ZENITH TROPOSPHERIC DELAY AND ACCURACY ANALYSIS
WITH UPPP ALGORITHM
1)State Key Laboratory of Geodesy and Geodynamics, Institute of Geodesy and Geophysics, CAS, Wuhan 430077
2)Graduate University of the Chinese Academy of Sciences, Beijing 100049
3)GNSS Research Centre, Curtin University of Technology, Perth, Australia
Abstract In order to improve the accuracy and the reliability of the zenith tropospheric delay (ZTD) estimation, using uncombined precise point positioning (UPPP) model to estimate ZTD of the WUHN and BJFS stations, and then compared the results with ZTD of the traditional PPP model. The results show that the inner accuracy (RMS) of UPPP’s ZTD is 2.75 mm and the bias is 0.19 mm averagely; UPPP’s ZTD consistent with the ZTD of the IGS and UPPP’s exterior accuracy (RMS) is 8.58 mm (WUHN) and 6.51 mm (BJFS) separately; Seeing the ZTD of the IGS as the true value, the traditional model and UPPP model accuracies (STD) are 7.7 mm and 59 mm respectively; The UPPP method accuracy not only equals to or even greater than the traditional PPP’s, but it also provides the ionosphere products and weakens noise and improves data utilization.
