多通道奇异谱分析提取的CORS站大地高形变信息

The MSSA method to extract the vertical deformation information in geodetic height time series from CORS station network

针对GNSS测站噪声与局部效应对坐标时间序列精度的影响,提出有效提取CORS站网大地高时序形变信息的多通道奇异谱分析方法。MSSA方法提取的研究区各测站共有垂直形变信号,总体趋势上表现较为一致的起伏波动,其振幅并非恒定,而是随着时间变化增大或减小。MSSA方法重构的时间序列精度普遍高于FFT多周期重构法,38座CORS站中92%的测站采用MSSA方法重构之后其精度均有不同程度地改善,精度提升了2.01%~16.89%。实验结果表明:MSSA方法相比FFT方法更合适区域CORS站网大地高时序共有形变信息的提取,研究结果有助于发掘水负荷迁移与形变之间的作用机理,可为陆地水储量变化精确监测提供重要技术参考。

Aiming at the precision influence of coordinate time series from GNSS station noise and local effect,the MSSA method is proposed to extract the common vertical deformation characteristics in geodetic height time series from CORS station network in this paper.The common vertical deformation signal from every station in study area extracted by MSSA method represents relatively consistent fluctuations on the overall trend.Its amplitude is not constant,but increases or decreases with time.Furthermore,the reconstruction accuracy from the MSSA method is generally higher than that from the FFT multi-period reconstruction method.92% of 38 CORS stations are reconstructed by the MSSA method,its time series accuracy is improved to varying degrees,its accuracy is increased from 2.01% to 16.89%.The results show that the MSSA method is more suitable for the effective extraction of common deformation signal in geodetic height time series from regional CORS station network than the FFT method.The research results in this paper are helpful to discover the mechanism of action between water load migration and deformation,and can provide important technical reference for accurately monitoring terrestrial water storage changes.