梳状谱信号机理与仿真技术

理工大学学士学位论文I摘要扩频通信具有良好的抗干扰性、低截获概率及组网能力，因此扩频技术一出现，便在军事领域得到了极大的发展，提高了军事装备的抗截获和抗干扰能力，向通信对抗提出了严峻的挑战。其中，对扩频中跳频对抗技术开展的研究，寻求干扰跳频通信的方法，己成了当前通信对抗领域十分紧迫而困难的任务之一。目前对跳频通信系统干扰方式的研究包括部分频带压制式干扰、全频带压制式干扰、跟踪式干扰、对跳频同步系统的干扰、频率预测式干扰等。但其中最为常用也最为有效的依然是部分频带压制式干扰和全频带压制式干扰，而梳状谱干扰方法便是实现部分频带压制式干扰或全频带压制式干扰的一种最为常用的方法。因此，本文对跳频通信系统的部分频带干扰进行了理论分析和仿真研究。本文从扩频系统机理出发对跳频通信系统和直扩通信系统进行了研究，并分析了跳频通信系统干扰方式，其中最主要的是研究梳状谱干扰信号机理。文章从理论上分析了典型通信干扰对跳频通信系统的影响，包括全频段干扰、部分频带干扰、单音干扰、多音干扰、跟踪式干扰、频率预测式干扰等。此后展开对梳状谱信号机理的研究，在对跳频通信系统信号调制、跳频调制、同步捕获、同步跟踪、跳频解调、信号解调的仿真基础上，完成基于MATLAB的梳状谱信号仿真与跳频仿真，同时测试其对跳频通信系统的影响。关键词：扩频通信；跳频；直扩；梳状谱；MATLAB仿真理工大学学士学位论文IIAbstractSpreadspectrumcommunicationhassomeadvantages,suchasgoodanti-interferenceperformance,lowprobabilityofinterceptandnetworkingcapability.Assoonasthespreadspectrumtechnologyappeared,itiswidelydevelopedonthemilitaryside.Theadvancedtechnologycontributestotheanti-interferencepropertyandthelowprobabilityofintercept,puttingforwardseverechallengestocommunicationcountermeasure.Amongthecurrenttasks,researchingofcommunicationcountermeasureandfindingthemethodofreferencehavebecomethetoptopicinthecommunicationcountermeasurefield.Nowadays,thereareseveralinferencemethods,includingpartial-bandblanketinterference,fullbandblanketinterference,trackinginterference,frequencypredictedinterferenceandsoon.Themostimportantandefficientinterferenceispartial-bandblanketinterferenceorfullbandblanketinterference,whichiscommonlyusedintheworld.Therefore,thispaperhasagoodstudyonthetheoryandanalysisofpartial-bandblanketinterferencethroughsimulation.Thispaper,startingfromthemechanismoffrequencyhoppingcommunicationsystemandspreadspectrumcommunicationsystem,analyzestheinterferencemethodstoFHcommunicationsystem,anditsuppermoststudyisthemechanismofcombspectruminterferencesignal.Theimpactoftypicalcommunicationinterferenceonfrequencyhoppingcommunicationsystemisanalyzedinthepaper,includingfpartial-bandblanketinterference,fullbandblanketinterference,trackinginterference,frequencypredictedinterference,etc.Thepaperstudyonthemechanismofthecombspectrumsignalmainly.Basedonthesimulationoffrequencyhoppingcommunicationsystem,thispapercompletesthesimulationofcombspectrumandfrequencyhoppingsystem,dependingonMATLABsoftware,andtestingitsimpactonfrequencyhoppingcommunicationsystem.Keywords:Spreadspectrumcommunication;FH;DS;Combspectrum;MATLABsimulation理工大学学士学位论文III目录1绪论....................................................................................................................................11.1课题研究背景和意义................................................................................................11.2课题的研究历史与发展趋势....................................................................................21.2.1扩频通信技术简介..........................................................................................21.2.2扩频通信的发展历史......................................................................................21.2.3扩频通信的发展趋势......................................................................................31.2.4扩频对抗技术的发展......................................................................................41.3论文结构及安排........................................................................................................52扩频通信系统机理研究......................................................................................................62.1扩频通信理论基础....................................................................................................62.2直扩通信系统的机理................................................................................................72.2.1直扩通信系统的原理......................................................................................72.2.2直扩系统的同步原理......................................................................................82.3跳频通信系统的机理..............................................................................................142.3.1跳频通信系统的原理....................................................................................142.3.2跳频同步技术研究........................................................................................173扩频通信对抗技术研究....................................................................................................213.1扩频通信的干扰技术及性能度量指标..................................................................213.1.1扩频通信干扰技术概述................................................................................213.1.2干扰效果度量指标........................................................................................233.2全频带干扰..............................................................................................................253.3部分频带干扰..........................................................................................................263.4单音干扰..................................................................................................................273.5多音干扰..................................................................................................................293.6频率跟踪瞄准式干扰......................................................