混沌编码OFDM雷达信号的设计与分析
发布时间：2018-08-04 09:39
【摘要】：近几年来,雷达成为目标侦察与探测、跟踪与制导的重要工具,受到国防军事需求的牵引以及科学技术进步的驱动,发展速度极其迅猛,新体制雷达种类层出不穷。雷达研究领域中抗干扰性能和距离高分辨一直是雷达研究者密切关注的焦点问题。本文提出的一种新体制雷达混沌编码OFDM信号可以保证具有良好的抗干扰性能与较高的距离分辨力。混沌编码OFDM信号是将混沌序列以相位编码的形式编入到正交频分复用信号之中。混沌序列是一种看似无序其实有序的一组确定映射关系,拥有较好的自相关性并且难以被敌方接受机所截获与破解,而正交频分复用信号,即OFDM信号,则是一种多载频信号,每个载频都满足正交关系,OFDM信号有较大的合成带宽,还拥有较高的频谱利用率。所以将混沌与OFDM加以结合,设计出一种难以截获破解且合成带宽大的混沌编码OFDM信号。本文可以分为三个部分:分别为混沌编码OFDM信号的设计及混沌编码OFDM信号的处理与分析。在第一部分中,主要介绍了混沌理论和OFDM信号的基本原理,并给出了混沌编码OFDM雷达信号形式。针对此类信号的相关性,模糊函数和包络峰的基本概念加以阐述与推论,提出了改善包络峰均比的方法,最后分析并设定了此类信号的参数。在第二部分中,主要介绍了混沌编码OFDM信号的回波处理过程,讨论了信号的低截获概率特性,并对此信号的抗压制干扰性能进行了分析与仿真验证。最后介绍了基于空时自适应处理(STAP)的混沌编码OFDM信号的杂波抑制性能分析。在第三部分中,主要阐述了本文的不足之处,并对后续工作方向提出建议。
[Abstract]:In recent years, radar has become an important tool for target reconnaissance and detection, tracking and guidance, driven by the military requirements of national defense and the progress of science and technology. Anti-jamming performance and high range resolution in radar research field have been the focus of radar researchers. In this paper, a new radar chaotic coded OFDM signal is proposed, which can guarantee good anti-jamming performance and high range resolution. Chaotic coded OFDM signals are coded in the form of phase coding to orthogonal frequency division multiplexing (OFDM) signals. Chaotic sequences are a set of deterministic mapping relationships which appear to be in an ordered order, which have good autocorrelation and are difficult to be intercepted and deciphered by enemy aircraft. The orthogonal frequency division multiplexing (OFDM) signal is a kind of multi-carrier frequency signal, while the orthogonal frequency division multiplexing (OFDM) signal is a kind of multi-carrier frequency signal. Each carrier frequency satisfies the orthogonal relation OFDM signal has the big synthesis bandwidth, also has the high spectrum efficiency. So a chaotic coded OFDM signal which is difficult to intercept and has large synthesis bandwidth is designed by combining chaos with OFDM. This paper can be divided into three parts: the design of chaotic coded OFDM signal and the processing and analysis of chaotic coded OFDM signal. In the first part, the chaos theory and the basic principle of OFDM signal are introduced, and the chaotic coded OFDM radar signal form is given. Aiming at the correlation of this kind of signal, the basic concepts of fuzzy function and envelope peak are expounded and inferred, and a method to improve the envelope peak to average ratio is put forward. Finally, the parameters of this kind of signal are analyzed and set. In the second part, the echo processing process of chaotic coded OFDM signal is introduced, and the characteristics of low probability of interception are discussed, and the anti-suppression interference performance of the signal is analyzed and verified by simulation. Finally, the clutter suppression performance of chaotic coded OFDM signal based on space-time adaptive processing (STAP) is introduced. In the third part, the deficiency of this paper is discussed, and some suggestions on the future work are put forward.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN957.51
[Abstract]:In recent years, radar has become an important tool for target reconnaissance and detection, tracking and guidance, driven by the military requirements of national defense and the progress of science and technology. Anti-jamming performance and high range resolution in radar research field have been the focus of radar researchers. In this paper, a new radar chaotic coded OFDM signal is proposed, which can guarantee good anti-jamming performance and high range resolution. Chaotic coded OFDM signals are coded in the form of phase coding to orthogonal frequency division multiplexing (OFDM) signals. Chaotic sequences are a set of deterministic mapping relationships which appear to be in an ordered order, which have good autocorrelation and are difficult to be intercepted and deciphered by enemy aircraft. The orthogonal frequency division multiplexing (OFDM) signal is a kind of multi-carrier frequency signal, while the orthogonal frequency division multiplexing (OFDM) signal is a kind of multi-carrier frequency signal. Each carrier frequency satisfies the orthogonal relation OFDM signal has the big synthesis bandwidth, also has the high spectrum efficiency. So a chaotic coded OFDM signal which is difficult to intercept and has large synthesis bandwidth is designed by combining chaos with OFDM. This paper can be divided into three parts: the design of chaotic coded OFDM signal and the processing and analysis of chaotic coded OFDM signal. In the first part, the chaos theory and the basic principle of OFDM signal are introduced, and the chaotic coded OFDM radar signal form is given. Aiming at the correlation of this kind of signal, the basic concepts of fuzzy function and envelope peak are expounded and inferred, and a method to improve the envelope peak to average ratio is put forward. Finally, the parameters of this kind of signal are analyzed and set. In the second part, the echo processing process of chaotic coded OFDM signal is introduced, and the characteristics of low probability of interception are discussed, and the anti-suppression interference performance of the signal is analyzed and verified by simulation. Finally, the clutter suppression performance of chaotic coded OFDM signal based on space-time adaptive processing (STAP) is introduced. In the third part, the deficiency of this paper is discussed, and some suggestions on the future work are put forward.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN957.51
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