全球定位系统2024，Vol.49Issue(2)：9-15,7.DOI:10.12265/j.gnss.2023096
联合加权小波和EEMD的GNSS坐标时间序列降噪分析
GNSS coordinate time series denoising analysis combined with weighted wavelet and EEMD
摘要
Abstract
Aiming at the problem that it is difficult to accurately separate the useful signal and noise in the GNSS coordinate time series,this paper proposes a noise reduction method based on combined weighted wavelet Z-transform(WWZ)and set empirical mode decomposition(EEMD).Through the noise reduction processing of the vertical coordinate time series of 70 continuous stations in the northwest region,the root mean square error(RMSE),signal-to-noise ratio(SNR),flicker noise(FN)amplitude and velocity uncertainty are used as the evaluation indicators respectively,which verifies that the noise reduction effect of the method in this paper is superior to wavelet noise reduction and EEMD noise reduction to a certain extent.The results show that compared with wavelet denoising and EEMD denoising,the RMSE of signal sequence after denoising is reduced by 0.331 mm and 0.757 mm respectively,and the SNR is increased by 1.911 dB and 3.635 dB respectively;The uncertainty of FN amplitude and velocity has been significantly improved,which verifies the effectiveness of the noise reduction method in this paper.关键词
GNSS坐标时间序列/降噪/小波/集合经验模态分解(EEMD)/速度不确定度Key words
GNSS coordinate time series/noise reduction/wavelet/ensemble empirical mode decom-position(EEMD)/velocity uncertainty分类
天文与地球科学引用本文复制引用
魏冠军,张沛,王立阳..联合加权小波和EEMD的GNSS坐标时间序列降噪分析[J].全球定位系统,2024,49(2):9-15,7.基金项目
国家自然科学基金(41964008) （41964008）
甘肃省自然资源厅科技创新项目(202217) （202217）
