【作者】 吴勇；

【导师】 郭桂蓉；

【作者基本信息】 国防科学技术大学 ， 信息与通信工程， 2005， 硕士

【摘要】 本文首先阐述了双站逆合成孔径雷达的概念、优点和发展历程,然后研究了双站逆合成孔径雷达的特例——单站逆合成孔径雷达对转台目标的二维成像算法,并在此基础上分析了四种主要的转台成像算法,FFT算法、滤波逆投影算法、谱外推算法和ESPRIT算法,并对以上各种算法分别在小角度和大角度下的成像性能进行了比较。在单站的基础上主要从原理方面研究了双站逆合成孔径雷达对转台目标的二维成像,分析了双站小角度旋转目标成像,推导出了横向分辨力和纵向分辨力的表达式,然后给出了仿真实验和结论。针对目标的运动对双站逆合成孔径雷达成像质量的影响,运用基于散射重心跟踪的ISAR运动补偿方法来消除目标运动对成像质量的影响,并针对双站ISAR运动目标回波获取的困难,运用一种用转台数据模拟运动目标回波的方法来获得仿真数据,最后用仿真数据验证了基于散射重心跟踪法的双站ISAR运动补偿的正确性。更多还原

【Abstract】 The concept, advantages and history of bistatic ISAR are introduced first in this paper, then 2-D turntable imaging of monostatic ISAR the special example of bistatic ISAR is studied. On the basis of monostatic ISAR four imaging algorithms are analyzed, including FFT algorithm, filtered backprojection algorithm, spectrum extrapolation algorithm and ESPRIT algorithm, and compared in the small and big angel of imaging. On the basis of monostatic imaging the 2-D turntable imaging principle of bistatic ISAR is studied,. the small rotational angel imaging is discussed and the resolution of cross-range and range are formulized. Then the simulation results and conclusion are given. For the effect of motion of target, a method of ISAR motion compensation based on scattering center tracking is used. For the difficulty of getting echo signal of bistatic ISAR of moving target, a method of simulating moving target using turntable data is used. Finally the imaging results by using simulating data based on scattering center tracking show the effectiveness of the methods.更多还原