宽带认知雷达中低截获概率波形设计理论与方法研究
发布时间：2019-06-04 18:00
【摘要】：认知雷达以及低截获技术被广泛应用到现代军事作战中,因为低截获雷达可以有效应付各种电磁干扰,避免雷达被敌方侦察机发现,提高了雷达在军事作战中的生存率,认知雷达是对低截获雷达又一个方向的提升,认知雷达技术加入到低截获雷达中可以有效提升整个雷达的性能。本文首先介绍了宽带认知雷达以及低截获技术的发展情况,然后重点对低截获技术这一块作了重点研究,推导了低截获概率因子以及影响低截获因子的参数,还讨论了一些实现低截获的理论方法,最后详细分析了组合波形的设计方法以及对优化后的波形的性能验证。在分析和设计低截获雷达波形时,本文首先对雷达低截获基础信号作了简要分析,然后对模糊函数作了介绍,由信号的模糊函数图来评定雷达信号的低截获性能和探测性能。非组合信号都不能满足低截获雷达信号多方面的要求,只有采用组合信号才能集多种信号的优点于一体,比如线性调频信号有多普勒距离耦合缺点和距离模糊图旁瓣不够低的缺点,有带宽比较宽的优点,二相编码有带宽较小的缺点,有距离模糊图旁瓣低的优点。结合上面两种信号设计出组合信号就可以综合两种信号的优点,而且通过模糊图得到了有效验证。最后本文新提出一种波形信号,对此信号的构造过程、模糊函数解析式推导,以及模糊图仿真都作了明确分析,得到了近似“图钉型”的模糊函数图,笔者还对该信号的探测性能、抗干扰性能以及其他综合性能进行了分析,比如速度、距离分辨力,多普勒敏感性,抗噪声特性等。最后采用现有的时频分析方法对新提出的信号作了仿真分析,并且验证了该信号比一般组合信号更优越的特性,比如比线性调频与二相编码组合信号明显在时频分析图上更加难辨别。
[Abstract]:Cognitive radar and low interception technology are widely used in modern military operations, because low interception radar can effectively cope with all kinds of electromagnetic interference, avoid radar being found by enemy reconnaissance aircraft, and improve the survival rate of radar in military operations. Cognitive radar is another direction of low interception radar. Cognitive radar technology can effectively improve the performance of the whole radar. This paper first introduces the development of broadband cognitive radar and low interception technology, then focuses on the low interception technology, deduces the low interception probability factor and the parameters that affect the low interception factor. Some theoretical methods to realize low interception are also discussed. finally, the design method of combined waveform and the performance verification of optimized waveform are analyzed in detail. When analyzing and designing the waveform of low interception radar, this paper first makes a brief analysis of the basic signal of radar low interception, and then introduces the fuzzy function. The low interception performance and detection performance of radar signal are evaluated by the fuzzy function diagram of the signal. The non-combination signal can not meet the requirements of low interception radar signal in many aspects, only by using the combined signal can we integrate the advantages of many kinds of signals. For example, LFM signal has the disadvantages of Doppler range coupling and range fuzzy graph sidelobe is not low enough, has the advantage of wide bandwidth, two-phase coding has the disadvantage of small bandwidth, and has the advantage of low range fuzzy graph sidelobe. Combined with the above two kinds of signals, the combined signals can synthesize the advantages of the two signals, and the fuzzy graph is used to verify the advantages of the two signals. Finally, a new kind of waveform signal is proposed in this paper. The construction process of the signal, the derivation of the analytical formula of the fuzzy function and the simulation of the fuzzy graph are analyzed clearly, and the fuzzy function diagram approximate to the "nail type" is obtained. The detection performance, anti-interference performance and other comprehensive performance of the signal are also analyzed, such as velocity, range resolution, Doppler sensitivity, anti-noise characteristics and so on. Finally, the existing time-frequency analysis method is used to simulate and analyze the newly proposed signal, and the better characteristics of the signal than the general combined signal are verified. For example, it is more difficult to distinguish the combined signal of linear frequency modulation and two-phase coding on the time-frequency analysis diagram.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
本文编号：2492897
[Abstract]:Cognitive radar and low interception technology are widely used in modern military operations, because low interception radar can effectively cope with all kinds of electromagnetic interference, avoid radar being found by enemy reconnaissance aircraft, and improve the survival rate of radar in military operations. Cognitive radar is another direction of low interception radar. Cognitive radar technology can effectively improve the performance of the whole radar. This paper first introduces the development of broadband cognitive radar and low interception technology, then focuses on the low interception technology, deduces the low interception probability factor and the parameters that affect the low interception factor. Some theoretical methods to realize low interception are also discussed. finally, the design method of combined waveform and the performance verification of optimized waveform are analyzed in detail. When analyzing and designing the waveform of low interception radar, this paper first makes a brief analysis of the basic signal of radar low interception, and then introduces the fuzzy function. The low interception performance and detection performance of radar signal are evaluated by the fuzzy function diagram of the signal. The non-combination signal can not meet the requirements of low interception radar signal in many aspects, only by using the combined signal can we integrate the advantages of many kinds of signals. For example, LFM signal has the disadvantages of Doppler range coupling and range fuzzy graph sidelobe is not low enough, has the advantage of wide bandwidth, two-phase coding has the disadvantage of small bandwidth, and has the advantage of low range fuzzy graph sidelobe. Combined with the above two kinds of signals, the combined signals can synthesize the advantages of the two signals, and the fuzzy graph is used to verify the advantages of the two signals. Finally, a new kind of waveform signal is proposed in this paper. The construction process of the signal, the derivation of the analytical formula of the fuzzy function and the simulation of the fuzzy graph are analyzed clearly, and the fuzzy function diagram approximate to the "nail type" is obtained. The detection performance, anti-interference performance and other comprehensive performance of the signal are also analyzed, such as velocity, range resolution, Doppler sensitivity, anti-noise characteristics and so on. Finally, the existing time-frequency analysis method is used to simulate and analyze the newly proposed signal, and the better characteristics of the signal than the general combined signal are verified. For example, it is more difficult to distinguish the combined signal of linear frequency modulation and two-phase coding on the time-frequency analysis diagram.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
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