基于主成分分析的相对重力观测零漂和固体潮提取

利用主成分分析PCA提取2014-08-15~23CG-5相对重力仪静态相对观测的零点漂移和固体潮。结果显示,PCA提取的零点漂移值与最小二乘线性拟合结果非常一致,其差仅在10-2μGal/d量级;PCA估算的固体潮值与CG-5重力仪内部软件提供的固体潮模型计算值统计结果基本一致,两者之差均小于8μGal,均方根均小于5μGal。

Zero Drift and Solid Earth Tide Extracted from Relative Gravimetric Data with Principal Component Analysis

〗In this paper, a new algorithm of principal component analysis (PCA) is proposed to extract the zero drift and the solid Earth tide from static relative gravimetric data, as observed by CG-5 relative gravimeter from Aug 15 to Aug 23, 2014. The results of the linear drift extracted by PCA are very consistent with those calculated by the least squares linear fitting method, and the differences only reach to 10-2 μGal/d order of magnitude. The statistical results of the solid earth tide extracted by PCA are quite consistent with results derived from the solid earth tide correction provided by CG-5 gravimeter internal software. The statistical results of the differences of the two methods are both less than 8 μGal, and the RMS for 9 d are all less than 5 μGal.