jgg     2012 32 (5):  72-77    ISSN: 0412-1961  CN: 21-1139/TG RESEARCH ON LONG BASELINE AMBIGUITY RESOLUTION OF NETWORK RTK Ke Fuyang 1) ; Wang Qing 2) ; and Pan Shuguo 2) 1)School of Remote Sensing, Nanjing University of Information Science & Technology, Nanjing 210044;2)School of Instrument of Science and Engineering, Southeast University, Nanjing 210096 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null