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中文摘要：
近些年卫星导航系统的飞速发展，使得导航定位用户获取多模GNSS数据已成为一种趋势。而目前尚无一种能够同时检测GPS／BDS／GLONASS／Galileo数据质量的软件。针对新一代RINEX格式的GNSS数据，深入研究数据质量检测的方法。用C语言开发了与TEQC数据质量检测功能相近的软件QC，并对其正确性进行了验证。在此基础上，对iGMAS站的数据质量进行了分析，发现目前的多模GNSS接收机易发生钟跳；在多路径效应方面，BDS卫星的GEO卫星多路径效应的周期性较弱，信噪比也呈现出与GPS和GLONASS不同的特征。
英文摘要：
With the development of global navigation satellite system, it is a trend to receive satellite siginals from muti-systems for one receiver. At the moment there is no quality check software that can simultaneously process the data from GPS/BDS/GLONASS/Galileo. According to this, we developed a software that is similar to TEQC, by which the latest version of GNSS data can be processed. The reliability of this program was also verified by the data of iGMAS. At the meanwhile, the quality of iGMAS data was also analysed. The result shows that clock jump ap- pears for some receivers of iGMAS, the muhipath periods for BDS GEO is not obvious compared to MEO, what is more, the SNR of BDS is also different from GPS and GLONASS.
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Two-dimensional deformation monitoring over Qingxu(China) by integrating C-,L- and X- bands SAR imag
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