STK是由美国Analytical Graphics公司开发的一款在航天领域处于领先地位的商业分析软件。STK支持航天任务的全过程，包括设计、测试、发射、运行和任务应用。(STK is a commercial analysis software developed by Analytical Graphics, Inc., which is the leading player in aerospace industry. STK supports the whole process of s