利用PPP反演海潮负荷位移参数

选取高纬地区的3个CORS站以及中纬地区的SHAO测站，利用PPP浮点解计算测站未经海潮负荷位移改正的坐标时间序列，采用傅里叶变换方法提取分潮的周期信息，进而反演其中8个主要分潮的海潮负荷位移参数，将其与5个全球海潮模型DTU10、EOT11a、GOT4.8、TPXO.7.2、FES2004计算得到的海洋负荷位移参数比较。结果表明,PPP反演得到的8个主要分潮的海潮负荷位移参数与海潮模型计算结果具有较好的一致性，两者均方根差异为mm级，说明利用PPP反演海潮负荷位移参数是可行的。

Estimates of Ocean Tide Loading with PPP Displacements

In recent years, all kinds of global and regional continuous GPS tracking station networks have been established around the world. We apply these networks to enhance the resolution and precision of existing global ocean tide models in coastal areas. In this paper, we obtain one-year PPP-based position time series of four stations (AC67, AC43, AC39, SHAO), and then extract and inverse the corresponding ocean tidal periodic information, specifically eight major tidal constituents of OTL, by using fast Fourier transformation (FFT). It is indicated that PPP-derived OTL agree well with those calculated by the DTU10, EOT11a, GOT4.8, TPXO.7.2 and FES2004 models, and the RMS (root mean squares) of the differences between them is at the millimeter level. It is demonstrated that the estimates of OTL displacement by the PPP technique are available