Chapter 2 introduce principle of GPS satellite locating technology, the architecture of GPS system, brief analysis of GPS signal, and the principle and architecture of GSM, the principle of SMS.

• 第二章介绍了GPS 卫星定位技术的定位原理,GPS 系统的组成,GPS 信号的简要分析。 GSM 系统的组成和工作原理,短消息系统的工作原理。