measurement accuracy is achieved.
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