jgg     2007 27 (2):  47-51    ISSN: 0412-1961  CN: 21-1139/TG RESEARCH OF GPS ELEVATION FITTING MODELS BASED ON KRIGING METHOD Zhang Xiaohong 1) ;Cheng Shilai 2) ; and Xu Xiaodong 2) 1)School of Geodesy and Geomatics, Wuhan University, Wuhan 4300792)Research Center of GPS, Wuhan University, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null