摘 要：GPS是全球定位系统英文名词Global Positioning System的缩写。该系统是美国布设的第二代卫星无线电导航系统。它能为用户提供连续、实时、全球性、全天候、高精度的三维坐标、三向速度和时间信息。其目的是在全球范围内对地面和空中目标进行准确定位和监测。现在，GPS接收机作为一种先进的导航和定位仪器，已在军事及民用领域得到广泛的应用。本设计是基于AT89C51单片机来实现的简易GPS定位信息显示系统。本控制系统主要完成接受数据、时间显示、经度显示、纬度显示等常规功能。此方案基于LCD12864液晶显示屏、GPS模块和单片机等硬件, 并应用C语言实现了GPS信号的提取、显示及基本的键盘控制操作等。经过实践测试 ,这种接收机可以达到基本GPS信息的接收以及显示，可以做到精度高、连续导航，并可广泛应用于个人野外旅游探险、出租汽车定位及海上作业等领域。64392

毕业论文关键词：GPS接收机，单片机，液晶显示屏

ABSTRACT:GPS is the abbreviation of the English term Global Positioning System global positioning system. The system is the United States laid the second generation satellite radio navigation system. It can provide users with continuous, real-time, global, round-the-clock, high precision three dimensional coordinates, three velocity and time information. The purpose of the system is for accurate positioning and monitoring of ground and air targets on a global scale. Now, as an advanced GPS receiver navigation and positioning equipment, has a wide range of applications in military and civilian areas. This design based on the AT89C51 microcontroller is used to implement a simple GPS positioning information display system. This control system is mainly done to accept the data, time display, latitude, longitude, and other routine functions. This program is based on 12864 LCD display, GPS module, single-chip, and other hardware, and using C language to realize the GPS signal extraction, display and keyboard control of basic operations. Through practical test, this receiver can receive and display the basic GPS information. High accuracy, continuous navigation can be done, and the receiver can be widely applied to inpiduals in the wild tour adventure, hire car positioning ,operations at sea and other areas.

KEY WORDS:GPS receiver, microcontroller, LCD display

1  绪论 4

1.1  GPS的由来及发展 4

1.2  GPS定位系统的组成部分 4

1.3  GPS接收机模块定位流程 4

2  基于单片机的GPS接收机的硬件设计 4

2.1  AT89C51单片机 5

2.2  GR-87 GPS模块 5

2.3  显示部分 8

2.4  电源部分 10

2.5  晶体振荡器 10

2.6  复位电路 10

2.7  基于单片机的GPS接收机整个系统的连接介绍 10

3  基于单片机的GPS接收机的软件设计 11

3.1  系统程序流程图 11

3.2  NMEA-0183数据格式 12

3.3  基于单片机的GPS接收机的软件设计思路 15

3.4  基于单片机的GPS接收机的软件工具 16

4  仿真结果 17

5  实物图