jgg     2013 33 (5):  34-38    ISSN: 0412-1961  CN: 21-1139/TG ERROR ANALYSIS OF HIGH-RATE GPS DATA REAL-TIME  SINGLE-POINT VELOCITY-DETERMINATION 1State Key Laboratary of Geodesy and Earth’ Dynamics, Institute of Geodesy and Geophysics, CAS, Wuhan 430077 2)Graduate University of the Chinese Academy of Sciences, Beijing 100049 Received: 2013-02-04  Revised: null  Online: 2013-10-13 Supporting info