说明：  Satellite Tool Kit(STK)由美国AGI开发的一款在航天工业领域中处于绝对领先地位的商品化分析软件。主要应用于卫星仿真，这里附上的是这个软件的PPT培训教程
(Satellite Tool Kit(STK) is a commercialization analysis software development by the U.S. AGI Company which if in the absolute leadership in the field of aerospace industry. it s mainly applied to the satellite simulation.Here attached the software training course. )