基于跳扩结合的军用超短波电台抗干扰性能改进研究
发布时间：2019-03-07 08:21
【摘要】：直扩/跳频（DS/FH）混合扩频通信系统通过把直接序列扩频技术和跳频扩频技术相结合，不仅利用直接序列扩频使信号的功率谱密度低于噪声功率谱密度，从而达到保密的目的，而且利用跳频扩频获得了超大的频谱宽度，使系统具有很强的抗干扰能力。在本论文中，主要研究了DS/FH混合扩频通信系统六个方面的问题：扩频序列的产生、调制方式的选择、干扰模式的应用、仿真模型的建立、抗干扰性能的分析以及抗干扰电台改进性设计。 本论文的主要研究内容和所做的工作如下： 1、对各种扩频序列的特性分析及比较。将扩频通信系统中所能使用的各种扩频序列进行分析比较，并归纳总结了各自的优缺点和适用性。最终选取具有代表性的m序列、Gold序列、Walsh序列以及混沌序列作为扩频序列，以研究DS/FH混合扩频通信系统的抗干扰性能。 2、对各种数字调制方式的特点分析与比较。在分析了多种数字调制方式特点的基础上进行比较，同样总结出各自的优缺点。最终选取BPSK、QPSK、16PSK、2FSK、MSK以及GMSK这六种调制作为DS/FH混合扩频通信系统的调制方式，来进一步研究系统的抗干扰性能。 3、对超短波通信的干扰模式及其抗干扰措施的针对性研究。分析了各种干扰模式，归纳了不同抗干扰技术措施的应用特点，确定选取对跳、扩频通信威胁严重的扫频、跟踪以及扫频与跟踪叠加的三种干扰作为对DS/FH混合扩频通信系统的干扰模式。 4、建立DS、FH和DS/FH混合扩频通信系统的仿真模型。依据跳、扩频通信系统各自的组成，采用MATLAB/Simulink搭建了DS、FH和DS/FH混合扩频通信系统的仿真模型，，并对模型中的关键子模块进行了设计分析。 5、对DS/FH混合扩频通信系统的抗干扰性能进行了仿真比较。主要从四个方面进行了比较研究，一是不同扩频序列对系统抗干扰性能的影响，二是不同调制方式对系统抗干扰性能的影响，三是不同干扰模式对系统抗干扰性能的影响，四是不同扩频系统抗干扰性能的特点比较。通过在不同扩频增益、不同跳频速率下对混合扩频系统的误码率进行仿真，得出了一些有利于对超短波电台抗干扰性能进行改进的结论。 6、对军用超短波抗干扰电台性能的改进性设计。依据本文对扩频通信系统所得的各种仿真结论以及对军用超短波抗干扰电台工作机理分析研究的基础上，指出现有电台在抗干扰性能方面的不足之处，并给出了改进性的建议与初步设计方案。这对于发挥军事通信电台的战斗效能、提高其战斗力具有重要意义。
[Abstract]:The direct sequence spread spectrum (DS/FH) hybrid spread spectrum communication system combines the direct sequence spread spectrum technique with the frequency hopping spread spectrum technology, and not only uses the direct sequence spread spectrum technology to make the power spectrum density of the signal lower than the noise power spectrum density, but also combines the direct sequence spread spectrum technique with the frequency hopping spread spectrum technology. In order to achieve the purpose of secrecy, and the use of frequency hopping spread spectrum to obtain a large spectrum width, so that the system has a strong anti-jamming capability. In this paper, six problems of DS/FH hybrid spread spectrum communication system are studied: the generation of spread spectrum sequence, the selection of modulation mode, the application of interference mode, the establishment of simulation model, and so on. Analysis of anti-jamming performance and improvement design of anti-jamming radio station. The main research contents and work are as follows: 1. The characteristics of various spread spectrum sequences are analyzed and compared. The spread spectrum sequences which can be used in the spread spectrum communication system are analyzed and compared, and their advantages and disadvantages and applicability are summarized. Finally, the representative m sequence, Gold sequence, Walsh sequence and chaotic sequence are selected as spreading sequences to study the anti-jamming performance of DS/FH hybrid spread spectrum communication system. Secondly, the characteristics of various digital modulation methods are analyzed and compared. On the basis of analyzing the characteristics of various digital modulation methods, the advantages and disadvantages of each are summarized. Finally, six kinds of modulation, BPSK,QPSK,16PSK,2FSK,MSK and GMSK, are selected as the modulation mode of DS/FH hybrid spread spectrum communication system to further study the anti-jamming performance of the system. Thirdly, the jamming mode and anti-jamming measures of ultrashort wave communication are studied. This paper analyzes all kinds of jamming modes, sums up the application characteristics of different anti-jamming technical measures, and selects the sweep which is serious threat to the hop and spread spectrum communication. The three jamming modes of tracking, scanning and tracking are used as interference modes for DS/FH hybrid spread spectrum communication system. 4. The simulation model of DS,FH and DS/FH hybrid spread spectrum communication system is established. According to the respective composition of the hop and spread spectrum communication system, the simulation model of the hybrid spread spectrum communication system of DS,FH and DS/FH is built by using MATLAB/Simulink, and the key sub-modules of the model are designed and analyzed. 5. The anti-jamming performance of DS/FH hybrid spread spectrum communication system is simulated and compared. The first is the influence of different spread spectrum sequences on the anti-jamming performance of the system, the second is the influence of different modulation methods on the anti-jamming performance of the system, the third is the influence of different interference modes on the anti-jamming performance of the system, and the other is the influence of different interference modes on the anti-jamming performance of the system. Fourthly, the characteristics of anti-jamming performance of different spread spectrum systems are compared. By simulating the bit error rate (BER) of hybrid spread spectrum system with different spread spectrum gain and frequency hopping rate, some conclusions which are beneficial to improve the anti-jamming performance of ultrashort wave radio are obtained. 6, the performance improvement design of military ultrashort wave anti-jamming radio station. Based on the simulation conclusions of the spread spectrum communication system and the analysis of the working mechanism of the military ultra-short wave anti-jamming radio station, this paper points out the shortcomings of the existing radio stations in the anti-jamming performance. At the same time, the improvement suggestion and the preliminary design scheme are given. This is of great significance to bring into play the combat effectiveness of military communication stations and improve their combat effectiveness.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN914.4
