说明：  提供的源码有两个：分别是用于仿真模拟铱星卫星通信系统和Teledesic卫星通信系统。使用的编程语言是TCL，模拟环境是NS2。通过更改地球终端的地理位置，可以仿真和模拟卫星通信系统，并对卫星系统的性能进行分析和测试。
(Provided by the source code there are two: namely, for the simulation of Iridium satellite communications system and the Teledesic satellite-communications systems. Using the programming language is TCL, simulated environment is NS2. By changing the Earth terminal location, you can simulate and analog satellite communication systems, and satellite systems performance analysis and testing.)