小波阈值降噪在GPS伪距单点定位中的应用

Application of wavelet threshold de-noising in GPS pseudo-distance single point positioning

College of GeomaticsShandong University of Science and Technology, Qingdao 266590, China

摘要: 单点定位中多路径效应和接收机噪声等偶然误差对定位的精度影响较大,并且很难选取固定的模型对其减弱,针对上述问题,从全球定位系统（GPS）的信号结构、误差来源出发,剖析了小波分析的原理,采用离散正交小波db3对GPS伪距观测值C1进行了降噪处理．实验表明:使用上述方法对观测值进行处理后,在观测值质量较差的时段,定位精度可提高31.93％,在观测值质量较好的时段,定位精度可提高16.02％.
- GPS /
- 观测噪声 /
- db3 /
- 小波分析 /
- 伪距单点定位
Abstract: In single point positioning,the accidental errors such as multipath effect and receiver noise have a great influence on the accuracy of positioning, and it is difficult to select a fixed model to weaken it. In view of the above problems, analyzes the principle of wavelet analysis from the signal structure and error source of GPS, and uses the discrete orthogonal wavelet db3 to denoise the GPS observation C1.The experiment shows after the observed values are processed using the method described above, the accuracy of positioning can be improved by 31.93％ in the period when the quality of the observed value is bad, and the positioning accuracy can be increased by 16.02％ in the period when the quality of the observed value is good.
- GPS /
- observation noise /
- db3 /
- wavelet analysis /
- pseudo-range single point positioning

[1]	DONOHO D L. Denoising by softthresholding［J］.IEEE Transform on Information Theory,1995,41(3):613-627.DOI: 10.1109/18.382009.
[2]	COLLIN F, WARNANT R. Application of the wavelet transform for GPS cycle slip correction and comparison with Kalman Filter［J］. Manuscripta Geodaetica, 1995, 20(3):161-172.
[3]	岳建平,席广永.基于小波变换的GPS周跳探测［J］.测绘工程,2003,12(4):33-35.
[4]	杜向科.基于小波变换的GPS周跳探测及修复［D］.安徽理工大学,2006:46-50.
[5]	卓宁.小波分析技术在GPS数据预处理中的应用［J］.中国惯性技术报,2009,17(2):184-186.
[6]	谢尚威,张阳阳,王琦,等.小波分析的GPS数据去噪方法探讨［J］.导航定位学报,2017,5(2):125-130.
[7]	石杏喜,岳建平.基于小波的GPS基线解算精化处理技术及应用［J］.测绘通报,2004(5):18-21.
[8]	王涛.基于小波分析的GPS变形监测数据去噪方法研究［D］.昆明:昆明理工大学,2014:17-30.
[9]	周保兴.GPS数据预处理方法研究及应用［D］.南京:河海大学,2005:29-35.
[10]	赵斌.基于小波分析的RINEX级GPS数据预处理方法研究及其软件开发［D］.中国地质大学,2007.11-38.