jgg     2009 29 (2):  96-99    ISSN: 0412-1961  CN: 21-1139/TG COMPARISON AND INVESTIGATION OF VAV AND ETERNA TIDAL ANALYSIS METHODS Tian Guie 1) ; Chen Xiaodong 2) ; Sun Heping 2) ; Chen Guang 1) ;Song Lijie 1) ; and Liu Nannan 3) 1)Trafficing and Surveying College of Hebei Polytechnic University, Tangshan 0630092)Key Laboratory of Dynamical Geodesy, Institute of Geodesy & Geophysics, CAS, Wuhan 4300773)Industrial Development Reform Bureau of Caofeidian,Tangshan 063200 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null