jgg     2013 33 (1):  69-73    ISSN: 0412-1961  CN: 21-1139/TG REGIONAL IONOSPHERIC MODELING AND ITS APPLICATION IN  SINGLE POINT POSITIONING ANALYSIS Zhang Rui1) ;Yao Yibin1) ; and Zheng Yanli2) 1) School of Geodesy and Geomatics, Wuhan University, Wuhan 430079;2) Research Center of GNSS, Wuhan University, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null