不同噪声下几种滤波方法的比较研究及改进

COMPARATIVE STUDY AND IMPROVEMENT ON SEVERAL DE-NOISING METHODS FOR DIFFERENT NOISE

比较研究了GPS变形监测数据处理中在不同噪声污染情况下小波滤波、中值滤波、均值滤波及其相关组合滤波的去噪效果,得出了各种方法的优缺点及其适用范围。同时结合三种滤波方法的优点,提出了一种改进的组合滤波方法,即先通过频率域的小波滤波,再使用空间域的中值滤波和均值滤波方法。经过理论分析和试验验证,其去噪效果优于传统方法。

The advantages, disadvantages and applications scopes of de-noising methods are compared using wavelet filter, median filter and mean filter in the cases of different single noise pollution and mixing noise pollution using the GPS deformation monitoring data. Combining with the advantages of three filtering methods, an improved composite filtering method is proposed, which the wavelet filter is used firstly, and then the median filter and mean filter methods are applied. Theoretical analysis and practical applications verify that de-noising effect of the im-proved method is better than tranditional methods.