中文摘要：

针对使用在线GPS定位服务系统处理南极地区GPS数据精度的问题,介绍4种常用在线GPS定位服务系统APPS、CSRS-PPP、gaps以及magicGNSS,分别使用4种在线GPS服务系统对南极地区长期连续（7d）观测数据进行处理,分析其精度与稳定性。将处理结果与相同框架下真值进行比较与分析,发现4种在线GPS服务系统在南极地区解算精度都能达到dm量级,其中APPS与CSRS-PPP两种服务系统在南极地区解算结果的精度与稳定性优于gaps与magicGNSS,可达cm量级。另外,使用4种在线GPS服务系统处理短期（1d以内）观测数据,对得到的解算结果进行分析可以发现3h以上观测时长的数据可以保证稳定的解算精度。

英文摘要：

In order to solve the accuracy of the GPS data in Antarctica using the online GPS precise Positioning Service System,four online Precise Point Positioning service systems（APPS,CSRS-PPP,gaps and magicGNSS）were introduced and used to process long-term continuous observation data（7days）in Antarctica.By comparing the results with the real coordinates under the same reference frame,we can see that the accuracy of four systems can reach dm level,the accuracy and stabilization of APPS and CSRS-PPP are better than that of gaps and magicGNSS.Then we use four systems to process short-term observation data（less than 24h）in Antarctica.By analyzing the results,we can see that observation period containing more than three hours can guarantee stable accuracy.