Tropospheric Zenith Delay Monitoring in GPS Precise Point Positioning
Precise point positioning (PPP) has been demonstrated to be a powerful sensor to monitor tropospheric zenith delay (TZD). In the PPP, some unmodelled biases still remain in the GPS observables and will inevitably degrade the precision of tropospheric zenith delay estimation. The researches show that the precision of PPP-derived TZD can be obviously improved through a suitable stochastic model for GPs measurements. Previous stochastic models assume that the accuracy of high-elevation GPS measurements is higher than that of low-elevation GPS measurements. a new stochastic model based on satellite elevation angel cosine is used in the presented paper. It examines the quality of the PPP-derived TZd calculated at shanghai GPS stations through comparison with those of nearby radiosonde soundings. It is found that the PPP-derived TZD have good agreement with results of radiosonde soundings. It is feasible to monitor tropospheric zenith delay by the singular GPS station in PPP.
Zhu Qing-lin Wu Zhen-sen Zhao Zhen-wei
School of Science, Xidian Univ., Xian 710071, China China Research Institute of Radio Wave Propagation, Qingdao 266107, China
国际会议
International Conference on Space Information Technology 2009(2009年第三届空间信息技术国际会议)
北京
英文
1-4
2009-11-26（万方平台首次上网日期，不代表论文的发表时间）