对流层延迟对高差较大GPS测站短基线时间序列的影响分析

选择5对IGS测站短基线作为研究对象，使用两种不同的基线解算方案进行数据处理，基于小波分析方法研究对流层延迟估计对高差较大GPS测站短基线时间序列的影响。结果表明，对于高差大于100 m的短基线，不估计对流层延迟会使高程方向时间序列出现虚假的季节性变化，周年振幅影响最大可达17.7 mm，估计对流层延迟后该季节信号显著减弱；此外，还发现不估计对流层延迟时，测站间天顶总延迟差异与基线高程方向产生的偏差具有一定的相关性。

Analysis on Influence of Tropospheric Delay on Short Baseline Time Series from GPS Stations with the Large Height Difference

Tropospheric delay is one of the important factors that affect GPS short baseline resolution. When the height difference between stations is large, the spatial correlation of tropospheric delay is weak, and consequently cannot be eliminated by double difference treatment completely. This not only affects the precision of single session solution, but also leads to the error in the long-term span of time series observation and it affects the long-term linear speed estimation of measuring stations. To analyze the influence of estimation of tropospheric delay on time series of GPS short baseline with big height differences based on the wavelet analysis method, 5 pairs of short baselines from IGS stations are selected as the research objects and two different baseline solutions for data processing are used.The result shows that for the short baseline,if the height difference is more than 100 m, it will bring about spurious signals in height direction time series without the estimation of tropospheric delay,and the annual amplitude is up to 17.7 mm.The spurious signals aresignificantly reduced with tropospheric delay; in addition, it is found that there is some correlation between the zenith delay difference and the error in the elevation direction.