低截获概率通信波形设计

发布时间：2018-02-15 22:52

本文关键词： 低截获概率波形设计抗干扰自适应调制扩频　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：在现代战争中,飞行器之间通信信息的隐蔽性是取得胜利的关键要素。为满足战场通信对低截获概率和抗干扰性能的需求,通信系统是否具有良好的低截获概率性能,就成了取得战争胜利的首要条件。低截获概率通信技术已经成为当代军事信息技术的热点。本文首先介绍了低截获概率通信波形的背景、发展与研究现状,介绍了低截获概率通信场景模型,阐述了低截获概率通信波形性能评估的基本方法。其次,具体研究了低截获概率波形相关技术的性能。这里先研究了信道编码技术的性能。仿真表明非二进制LDPC码,拥有较好的抗干扰能力,在信道条件不佳的情况下性能更好。随后分析了几种常见调制方式的误码率性能和低截获概率性能。介绍了自适应调制方案,根据反馈信道的信息对信号的调制方式进行选择和切换。接着分析了直接序列扩频系统的性能。仿真结果显示扩频因子越大,通信波形的截获距离越短,干扰的影响越小。之后,分析了跳频系统性能,对比了不同跳频序列,并对跳频系统在宽带干扰下性能进行了研究。仿真显示,跳频系统能够有效对抗宽带干扰。对于跟踪式干扰或跟踪式侦察,提高跳频速率能够有效躲避跟踪。然后,根据分析结果确定了整体波形设计方案：采用非二进制LDPC信道编码,自适应调制、直接序列扩频和宽间隔快跳频结合的波形方案,给出了根据实际场景和需求对具体技术的具体参数设置的建议。整体波形仿真表明所设计的方案能够显著提高系统的低截获概率性能。最后,使用Matlab的GUI套件实现了低截获概率波形仿真程序。平台可以实现两种场景实时仿真演示、跳频序列生成、性能仿真结果展示等功能。
[Abstract]:In modern warfare, the concealment of communication information between aircraft is the key element of victory. In order to meet the requirements of battlefield communication for low probability of interception and anti-jamming performance, whether the communication system has good performance of low probability of interception. LPI technology has become a hot topic in modern military information technology. Firstly, this paper introduces the background, development and research status of LPI waveform. The scene model of LPI communication is introduced, and the basic method to evaluate the waveform performance of LPI communication is described. Secondly, The performance of low probability of interception waveform correlation technology is studied. The performance of channel coding technique is studied first. The simulation results show that non-binary LDPC codes have good anti-jamming capability. The performance is better when the channel condition is not good. Then, the BER and LPI performance of several common modulation methods are analyzed, and the adaptive modulation scheme is introduced. The modulation mode of the signal is selected and switched according to the information of the feedback channel. Then the performance of the direct sequence spread spectrum system is analyzed. The simulation results show that the larger the spread spectrum factor is, the shorter the intercept distance of the communication waveform is. After analyzing the performance of FH system and comparing different FH sequences, the performance of FH system under wideband interference is studied. Frequency-hopping system can effectively resist wideband interference. For tracking jamming or tracking reconnaissance, increasing FH rate can effectively avoid tracking. Then, according to the analysis results, the overall waveform design scheme is determined: using non-binary LDPC channel coding, The waveform scheme of adaptive modulation, direct sequence spread spectrum and wide interval fast frequency hopping, The suggestions of setting the specific parameters of the specific technology according to the actual situation and requirements are given. The simulation of the whole waveform shows that the designed scheme can significantly improve the performance of the low probability of interception (LPI) of the system. The simulation program of low probability of interception waveform is implemented by using GUI package of Matlab. The platform can realize two kinds of scene real-time simulation demonstration, frequency hopping sequence generation, performance simulation result display and so on.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：E96;TN97

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