![](https://csdnimg.cn/release/download_crawler_static/88025366/bg7.jpg)
目 录
1 引言 ............................................................................................................................1
1.1 背景和意义......................................................................................................1
1.2 本课题研究的意义..........................................................................................1
1.3 扩频技术的现状..............................................................................................2
1.4 论文结构安排..................................................................................................2
2 扩频通信 ....................................................................................................................3
2.1 扩频通信技术..................................................................................................3
2.2 扩频通信原理..................................................................................................3
2.2.1 锁相环解调原理.......................................................................................5
2.2.2 载波同步...................................................................................................6
2.3 COSTAS 锁相环....................................................................................................7
3 GUI 图形界面..........................................................................................................10
3.1 图形用户界面(GUI)的优势 ....................................................................10
3.2 GUI 界面简述...................................................................................................10
3.2.1 GUI 的特点................................................................................................11
3.3 图形用户界面(GUI)设计 ........................................................................11
3.3.1 GUI 设计原理............................................................................................11
3.3.2 图形用户界面设计窗口.........................................................................11
4 基于 MATLB GUI 的 COSTAS 环性能演示........................................................14
4.1 基本思路........................................................................................................14
5 效果图及分析 ..........................................................................................................14
5.1 COSTAS 环性能分析..........................................................................................14
5.1.1 信噪比系数影响.....................................................................................15
5.1.2 实际信号频率参数影响.........................................................................16
5.2 GUI 的 COSTAS 环的设计窗口 ........................................................................18
6 结论 ..........................................................................................................................20
参考文献 .........................................................................................................................22
致 谢 .........................................................................................................................23
附 录 .........................................................................................................................24