GPS信号的规则，在GPS官网上下载的资料。
Rule GPS signals. GPS signals official website to download information (2014-12-02, PDF, 996KB, 下载4次)
这是gps芯片US-TECH公司1575R的芯片资料，包括管脚说明和芯片数据，这在网上很难找，我当时找了很久，而官网是韩文的，所以不易
This is the gps chip US-TECH 1575R chip companies, including chip pin description and data, which is hard to find online, I was looking for a long time, and the official website is in Korean, so easy (2011-04-03, PDF, 256KB, 下载42次)
GPS 个人跟踪器，对弱势人群非常重要，小学生 老年人 病人的监控是非常适合的，配合现代通信网络才使这成为可能
GPS personal tracking device to the disadvantaged groups is very important for students to monitor elderly patients is very suitable to meet the modern communications network to make this possible (2010-02-26, PDF, 1091KB, 下载8次)
一个GPS网WGS_84平差坐标向地方独立坐标的转换文档，比较全
A GPS network adjustment WGS_84 independent coordinates to local coordinates of the conversion document, compare the whole (2008-09-13, PDF, 192KB, 下载36次)