【摘要】：直擴(kuò)/跳頻（DS/FH）混合擴(kuò)頻通信系統(tǒng)通過(guò)把直接序列擴(kuò)頻技術(shù)和跳頻擴(kuò)頻技術(shù)相結(jié)合，不僅利用直接序列擴(kuò)頻使信號(hào)的功率譜密度低于噪聲功率譜密度，從而達(dá)到保密的目的，而且利用跳頻擴(kuò)頻獲得了超大的頻譜寬度，使系統(tǒng)具有很強(qiáng)的抗干擾能力。在本論文中，主要研究了DS/FH混合擴(kuò)頻通信系統(tǒng)六個(gè)方面的問(wèn)題：擴(kuò)頻序列的產(chǎn)生、調(diào)制方式的選擇、干擾模式的應(yīng)用、仿真模型的建立、抗干擾性能的分析以及抗干擾電臺(tái)改進(jìn)性設(shè)計(jì)。 本論文的主要研究?jī)?nèi)容和所做的工作如下： 1、對(duì)各種擴(kuò)頻序列的特性分析及比較。將擴(kuò)頻通信系統(tǒng)中所能使用的各種擴(kuò)頻序列進(jìn)行分析比較，并歸納總結(jié)了各自的優(yōu)缺點(diǎn)和適用性。最終選取具有代表性的m序列、Gold序列、Walsh序列以及混沌序列作為擴(kuò)頻序列，以研究DS/FH混合擴(kuò)頻通信系統(tǒng)的抗干擾性能。 2、對(duì)各種數(shù)字調(diào)制方式的特點(diǎn)分析與比較。在分析了多種數(shù)字調(diào)制方式特點(diǎn)的基礎(chǔ)上進(jìn)行比較，同樣總結(jié)出各自的優(yōu)缺點(diǎn)。最終選取BPSK、QPSK、16PSK、2FSK、MSK以及GMSK這六種調(diào)制作為DS/FH混合擴(kuò)頻通信系統(tǒng)的調(diào)制方式，來(lái)進(jìn)一步研究系統(tǒng)的抗干擾性能。 3、對(duì)超短波通信的干擾模式及其抗干擾措施的針對(duì)性研究。分析了各種干擾模式，歸納了不同抗干擾技術(shù)措施的應(yīng)用特點(diǎn)，確定選取對(duì)跳、擴(kuò)頻通信威脅嚴(yán)重的掃頻、跟蹤以及掃頻與跟蹤疊加的三種干擾作為對(duì)DS/FH混合擴(kuò)頻通信系統(tǒng)的干擾模式。 4、建立DS、FH和DS/FH混合擴(kuò)頻通信系統(tǒng)的仿真模型。依據(jù)跳、擴(kuò)頻通信系統(tǒng)各自的組成，采用MATLAB/Simulink搭建了DS、FH和DS/FH混合擴(kuò)頻通信系統(tǒng)的仿真模型，，并對(duì)模型中的關(guān)鍵子模塊進(jìn)行了設(shè)計(jì)分析。 5、對(duì)DS/FH混合擴(kuò)頻通信系統(tǒng)的抗干擾性能進(jìn)行了仿真比較。主要從四個(gè)方面進(jìn)行了比較研究，一是不同擴(kuò)頻序列對(duì)系統(tǒng)抗干擾性能的影響，二是不同調(diào)制方式對(duì)系統(tǒng)抗干擾性能的影響，三是不同干擾模式對(duì)系統(tǒng)抗干擾性能的影響，四是不同擴(kuò)頻系統(tǒng)抗干擾性能的特點(diǎn)比較。通過(guò)在不同擴(kuò)頻增益、不同跳頻速率下對(duì)混合擴(kuò)頻系統(tǒng)的誤碼率進(jìn)行仿真，得出了一些有利于對(duì)超短波電臺(tái)抗干擾性能進(jìn)行改進(jìn)的結(jié)論。 6、對(duì)軍用超短波抗干擾電臺(tái)性能的改進(jìn)性設(shè)計(jì)。依據(jù)本文對(duì)擴(kuò)頻通信系統(tǒng)所得的各種仿真結(jié)論以及對(duì)軍用超短波抗干擾電臺(tái)工作機(jī)理分析研究的基礎(chǔ)上，指出現(xiàn)有電臺(tái)在抗干擾性能方面的不足之處，并給出了改進(jìn)性的建議與初步設(shè)計(jì)方案。這對(duì)于發(fā)揮軍事通信電臺(tái)的戰(zhàn)斗效能、提高其戰(zhàn)斗力具有重要意義。
[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.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN914.4

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