Research on the tasks arrive law of Satellite Information Application chain

This paper for the issue of Satellite Information Application chain input task describing and modeling, analyzes the basic process about tasks arising, And this paper will be divided into four satellite missions arrival process typically. Since the law has for mission to reach the general characteristics. So it is hard to described with general probability distribution. This paper proposes a method based on the EM algorithm fitting PH distributions, and uses PH distribution fitting the application of satellite information chain task input in different circumstances. At last, this paper gives experimental analysis to prove its feasibility.