摘要
介绍了小波滤波去噪的原理并讨论在动态环境下GPS多路径效应的重复性问题。首先利用小波方法对静态观测数据的残差进行去噪,提取具有系统性的多路径误差改正模型。然后,根据多路径误差重复性的特点,对后续动态观测的数据进行改正。通过实验证明:经重复性模型改正后残余的多路径噪声符合正态分布的特点。然后采用小波软阈值去噪方法,消除剩余的多路径误差,可进一步提高动态变形监测的精度。
The principal of wavelet denoising is introduced and the replicability of GPS multipath effect in dynamic environment is discussed firstly. Then, a systemic multipath error correction model is presented by applying wavelet denoising to static observation. Finally, the dynamic observation is corrected. Experiments prove that remain denoises after multipath model correction are accord with normal distribution, and the precision of dynamic deformation monitoring can be improved.
出处
《测绘科学》
CSCD
北大核心
2008年第6期55-56,8,共3页
Science of Surveying and Mapping
关键词
小波变换
GPS
变形监测
多路径效应
wavelet transform
GPS
deformation monitoring
multipath effect
