一个介绍gprs基本原理的比较详细的文档，对整个gprs业务流程构架，接口、协议构架都有详细的描述。-A document detailing the gprs basic principle, describes the gprs business process architecture, interfaces, protocols, architecture has a detailed descr iption.

这是USB-GPS接收电路设计论文，详细介绍了实现的流程，目的是通过电平的转换，转串口芯片CH341A，实现了GPS与电脑的USB接口之间的通信。-This is a USB-GPS receiver circuit design papers, detailing the implementation process, the aim is to serial chip level conversion, CH341A, communication between the GPS and th

GPS接收机的整个仿真流程，GPS应用程序设计，内含GPS卫星原理、方法及详细源代码-receiver gps