jgg     2013 33 (增1):  152-155    ISSN: 0412-1961  CN: 21-1139/TG 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 Received: 2012-10-23  Revised: null  Online: 2013-09-25 Supporting info