小尺度区域GNSS网三种时空滤波方法研究Research on three spatial-temporal filtering methods for small scale regional GNSS network
侯争,郭增长,杜久升
摘要(Abstract):
针对时空滤波提取GNSS连续坐标时间序列中的共模误差对探测地壳微形变信息至关重要的问题,该文探索了小尺度区域内叠加滤波、主成分分析、独立分量分析等时空滤波方法的特性,基于华北地区13个GNSS测站连续3年的坐标时间序列进行时空滤波,并对比分析不同方法的滤波效果。结果显示,3种方法滤波后均不同程度地降低了坐标时间序列的离散度;区域叠加滤波与主成分分析提取的共模误差空间响应一致,滤波后的标准差基本相同,表明提取共模误差的性质相同,都以二阶统计量为主要信息;独立分量分析滤波后坐标时间序列的标准差较高,这与区域叠加滤波和主成分分析过度滤波有关。
关键词(KeyWords): 共模误差;区域叠加滤波;主成分分析;独立分量分析;时间响应;空间响应
基金项目(Foundation): 国家自然科学基金项目(41774041);; 河南省科技厅重点科技攻关计划项目(172102210277,172102310178)
作者(Author): 侯争,郭增长,杜久升
DOI: 10.16251/j.cnki.1009-2307.2018.07.021
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