海潮模型差异对GNSS坐标时间序列周期信号及噪声特性影响分析

选取FES2004、EOT11a、TPXO7.2和Chinasea2010等4种海潮模型分别对23个CMONOC沿海测站进行海潮负荷位移改正，分析不同海潮模型对中国沿海区域测站坐标时间序列的影响。定量比较高频潮波参数模型间差异对周期信号的影响，结果表明，周日、半日潮波参数差异对海潮负荷位移改正后序列长周期信号、周年信号和半周年信号功率的影响最大可达4.3%、2.6%、2.0%和9.1%、0.7%、9.6%。基于Chinasea2010和TPXO7.2海潮模型的OTL改正使WN+FN+RWN测站噪声组合所占比例增至43%，而基于FES2004模型的OTL改正对测站速度不确定度的改善最大，39%的测站得到60%~98%的改善。

Effects of Ocean Tide Model Discrepancies on Periodic Signal and Noise Characteristic of GNSS Coordinate Time Series

This paper investigates characteristic differences between GNSS coordinate time series induced by correction of different ocean tide models. Four ocean tide models (FES2004, EOT11a, TPXO7.2 and Chinasea2010) are selected to apply ocean tide loading correction on 23 CMONOC stations in coastal areas of China. Results show that the discrepancies of diurnal tide wave parameters can lead power variations of long-period/annual/semi-annual signal up to 4.3%, 2.6% and 2.0% respectively, which is 9.1%, 0.7% and 9.6% for semi-diurnal tide wave parameters. The outcomes indicate that ocean tide loading correction by Chinasea2010 and TPXO7.2 introduces a percentage increase (up to 43%) of a particular noise model combination among stations, which is white noise plus flicker noise plus random walk noise. However, as for the uncertainty of station velocity, the correction by FES2004 remains the most significant with a reduction of uncertainty reaching 60~98% for 39% of the selected stations.