Data Processing Research on Orientation Accuracy of Disturbing Base in Magnetic Levitation Gyroscope North Finder

Factors affecting the accuracy of magnetic levitation found north finder can be divided into high frequency and low frequency noise energy interference. In order to eliminate the effect of disturbing base on the precision of magnetic levitation gyroscope north finder,wavelet pretreatment method eliminating high frequency noise is firstly proposed; then,cubic spline interpolation envelope mean filter and robust estimation method based on EMD algorithm analysis detecting the size and location of noise points is used to eliminate the low frequency and abnormal interference. Also there is a comparing with the arithmetic average filtering and least squares method for the result precision of north seeker. The calculations shows that new improving methods can greatly enhance the accuracy of maglev north seeker when abnormal interference exists outside.