jgg     2015 35 (4):  676-679    ISSN: 0412-1961  CN: 21-1139/TG Equivalent Propagation of GNSS Baseline Vector Covariance  and Position Covariance 1 Key Laboratory of Land Environment and Disaster Monitoring of NASMG, China University of Mining and Technology, 1 Daxue Road, Xuzhou 221116, China 2 Department of Architecture Engineering, Suqian College,399 South-Huanghe Road, Suqian 223800, China 3 College of Geomatics Engineering, Nanjing University of Technology,30 South-Puzhu, Nanjing 211800, China Received: 2014-11-13  Revised: null  Online: 2015-07-29 Supporting info