jgg     2014 34 (2):  146-149    ISSN: 0412-1961  CN: 21-1139/TG INFLUENCE OF ESTIMATION OF TROPOSPHERIC DELAY ON SHORT  BASELINE WITH BIG HEIGHT DIFFERENCE 1）School of Geodesy and Geomatics，Wuhan University，Wuhan 430079 2）Key Laboratory of Precise Engineering and Industry Surveying，NASMG，Wuhan 430079 3）Guangxi Key Laboratory of Spatial Information and Geomatics，Guilin 541004 Received: 2013-07-22  Revised: null  Online: 2014-04-21 Supporting info