jgg     2014 34 (1):  161-164    ISSN: 0412-1961  CN: 21-1139/TG ANALYSIS OF MODEL IN ULTRA SHORT TERM PREDICTING  SATELLITE CLOCK ERROR 1) College of Navigation and Aerospace Engineering, Information Engineering University, Zhengzhou 450052 2) 96633 Troops of  PLA, Beijing 100096 Received: 2013-09-10  Revised: null  Online: 2014-01-23 Supporting info