Under the vigorous development of technology, GNSS is known to the public, and widely used in various fields, has become the main way we measure and positioning, however, in order to deal with these software GNSS observations used, have to spend money to purchase the or a lot of time to learn. With the development of GNSS positioning technology and data processing technology and the Internet, combined with the success of foreign Precise Point Positioning GNSS technology and online data processing services to the observation data users with a single dual-frequency GPS receiver units, in anywhere in the world without geographic limitations and data processing professional, the GNSS observation data collection after uploading processing system, you can get real-time or post-processing of high-precision positioning result. <br>In this study, through free online GNSS processing services provided by different units internationally, Hsinchu and Taoyuan be solving two international IGS tracking station observation data, and then analyze the accuracy of different services on the precise point calculations, in order to provide users with reference . Herein, respectively, for dynamic and static different calculation mode, for online processing system compare the accuracy of GNSS plane and elevation. According to the experiment results show: the performance of the plane accuracy, dynamic accuracy CSRS preferred mode, static mode places preferred APPS accuracy; the height accuracy of performance, accuracy dynamic CSRS preferred mode, static mode places more accuracy MagicGNSS good.
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