GPS时间序列中异常周期信号影响机制分析

The Effects Mechanism of Anomalous Period Signal in GPS Time Series

采用功率谱分析和主成分分析的方法对GPS坐标时间序列的周期性变化进行了探讨,对IGS站的部分时段的观测资料进行了处理,分析了台站时间序列潜在的周期性质。证实了异常周期项(1.04 cpy)的存在,对探测出的异常周期信号分别从构造信号、共模误差、地表质量负荷等影响因子展开讨论,分析其来源及影响机制。结果表明,上述影响因素未能对异常周期信号做出合理解释,该异常信号与GPS观测技术本身,即未模型化的GPS系统误差相关。对其影响因素做了初步探讨,为进一步建立相应的误差改正模型,增强GPS观测技术的稳健性提供了一些参考。

Power spectral analysis and principal component analysis were used to explore periodical singal variation on GPS time series. Six years ＇ observations of IGS stations were analyzed to explore the potential period variation of the time series. The presence of abnormal periodic terms in GPS time series were. With the detected abnormal periodic signals, dis- cussion was separately on tectonic signal, common-mode er- ror, surface mass load and other factors, with its origin and influence mechanisms analyzed. The results show that the above-mentioned factors can not make a reasonable explanation.The abnormal signal is relevant to GPS technology itself, which is the unmodeled GPS system error. A preliminary study has been made on its influence factors, which will contribute some reference to the further establish the error correction model, enhance the robustness of GPS solution techniques pro- vide some reference.