本文编号：2435937
[Abstract]:The direct sequence spread spectrum (DS/FH) hybrid spread spectrum communication system combines the direct sequence spread spectrum technique with the frequency hopping spread spectrum technology, and not only uses the direct sequence spread spectrum technology to make the power spectrum density of the signal lower than the noise power spectrum density, but also combines the direct sequence spread spectrum technique with the frequency hopping spread spectrum technology. In order to achieve the purpose of secrecy, and the use of frequency hopping spread spectrum to obtain a large spectrum width, so that the system has a strong anti-jamming capability. In this paper, six problems of DS/FH hybrid spread spectrum communication system are studied: the generation of spread spectrum sequence, the selection of modulation mode, the application of interference mode, the establishment of simulation model, and so on. Analysis of anti-jamming performance and improvement design of anti-jamming radio station. The main research contents and work are as follows: 1. The characteristics of various spread spectrum sequences are analyzed and compared. The spread spectrum sequences which can be used in the spread spectrum communication system are analyzed and compared, and their advantages and disadvantages and applicability are summarized. Finally, the representative m sequence, Gold sequence, Walsh sequence and chaotic sequence are selected as spreading sequences to study the anti-jamming performance of DS/FH hybrid spread spectrum communication system. Secondly, the characteristics of various digital modulation methods are analyzed and compared. On the basis of analyzing the characteristics of various digital modulation methods, the advantages and disadvantages of each are summarized. Finally, six kinds of modulation, BPSK,QPSK,16PSK,2FSK,MSK and GMSK, are selected as the modulation mode of DS/FH hybrid spread spectrum communication system to further study the anti-jamming performance of the system. Thirdly, the jamming mode and anti-jamming measures of ultrashort wave communication are studied. This paper analyzes all kinds of jamming modes, sums up the application characteristics of different anti-jamming technical measures, and selects the sweep which is serious threat to the hop and spread spectrum communication. The three jamming modes of tracking, scanning and tracking are used as interference modes for DS/FH hybrid spread spectrum communication system. 4. The simulation model of DS,FH and DS/FH hybrid spread spectrum communication system is established. According to the respective composition of the hop and spread spectrum communication system, the simulation model of the hybrid spread spectrum communication system of DS,FH and DS/FH is built by using MATLAB/Simulink, and the key sub-modules of the model are designed and analyzed. 5. The anti-jamming performance of DS/FH hybrid spread spectrum communication system is simulated and compared. The first is the influence of different spread spectrum sequences on the anti-jamming performance of the system, the second is the influence of different modulation methods on the anti-jamming performance of the system, the third is the influence of different interference modes on the anti-jamming performance of the system, and the other is the influence of different interference modes on the anti-jamming performance of the system. Fourthly, the characteristics of anti-jamming performance of different spread spectrum systems are compared. By simulating the bit error rate (BER) of hybrid spread spectrum system with different spread spectrum gain and frequency hopping rate, some conclusions which are beneficial to improve the anti-jamming performance of ultrashort wave radio are obtained. 6, the performance improvement design of military ultrashort wave anti-jamming radio station. Based on the simulation conclusions of the spread spectrum communication system and the analysis of the working mechanism of the military ultra-short wave anti-jamming radio station, this paper points out the shortcomings of the existing radio stations in the anti-jamming performance. At the same time, the improvement suggestion and the preliminary design scheme are given. This is of great significance to bring into play the combat effectiveness of military communication stations and improve their combat effectiveness.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN914.4
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