自适应跳频通信系统的研究与仿真
自适应跳频通信系统的研究与仿真(任务书,开题报告,论文16000字)
摘 要
跳频通信因其抗干扰、抗多径、抗噪声、抗截获等优点，在民用和军用环境中，都被大量的应用，已然成为当前通信领域的一种主流技术。但是，由于现代信号处理技术的飞速进步，如今敌方干扰机能够快速地锁定跳频频率集，并加以针对性的干扰，这使得传统跳频通信无法有效保障通信的安全性。
在传统的跳频通信基础上，自适应跳频通信添加了实时信道质量检测评估技术和自适应控制技术，可以根据信道质量来实时更新跳频频率表，自动避开被干扰信道，大大提高了系统的抗干扰能力以及抗截获能力，有效实现优质通信。
在本论文中，对自适应跳频通信系统的系统构成和工作原理做了详细研究，重点讨论了其中的关键性技术。通过MATLAB建立了自适应跳频通信系统仿真模型，能够实现实时监测信道质量，并自适应地控制不停跳变的跳频载波频率。本文还研究了在不同干扰情况下自适应跳频通信系统的抗干扰性能，研究结果表明，自适应跳频通信的抗干扰性能要优越于常规跳频通信。
关键词：自适应跳频通信；实时信道检测；频率自适应控制
Abstract
Because of its advantages of anti-jamming, anti-multipath, anti-noise, and anti-interception, frequency-hopping communication has been widely used in civil and military environments, and has become a mainstream technology in the current communication field. However, due to the rapid progress of modern signal processing technology, the enemy jammer can quickly lock the frequency-hopping frequency set and perform targeted interference, which makes conventional frequency-hopping communication can’t guarantee the security of communication.
Based on conventional frequency-hopping communication,Adaptive frequency-hopping communicationintroduces not only the real-time channel quality detection and evaluation techniques but also adaptive control technology. It can update the frequency-hoppingfrequency table in real time according to the channel quality, so thatthe interfered channelcould be automatically avoided.Thatgreatly improves the system's anti-interception and anti-jamming capabilities. The high-quality communication will be held effectively too.
In this dissertation, the system structure and working principle of adaptive frequency-hopping communication system are studied in detail, and the key technologies are discussed as well. The adaptive frequency-hopping communication system simulation model was built by MATLAB software. It can monitor the channel quality in real time and adaptively control the frequency-hopping carrier’ frequency. This paper also studies the anti-interference performance of adaptive frequency-hopping communication systems under different interference conditions. The results show that the anti-jamming performance of adaptive frequency-hopping communication is superior to that of conventional frequency-hopping communication.
Key Words：adaptive frequency-hopping communication；real-time channel detection；
adaptive frequency control
目录
第1章 绪论 1
1.1 课题研究的目的及意义 1
1.2 自适应跳频通信系统概述及发展现状 1
1.3 研究内容及章节安排 2
第2章 跳频通信 3
2.1 跳频通信基本原理 3
2.2 跳频通信系统构成 4
2.3 跳频通信关键技术 6
2.3.1伪随机码跳频序列 6
2.3.2 频率合成技术 7
2.3.3跳频同步技术 8
第3章 自适应跳频通信 9
3.1 自适应跳频通信的基本原理 9
3.2 自适应跳频通信系统构成 9
3.3 自适应跳频通信关键技术 10
3.3.1 实时信道评估技术 10
3.3.2 频率自适应控制技术 12
第4章 自适应跳频通信系统仿真及性能分析 14
4.1 系统仿真模型 14
4.1.1 原始信号及调制信号生成模块 17
4.1.2 跳频载波模块 18
4.1.3 跳频、信道干扰及解跳模块 19
4.1.4 信道质量评估和频率自控制模块 21
4.1.5 相干解调和采样判决模块 21
4.1.6 误码率计算模块 23
4.2 系统仿真结果 23
4.3 系统性能分析 25
第5章 结论 26
参考文献 27
致 谢 28