中文摘要：

提出利用GPS/GLONASS组合精密单点定位方法估计天顶对流层延迟,并与GPS精密单点定位估计的天顶对流层延迟进行对比。将IGS提供的新对流层产品作为参考值来评价对流层延迟的精度。利用位于中国区域的三个IGS站一周的数据进行了试算,结果表明截止高度角和对流层参数波谱密度值的设置会对精密单点定位估计结果产生较大影响,相比GPS单系统,GPS/GLONASS双系统组合的估计结果与IGS产品符合得更好。

英文摘要：

A combined GPS/GLONASS precise point positioning （PPP） approach is proposed to estimate zenith tropospheric delay （ZTD）, and the results are compared with those from GPS-only PPP. The new ZTD products of IGS are used as references to assess the estimated ZTD. The numerical computations are conducted using IGS da- ta collected at three Chinese stations within one GPS week. The results show that the different settings of elevation angle cutoff and spectral density value of tropospheric delay parameter have a large impact on the ZTD estimates. Compared with GPS-only PPP, the ZTD estimates obtained from the combined GPS/GLONASS PPP are more consistent with IGS products.