机载MIMO雷达正交波形设计及其检测性能研究

发布时间：2018-09-10 10:47

【摘要】：MIMO(Multi-input Multi-output)雷达是一种将多输入多输出通信技术与雷达技术相结合的新型雷达,它通过同时发射多个相互正交的波形,在接收端进行匹配滤波以及多波束形成完成对整个空间的观测。机载雷达有利于检测地面目标,而利用了MIMO雷达技术的机载雷达对于地面动目标有着更好的检测结果。本文在对机载MIMO雷达特点分析的基础上,深入研究了机载MIMO雷达发射波形设计及动目标检测技术,提出了相应的波形设计方法,并通过动目标检测技术分析了该波形的检测性能。本文的主要工作如下:1.针对Hybrid-LFM信号调频斜率仅包含正值的不足,提出了MMFS信号的模型,该波形拥有更大的斜率变化范围。2.针对机载MIMO雷达波形设计中所需要考虑的正交性以及多普勒容忍性的问题,提出了优化MMFS信号的遗传算法,使得优化后的MMFS信号相比Hybrid-LFM信号拥有更好的正交性、更低的自相关旁瓣峰值以及更低的多普勒敏感性。3.研究了机载MIMO雷达杂波建模方法和信号处理流程,给出了整个处理流程的数学公式。结合机载MIMO雷达系统的特点,对回波进行MTD处理,分析了MIMO雷达使用MMFS信号时的动目标检测性能。4.构建了机载MIMO雷达的仿真系统,实现了发射波形生成,杂波环境模拟以及动目标检测三个方面的功能。给出了系统实现框图,GUI界面布局,数据处理流程。最后,通过仿真验证了MMFS波形在正交性和多普勒容忍性方面的优势以及在机载MIMO雷达系统中的适应性。
[Abstract]:MIMO (Multi-input Multi-output) radar is a new type of radar, which combines multi-input and multi-output communication technology with radar technology. By simultaneously transmitting multiple orthogonal waveforms, matching filtering and multi-beam forming are carried out at the receiving end to complete the observation of the whole space. Airborne radar is advantageous to ground target detection, while airborne radar using MIMO radar technology has better detection results for ground moving target. Based on the analysis of the characteristics of airborne MIMO radar, the design of airborne MIMO radar transmitting waveform and the detection technology of moving target are studied in this paper, and the corresponding waveform design method is put forward. The detection performance of the waveform is analyzed by moving target detection technology. The main work of this paper is as follows: 1. Aiming at the deficiency that the frequency modulation slope of Hybrid-LFM signal contains only positive value, the model of MMFS signal is proposed. The waveform has a larger slope range. 2. Aiming at the problem of orthogonality and Doppler tolerance in waveform design of airborne MIMO radar, a genetic algorithm for optimizing MMFS signal is proposed, which makes the optimized MMFS signal have better orthogonality than Hybrid-LFM signal. Lower autocorrelation sidelobe peak and lower Doppler sensitivity. 3. The modeling method and signal processing flow of airborne MIMO radar clutter are studied, and the mathematical formulas of the whole processing flow are given. Combined with the characteristics of airborne MIMO radar system, the echo is processed by MTD, and the detection performance of moving target is analyzed when MIMO radar uses MMFS signal. The simulation system of airborne MIMO radar is constructed, which realizes three functions: waveform generation, clutter environment simulation and moving target detection. The system implementation diagram and GUI interface layout and data processing flow are given. Finally, the advantages of MMFS waveform in orthogonality and Doppler tolerance and adaptability in airborne MIMO radar system are verified by simulation.
【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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本文编号：2234218