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2017年10月20日“坚白”学术论坛第9期

时间:2017-10-19 来源:未知 点击:
报告题目:Evaluation of IGS real-time service (RTS) products on precise point positioning with raw observation models
    人:周    锋  博士  德国地学研究中心(GFZ)
    人:李星星  教授
报告时间:2017年10月20日上午9点
报告地点:学院227学术报告厅
报告人简历:
2005.09-2009.06  中国矿业大学  测绘工程专业 工学学士
2009.09-2012.06  中国矿业大学  大地测量学与测量工程专业 工学硕士
2012.07-2013.07  华东师范大学  通信与信息系统  科研助理
2013.09-至今         华东师范大学  通信与信息系统  博士在读
2015.09-2017.09  德国地学研究中心(GFZ)GFZ1.1部门联合培养博士
主要从事多系统GNSS实时精密单点定位的研究。
 
报告摘要:
The real-time service (RTS) launched by the International GNSS Service (IGS), which provides access to real-time precise products such as orbits, clocks, and code biases, has made remarkable contributions not only in real-time (RT) geoscientific applications such as atmospheric studies, earthquake and tsunami warning, but also in RT engineering services, i.e. positioning, navigation, and timing (PNT). However, the precision and accuracy of such RTS products is a key issue for RT applications. In this contribution, the availability and quality of seven types of RTS orbit and clock products in a one-month period (April 2017) have been evaluated with respect to the ESA/ESOC (European Space Agency’s Space Operations Centre) final products. In general, the availability of corrections was above 95% for GPS and above 90% for GLONASS. Among these IGS RTS products, orbit comparisons show that the 3D accuracy (root mean square, RMS) is about 3.2–7.9 cm for GPS satellites and 7.3–10.3 cm for GLONASS satellites. Afterwards, clock comparisons show that the precision (standard deviation, STD) is 0.09–0.20 ns for GPS satellites and 0.23–0.35 ns for GLONASS satellites. Furthermore, the impact of RTS products on RT precise point positioning (PPP), RT PPP tropospheric delays (PTDs), and RT PPP ionospheric delays (PIDs), which are based on raw observation models, is investigated comprehensively. Comparative analysis demonstrates that the performance of precise positioning and PTDs estimation using CNES RT products generally outperforms that of the other RT ACs. Furthermore, single-difference result of short baseline proves that PIDs are more precise than the traditional leveling ionospheric delays.


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