摘要
利用小波变换对GPS观测数据进行阈值法消噪,比较了软阈值处理和硬阈值处理及几种阈值确定准则的处理结果。结果表明观测数据经过小波消噪后,整周模糊度解算的可靠性有所增强,基线解算的精度也得到了提高,但不同的阈值处理结果有较大差异,总体上软阈值处理的结果优于硬阈值处理的结果,4种阈值确定准则中固定阈值原则的效果最佳。
Wavelet transform is usually used to reduce the high frequency noise of carrier phase GPS double differences observation. The computation outputs with soft thresholding and hard thresholding as well as several threshold selection rules are compared. The experiments indicate that ambiguity solutions become more reliable and the coordinates more precise after wavelet threshold de-noising, while different threshold selection rules generate different results. In general, the soft thresholding with the universal threshold provides the best results.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第4期79-82,87,共5页
Journal of Geodesy and Geodynamics
基金
国家863计划项目(2007AA12E345)
关键词
GPS
小波变换
整周模糊度
基线解算
小波阈值消噪
GPS
wavelet transform
ambiguity
baseline resolution
wavelet threshold de-noising
