【正文】 ................................................................................... 10 第 2 章衛(wèi)星定位系統(tǒng)相關(guān)技術(shù) .................................................................................. 10 GLONASS(格魯納斯 )衛(wèi)星定位系統(tǒng) .................................................................. 10 系統(tǒng)組成 ........................................................................................... 10 技術(shù)特點(diǎn) ........................................................................................... 11 伽利略衛(wèi)星定位系統(tǒng) ................................................................................... 11 系統(tǒng)組成 ........................................................................................... 12 中國(guó)“北斗”導(dǎo)航系統(tǒng) ............................................................................... 12 系統(tǒng)組成 ............................................................................................. 12 技術(shù)特點(diǎn) ............................................................................................. 12 定位原理 ............................................................................................. 13 2. 4 GPS 衛(wèi)星定位系統(tǒng) ...................................................................................... 14 GPS 系統(tǒng)的組成 ................................................................................ 14 技術(shù)特點(diǎn) ............................................................................................. 15 定位原理 ............................................................................................. 16 目前各種衛(wèi)星定位系統(tǒng)的比較 .................................................................... 18 2. 6 GPS 系統(tǒng)的優(yōu)點(diǎn) .......................................................................................... 19 2. 7 GPS 通信協(xié)議 .............................................................................................. 19 第 3 章系統(tǒng)總體設(shè)計(jì) .................................................................................................. 20 系統(tǒng)功能 ........................................................................................................ 20 系統(tǒng)的組成 .................................................................................................... 21 系統(tǒng)方案選取 ................................................................................................ 21 常見(jiàn)導(dǎo)航定位系統(tǒng)實(shí)現(xiàn)方案 ............................................................. 21 定位導(dǎo)航終端的硬件模塊的選取 ................................................................ 22 單片機(jī)的選取 ..................................................................................... 22 GPS 模塊的選取 ................................................................................ 22 液晶顯示模塊的選取 ......................................................................... 23 第 4 章系統(tǒng)硬件設(shè)計(jì) .................................................................................................. 23 系統(tǒng)終端的總體硬件結(jié)構(gòu) ............................................................................ 23 GPS 接收板的設(shè)計(jì) ............................................................................ 23 單片機(jī)控制模塊設(shè)計(jì) ......................................................................... 24 LCD 模塊電路設(shè)計(jì) ............................................................................ 25 4. 2 GPS 接收板設(shè)計(jì) .......................................................................................... 25 GPS 模塊 LEA5H 介紹 .................................................................... 25 天線的選取 ......................................................................................... 28 阻抗設(shè)計(jì) ............................................................................................. 29 4. 2. 4 電源供電模塊設(shè)計(jì) ........................................................................... 29 RS232 串口模塊設(shè)計(jì) ...................................................................... 30 工作指示電路設(shè)計(jì) ............................................................................. 31 4. 3 單片機(jī)控制模塊設(shè)計(jì) ................................................................................... 32 4. 單片機(jī) C8051F020 介紹 ................................................................... 32 4. C8051 F020 單片機(jī)的接口電路設(shè)計(jì) ............................................... 35 RS232C 串口模塊設(shè)計(jì) .............................................................................. 37 RS232C 總線標(biāo)準(zhǔn)與電氣特性 ....................................................... 37 串行口電平轉(zhuǎn)換芯片的選取 ............................................................. 37 4. 5 LCD 顯示模塊 .............................................................................................. 38 4. 5. 1 OCM12864 介紹 .............................................................................. 38 4. 5. 2 LCD 顯示模塊與 C8051F020 單片機(jī) 硬件接口設(shè)計(jì) ..................... 39 系統(tǒng)抗干擾設(shè)計(jì) ............................................................................................ 40 PCB 抗干擾設(shè)計(jì) ................................................................................ 40 軟件抗干擾設(shè)計(jì) ................................................................................. 41 第 5 章 系統(tǒng)的軟件設(shè)計(jì) .............................................................................................. 41 5. 1 系統(tǒng)時(shí)鐘初始化 ........................................................................................... 41 1/0 口的初始化 ............................................................................................. 42 UARTO 的初始化 ......................................................................................... 44 5. 4 LCD 模塊的初始化 ...................................................................................... 45 指令描述 ............................................................................................. 45 接口時(shí)序 ............................................................................................. 47 LCD 模塊的初始化程序 [Zs} ............................................................ 48 第 6 章系統(tǒng)調(diào)試及結(jié)論 .........................................