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 space missions, including design, test, launch, operation, and mission applications.)