jgg     2012 32 (6):  76-80    ISSN: 0412-1961  CN: 21-1139/TG ON GPS FORECASTING EPHEMERIS AND CLOCK CORRECTION ACCURACY AND EFFECTS ON STANDARD POINT POSITIONING Wang Aisheng ;and Wang Fei School of Geodesy and Geomatic, Jiangsu Normal University, Xuzhou 221116 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null