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参差MTI优化设计及硬件实现

发布时间:2018-11-19 07:20
【摘要】:随着社会发展和科技的进步,雷达无论是在军事领域还是日常生活中都有着广阔的应用前景,从战争角度剖析,我们对雷达的要求是能够及时、有效地处理目标回波信号,从而实现对大批量运动目标的实时、有效搜索与跟踪,即要对回波信号进行合理的处理,提取出我们需要的目标参数,抑制掉我们不需要的杂波干扰信息,以实现引导火炮,导弹等武器对目标实施攻击。因此,雷达系统能否在复杂的电磁环境中发挥应有的效能,已经成为军民用电子设备的一个亟须解决的问题。在雷达接收的回波信号当中,除了目标信号,往往还存在各式各样的杂波干扰信号,各种地物、云雨、海浪及敌人施放的金属丝干扰等杂波常常和目标信号相伴存在,提取相关参数,抑制杂波干扰成为首要问题。在抑制杂波中,如何有效的解“盲速”达到抑制杂波信号提高检测能力就成为一项核心任务,针对这一问题,给出了参差MTI滤波器的设计与实现方法。针对此,本论文开展了如下工作:首先介绍雷达杂波类型以及杂波特性,接着介绍杂波抑制常用方法,并给出了“盲速”问题的模型,然后介绍了几种解“盲速”的参差码优化算法,其中重点介绍了用遗传算法来完成参差码寻优的过程,利用寻优所得的参差码进行参差MTI设计,达到解“盲速”及杂波抑制的目的,在该算法下,通过不同条件进行滤波器设计,对单杂波及多杂波情况下进行杂波抑制和目标检测。并通过算法仿真,对所介绍方法进行了性能分析。最后结合某雷达信号处理系统硬件平台,介绍了雷达信号处理硬件平台的结构和组成,以及算法实现方案,给出了参差MTI中的AMTI滤波器在单杂波和多杂波情况下,实现对杂波抑制的方法。并重点介绍了系统中通讯控制器的软件设计及功能实现,最后通过硬件的平台搭建和硬件程序的调试,实现了参差MTI中的AMTI滤波器对单杂波和多杂波的抑制功能。
[Abstract]:With the development of society and the progress of science and technology, radar has a broad application prospect in military field and daily life. From the angle of war, our requirement for radar is to be able to deal with the target echo signal in time and effectively. In order to realize the real-time, effective search and tracking of mass moving targets, that is, to process the echo signal reasonably, to extract the target parameters that we need, and to suppress the clutter interference information that we do not need, so as to guide the artillery. Missiles and other weapons attack targets. Therefore, whether the radar system can play its due effect in the complex electromagnetic environment has become an urgent problem for military and civilian electronic equipment. Among the echo signals received by radar, in addition to the target signal, there are often all kinds of clutter jamming signals. Clutter such as various ground objects, clouds and rain, waves and metal wire interference from the enemy often accompany the target signal. The most important problem is to extract the relevant parameters and suppress clutter interference. In the suppression of clutter, how to solve the blind velocity effectively to improve the detection ability of clutter suppression signal becomes a core task. In view of this problem, the design and implementation method of staggered MTI filter is presented. In this paper, the following works are carried out: firstly, the types and characteristics of radar clutter are introduced, then the common methods of clutter suppression are introduced, and the model of "blind velocity" problem is given. Then, this paper introduces several optimization algorithms of staggered codes for "blind speed", in which genetic algorithm is used to complete the optimization of staggered codes, and the staggered MTI is designed by using the staggered codes obtained by optimization. To solve the problem of blind velocity and clutter suppression, the filter is designed under different conditions for clutter suppression and target detection in the case of single clutter and multiple clutter. And through the algorithm simulation, the performance of the introduced method is analyzed. Finally, combined with the hardware platform of a radar signal processing system, the structure and composition of radar signal processing hardware platform and the algorithm implementation scheme are introduced. The AMTI filter in staggered MTI is given in the case of single clutter and multiple clutter. The method of clutter suppression is realized. The software design and function realization of the communication controller in the system are emphatically introduced. Finally, the suppression function of AMTI filter in staggered MTI to single clutter and multi-clutter is realized through hardware platform construction and hardware program debugging.
【学位授予单位】:西安电子科技大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN957.51

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