jgg     2014 34 (3):  164-168    ISSN: 0412-1961  CN: 21-1139/TG ANALYSIS OF PRECISION OF POSITION VELOCITY AND CLOCK OF  GPS SATELLITES BROADCAST EPHEMERIS 1）Chinese Academy of Surveying and Mapping，Beijing 100830 2）Geomatic College，Shandong University of Science and Technology，Qingdao 266590 Received: 2013-09-20  Revised: null  Online: 2014-05-28 Supporting info