基于环视SAR数据的雷达运动参数估计

发布时间：2018-03-13 22:45

本文选题：环扫SAR成像　切入点：线性距离—多普勒算法　出处：《南京航空航天大学》2014年硕士论文　论文类型：学位论文

【摘要】：环视合成孔径雷达主要用于在导弹精确末制导中进行景象匹配,而雷达的运动参数是实现精确制导的关键因素之一。雷达运动参数可以由GPS和IMU直接测得,也可以通过从实测数据中估计得出。由于环扫SAR雷达平台具有运动速度快、非匀速运动和大斜视等特点,因此对成像质量要求比较高。而现有GPS和IMU测得的雷达运动参数一般很难满足成像精度要求。本文研究基于雷达回波数据的运动参数估计方法,通过利用多普勒参数估计和图像匹配等技术对运动参数进行精确估计,以适应环扫SAR高分辨率成像和精确制导的要求。本文的主要思路如下:第一章绪论回顾了SAR的发展历史,介绍了国内外在SAR领域的发展情况,介绍本文研究内容“环扫SAR成像及环扫SAR参数估计”的背景并且简要说明本文的主要工作。第二章详细介绍一种经典的大斜视SAR成像算法,即线性距离-多普勒算法,这是本文环视SAR成像处理的基础。第三章提出了一种基于多普勒中心估计的雷达运动参数估计方法,并分析了该方法在不同条件下的参数估计性能。第四章提出了一种基于SAR图像匹配技术的雷达运动参数估计方法,并且对该方法进行了误差分析和性能评估。第五章结束语对全文的工作进行了总结,并指出了下一步需要继续研究的问题。
[Abstract]:The synthetic Aperture Radar (SAR) is mainly used for scene matching in missile precision terminal guidance, and the radar motion parameters are one of the key factors to achieve precision guidance. The radar motion parameters can be directly measured by GPS and IMU. It can also be estimated from the measured data. Because the SAR radar platform has the characteristics of fast motion, non-uniform motion and large squint, etc. Therefore, the imaging quality is very high. However, the existing radar motion parameters measured by GPS and IMU are difficult to meet the requirements of imaging accuracy. In this paper, a method for estimating radar motion parameters based on radar echo data is studied. By using Doppler parameter estimation and image matching techniques, the motion parameters are accurately estimated to meet the requirements of high-resolution imaging and precision guidance of ring-scan SAR. The main ideas of this paper are as follows: in Chapter one, the history of SAR is reviewed. This paper introduces the development of SAR at home and abroad, introduces the background of the research content of this paper, "ring scan SAR imaging and ring scan SAR parameter estimation", and briefly explains the main work of this paper. Chapter 2 introduces a classical large squint SAR imaging algorithm in detail. That is, linear range-Doppler algorithm, which is the basis of SAR imaging processing in this paper. In chapter 3, a method for estimating radar motion parameters based on Doppler center estimation is proposed. In chapter 4th, a radar motion parameter estimation method based on SAR image matching technique is proposed. The error analysis and performance evaluation of the method are also given. The conclusion of chapter 5th summarizes the work of the paper and points out the problems that need to be further studied in the next step.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.52

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