jgg     2013 33 (1):  59-63    ISSN: 0412-1961  CN: 21-1139/TG RESEARCH ON SHORT-TERM PREDICTION OF SATELLITE CLOCK ERRORS BASED ON IMPROVED GREY ARMA MODEL Li Xiaoyu1） ; Yang Yang2） ; Hu Xiaofen1） ; and Jia Ruixi1） 1）Academy of Equipment of PLA, Beijing 101416;2)61081 troops of PLA,Beijing 100094 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null