jgg     2014 34 (1):  104-107    ISSN: 0412-1961  CN: 21-1139/TG ANALYSIS ON TROPOSPHERIC DELAY IN ANTARCTIC GPS POSITIONING 1)College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054 2) China National Administration of GNSS and Applications, Beijing 100088 3) State Key Laboratory of Geographic Information Engineering, Xi’an 710054 4) GFZ German Research Centre for Geosciences, Potsdam 14473, Germany Received: 2013-05-02  Revised: null  Online: 2014-01-23 Supporting info