差分跳频通信系统机理与仿真

摘 要

差分跳频是近年来出现的一种新型扩频通信技术，它集跳频图案、信息调制与解调功能于一体，构成与传统跳频技术完全不同的技术体制。差分跳频凭借其具有数字化程度高、传输范围广、极易实现高跳速和高数据率、抗跟踪干扰能力强等优点，在现在通信，特别是军事通信中得到了广泛应用，是近些年来的研究热点。

跳频通信技术凭借其具有很强的抗搜索、抗截获、抗干扰能力，兼有能多址组网应用等诸多优点,在现代军事通信尤其在短波战术抗干扰电台中获得了广泛的应用。但因短波信道存在着严重的多径干扰和多种衰落，使得传统短波跳频通信数据传输速率不高。加之传统短波通信设备的带宽窄，换频调谐速度较慢，使得传统跳频通信在短波波段的应用受到了限制。为了克服传统跳频通信的种种不足，差分跳频通信应运而生。

在差分跳频系统中，对发送数据进行频率编码，利用频率之间的转换关系来传递信息；接收端也是根据频率之间的关系来还原数据信息，这正是差分跳频区别于常规跳频最重要的一点。为此，本文在对差分跳频通信的发展现状分析基础上，重点研究了了差分跳频通信的基本原理及系统组成。针对G函数算法、G-1函数算法及FFT检测等进行了详细的分析与研究。最后，在理论研究基础上，进行了基于MATLAB的差分跳频通信仿真系统关键模块的设计与实现，并对仿真结果进行了详细分析，验证了仿真系统关键模块的正确性与有效性。

关键词：差分跳频；G函数；G-1函数；FFT检测

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Abstract

Differential frequency hopping coming in recent years is a new type of spread spectrum communication. It integrates the frequency hopping pattern, the information modulation and demodulation functions, and it’s absolutely different from traditional frequency hopping on technology system. With its advantages, including high digital degree, wide transmission range, easy to achieve high hop rate and high data rate, strong anti-interference ability to tracking jamming, and so on, differential frequency hopping is widely used in the present communication, especially in military communications, and it becomes a study hotspot in recent years.

Depending on its many advantages, including the strong abilities of anti-scout, anti-interception, anti-interference, and multiple access network applications, frequency hopping communication technology has been widely applied in the modern military communications, especially in the short-wave tactical anti-interference radio. But there are serious multi-path interference and multiple fading in short-wave frequency channel, the data transfer rate of traditional frequency hopping is low. And additionally, because the bandwidth is narrow, and the frequency tuning speed is slow for traditional short-wave communication equipment, the application of traditional frequency hopping communication in short-wave frequency channel has been limited. In order to overcome these shortcomings of traditional frequency hopping communication, the differential frequency hopping communications comes into being.

In the differential frequency hopping system, the transmitted data is encoded by frequency, using the transform relationship between the frequency to transmit information, and receiver regains data information based on the relationship between the frequency, which is the most important different from traditional frequency hopping. Therefore, based on the analysis of its development situation，the basic principle and communication process of differential frequency hopping communication are mainly studied in this article. And moreover, the algorithm for function G and function G-1, and the FFT detection are analyzed and researched in detail. Finally, based on theory study, the critical modules of differential frequency hopping communications simulation system are designed and realized based on the MATLAB platform, and the simulation results are analyzed in detail. By the simulation results,

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the correctness and effectiveness of the critical modules are validated.

Key words: Differential frequency hopping; Function G; Function G-1; FFT detection

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目 录

1 绪 论 ................................................................................................................................. 1

1.1 课题背景及意义 ......................................................................................................... 1 1.2 国内外研究现状 ......................................................................................................... 2

1.2.1短波通信系统发展现状 .................................................................................... 2 1.2.2差分跳频通信系统发展现状 ............................................................................ 3 1.3 论文内容简述 ............................................................................................................. 5 2 差分跳频通信系统原理及组成 ........................................................................................... 6

2.1差分跳频通信系统概述 .............................................................................................. 6

2.1.1差分跳频通信系统分类 .................................................................................... 6 2.1.2差分跳频通信系统基本特点 ............................................................................ 7 2.1.3差分跳频通信系统抗干扰性能 ........................................................................ 8 2.1.4制约差分跳频跳速的因素 ................................................................................ 9 2.1.5差分跳频通信系统组网性能 .......................................................................... 10 2.2差分跳频通信系统基本原理 .................................................................................... 10 2.3 差分跳频通信系统组成 ........................................................................................... 12 2.4 短波信道特点 .................................................................................................. …… 此处隐藏：6342字，全部文档内容请下载后查看。喜欢就下载吧 ……