全极化雷达前视成像方法研究

发布时间：2018-01-31 23:53

本文关键词： 全极化雷达前视成像极化测量多普勒锐化全极化阵列　出处：《国防科学技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：雷达前视成像理论与技术是当前雷达领域中亟需突破的难点问题之一,在精确制导、战场侦察等领域有着广阔的应用前景。将全极化技术与高分辨成像技术相结合,使雷达具备更高维度、更高精度的电磁信息测量能力和更强的复杂工作环境适应能力,也是当前国际上的研究热点。目前,将全极化技术引入雷达前视成像领域的研究还鲜有报道。论文以此为切入点,将极化与雷达前视成像技术相结合,针对典型的全极化前视雷达系统,研究相关的全极化前视成像算法。论文的具体工作包括:首先,介绍了四种典型的、相对成熟的前视成像算法,基于各自的成像原理分析了各算法性能的优势和不足,并给出了综合对比结果,为开展全极化前视成像算法的研究奠定基础。其次,针对斜前视区域成像,介绍了全极化雷达斜前视成像系统组成,建立了基于分时极化测量体制的全极化前视成像回波模型,研究了全极化斜前视DBS成像算法,结合各个极化通道回波信号的多普勒变化规律给出了成像算法的具体流程和成像参数的选择方法,并对该算法进行了仿真实验及结果分析,验证了该算法的有效性。最后,针对正前视区域成像,介绍了基于“收发分置”的全极化阵列前视成像雷达系统组成和工作方式,结合分时极化测量体制,建立了全极化阵列前视成像回波模型,研究了基于Chirp Scaling算法的全极化阵列前视成像方法,给出了该方法的具体流程及补偿因子,结合典型的雷达系统参数和仿真场景进行仿真实验,验证了全极化阵列Chirp Scaling前视成像方法的有效性。利用各极化通道的线性融合成像结果进行了目标检测仿真分析,结果表明利用全极化信息可以有效地改善前视雷达系统的目标检测性能。
[Abstract]:The theory and technology of radar forward imaging is one of the most difficult problems in the field of radar. Battlefield reconnaissance and other fields have a broad application prospects. Combining full polarization technology with high resolution imaging technology, radar has a higher dimension. The ability of measuring electromagnetic information with higher precision and the ability of adapting to complex working environment are also the current research hotspot in the world. There are few reports on introducing full polarization technology into the field of radar foresight imaging. In this paper, we combine polarization with radar forward imaging technology, aiming at typical fully polarized forward looking radar systems. The main work of this paper is as follows: firstly, four typical and relatively mature forward imaging algorithms are introduced. Based on their imaging principles, the advantages and disadvantages of each algorithm are analyzed, and the comprehensive comparison results are given, which will lay a foundation for the research of full polarization forward imaging algorithm. Secondly, for oblique forward region imaging. This paper introduces the composition of full polarization radar oblique forward imaging system, establishes a full polarization forward imaging echo model based on time-sharing polarization measurement system, and studies the full polarization oblique forward DBS imaging algorithm. Combining the Doppler variation rule of the echo signal of each polarization channel, the specific flow of the imaging algorithm and the method of choosing the imaging parameters are given, and the simulation experiment and the result analysis of the algorithm are carried out. The validity of the algorithm is verified. Finally, the structure and working mode of full polarization array forward imaging radar system based on transceiver and transceiver are introduced, combined with time-sharing polarization measurement system. The full polarization array forward imaging echo model is established, and the full polarization array forward imaging method based on Chirp Scaling algorithm is studied. The specific flow chart and compensation factor of the method are given. Combined with typical radar system parameters and simulation scenes to carry out simulation experiments. The validity of the full polarization array Chirp Scaling forward imaging method is verified. The target detection simulation analysis is carried out by using the linear fusion imaging results of each polarization channel. The results show that the target detection performance of the forward looking radar system can be improved effectively by using the full polarization information.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.52

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