基座扰动影响磁悬浮寻北仪精度的数据处理方法研究

摘要

影响磁悬浮寻北仪精度的因素可分为高频噪声干扰和低频大能量干扰，为消除基座扰动对磁悬浮寻北仪精度的影响，采用小波预处理消除系统内部高频噪声影响；并提出基于EMD分解干扰点检测的三次样条插值包络均值滤波结合抗差估计的新算法，以有效消除外界低频大能量干扰。对比分析算数均值滤波和最小二乘法的寻北结果精度，计算结果表明，存在外界异常干扰时，提出的处理算法可以得到更高的寻北精度。%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.