摘要
阐述了小波变换、多分辨分析及中值滤波的基本原理。研究了对小波变换的高频系数采用中值滤波,然后重构信号达到降噪目的的形变数据处理新方法。并与强制降噪及软门限阈值化小波降噪方法比较。模拟实验表明,基于高频中值滤波的小波降噪方法不仅能有效降噪,保持信号的光滑性,还能在降噪的过程中剔除少量粗差。
Wavelet transform, multi-resolution analysis theory and rnediam valuefilter technique are discussed in this peper. Compared with forced wavelet de-noising method and Soft-thresholding noise reduction, a new Wavelet De-noising method based on median value filter of high frequency of single epoch GPS deformation monitoring signals is proposed.Experimental results show that the proposed method can get perfect de-noising effects, keeping smooth properties of the signal as well as eliminating some gross errors.
出处
《测绘科学》
CAS
CSCD
2004年第1期24-25,32,共3页
Science of Surveying and Mapping
关键词
单历元
形变监测
中值滤波
小波变换
小波降噪
single epoch GPS signals
deformation monitoring
median value filter
wavelet transform
wavelet de-noising
