【作者】 李金涛；

【导师】 汪晓宁；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 跳频通信是最常用的扩展频谱通信方式之一，其原理是通过一组伪随机序列控制载波频率随机跳变来实现通信收发双方的通信。跳频通信具有抗干扰、抗衰落、抗截获、码分多址及频带共享的特点，在现代军事通信及民用移动通信中都有广泛的应用。跳频序列的设计是跳频通信的关键技术之一。跳频序列的作用是构成跳频指令(跳频图案)控制频率跳变以实现频谱扩展和跳频电台组网时作为地址码。跳频序列的性质包括跳频序列的频率数目、跳频序列族的多少、跳频序列的汉明自相关／互相关、跳频间隔、跳频序列的平衡性等，这些性质直接影响到系统的抗截获、抗干扰、同步等性能以及系统的组网能力。跳频序列一般由同余理论、有限域理论及混沌理论构造，作为跳频用的码有多种，如m序列、RS码、GOLD码、M序列及混沌序列等，在实际的系统中究竟选择哪一种跳频码，要根据所研制的跳频通信系统的用途而定。基于跳频序列对跳频通信的重要影响，本文围绕跳频序列的理论、跳频序列设计的理论限、基于不同序列设计跳频序列的方法等方面展开了深入的研究，特别是在序列的宽间隔处理方法等方面进行了一些探索式的研究，分别基于m序列、RS码和混沌序列提出了新的宽间隔处理方法构造了性能优良的跳频序列。具体说来，本文研究工作分为五部分。第一部分，总结了跳频通信系统的原理、主要技术指标、跳频通信的优点、跳频通信系统的国内外研究现状及跳频序列设计的研究现状。第二部分，分析和总结了跳频序列的作用、性能指标、设计要求及宽间隔跳频序列的理论。第三部分，基于利用非连续抽头模型生成的m序列，提出了非线性模d法的宽间隔处理方法，设计一类新的宽间隔跳频序列，并对此序列的性能与用对偶法构造的宽间隔序列的性能进行了比较分析。第四部分，首先基于(L，2)RS码设计了一类新的非重复跳频序列族，然后利用矩阵变换的方法进一步优化了设计的序列，调整了频率间的跳频间隔，最后基于优化后的非重复序列提出了多次非重复挑选构造宽间隔非重复序列的方法，同时分析了以上构造的几种序列的部分性能；第五部分，首先分析比较了基于混沌映射构造跳频序列的多种映射类型及量化方法，然后提出了基于级联映射、抽取位置随机变化的2k比特量化生成跳频序列的方法，并分析了此方法构造的序列的性能，最后提出了基于此方法构造的混沌跳频序列的宽间隔处理方法，同时分析了构造的宽间隔跳频序列的性能等。更多还原

【Abstract】 The frequency hopping (FH) communication is one of spreading spectrum communication models. It’s hopping carries frequencies are controlled by pseudo noise (PN) sequences. The FH communication is widely applied in modern military and civil communications because of its advantages such as anti-jamming, anti-fade, anti-capturing, channel sharing properties, and multi-access networking etc.The frequency hopping sequences design is one of the key points of the FH communication system. The properties of FH sequences including frequencies number, sequences families number, Hamming cross-correction, Hamming auto-correction, frequencies gap and frequencies proportional etc, have a direct influence on FH communication system’s abilities of anti-jamming, anti-fade, anti-capturing, and mufti-access networking etc. The function of FH sequences is constructing frequency hopping pattern to control carries frequencies or play a role as address code in multi-access networking. Usually FH sequences are made over same residue, area of GF (pr), or chaos theory. There are many sequences that can be used in FH communication, such as m sequence, RS code, Gold code, M sequence, chaos sequence etc. And which sequence is chose to use in practice is decided by the intention of communication.In this thesis, these sequences topics related to the theory of FH communication systems are investigated, which are the theories of FH sequences, the theoretical bounds to sequence designs, the methods of sequence designs based on different sequences .And new constructive methods of designing FH sequences based on m sequence, RS code, chaos sequence, which are mainly improved the frequencies gap, are provided in this paper.In detail, this paper is made up of five parts. Firstly, the principle, main technical properties, advantages of FH communication, the status quo of FH communication system design and frequencies design are summarized. Secondly, the FH sequences’ functions, properties, design demands and theories of FH frequences with given minimum gap are summarized and analyzed.Thirdly, a method to improve frequencies gaps, which is named nonlinear &mod d method, is provided. New ameliorated sequences are constructed, which are based on m sequences, used no continual model, and its prosperities is also be analyzed. In the fourth part, firstly, we designed a new non-repeating FH sequences based on (L,2)RS code. During the design proceeding, in order to resolve frequencies’ in-equable interval, a new method is given! Then, a new method to construct non-repeating sequences with given minimum gap is given. And its prosperities is also be analyzed. In the last part, several classes of chaos maps and quantified methods are compared with and analyzed. A new method to design chaos FH frequencies, which is based on combined chaos maps and mid 2k-bites quantified, is provided. In order to improve the sequences’ properties, an improved given gap method is also suggested. And the sequences’ properties are summarized and analyzed.更多还原