舰船目标ISAR成像方法研究
发布时间：2018-10-13 17:31
【摘要】：舰船目标的逆合成孔径雷达(Inverse Synthetic Aperture Radar-ISAR)成像主要利用雷达与舰船目标的相对运动而形成二维图像,是当今海内外学者们研究热点之一,具有广泛的军事和民用价值,可以用于军事侦察,海面目标的识别与探测,海面船只的引导和海面上的技术支持等工作。舰船目标除了沿其航线方向的直线运动以外,受海浪的影响会产生不同方向的转动。而海面情况的复杂性,增加了获得高质量舰船目标ISAR的图像的难度。本文对舰船目标的ISAR成像的不同场景进行研究,主要内容如下:1、分析了两种最基本的相对运动方式:理想转动模型和直线运动模型。转动模型成像是ISAR成像的基础,直线运动可以通过适当的运动补偿转化为转动运动。2、分析了舰船目标运动的特点,完成了舰船目标三种主要的的转动(pitch,roll,yaw)形式的建模,研究了传统ISAR成像的R-D算法。并进行了仿真实验,实验结果表明了R-D成像算法可以得到比较高质量的沿径向运动和小转角下转动的舰船目标成像结果。3、分析了舰船目标平动对ISAR成像造成的模糊影响,并研究了距离对准算法和相位补偿。提出了改进的单特显点相位补偿算法,实验表明,相比多普勒中心追踪法和单特显点法,该方法有效的提高了ISAR成像的图像锐利程度和图像对比度。4、针对大转角的舰船目标,研究了时频分析理论以及基于时频分布的ISAR成像,该方法就是利用时频分布替代傅里叶变换来进行雷达成像。该方法可以获得更加清晰的目标图像。实验结果表明基于时频分布的舰船目标成像方法明显优于传统的R-D算法。
[Abstract]:The inverse synthetic Aperture Radar (Inverse Synthetic Aperture Radar-ISAR) imaging of ship targets mainly uses the relative motion of radar and ship targets to form two-dimensional images, which is one of the research hotspots at home and abroad, and has a wide range of military and civil value. It can be used in military reconnaissance, target identification and detection, ship guidance and technical support. In addition to the linear motion along the course of the ship, the ship will rotate in different directions under the influence of the waves. The complexity of sea surface makes it more difficult to obtain high quality ISAR images of ship targets. In this paper, different scenes of ship target ISAR imaging are studied. The main contents are as follows: 1. Two basic relative motion modes: ideal rotation model and linear motion model are analyzed. Rotational model imaging is the basis of ISAR imaging, and linear motion can be transformed into rotational motion by proper motion compensation. 2. The characteristics of ship target motion are analyzed, and the modeling of three main pitch,roll,yaw forms of ship target is completed. The R-D algorithm of traditional ISAR imaging is studied. The simulation results show that R-D imaging algorithm can obtain high quality imaging results of ship targets with radial motion and rotation at small rotation angles. 3. The fuzzy effect of ship target translation on ISAR imaging is analyzed. The range alignment algorithm and phase compensation are also studied. An improved single-point phase compensation algorithm is proposed. The experimental results show that compared with the Doppler centroid tracking method and the single explicit point method, this method can effectively improve the sharpness and contrast of the image of ISAR imaging, aiming at the ship target with large turning angle. The theory of time-frequency analysis and ISAR imaging based on time-frequency distribution are studied. The method is to use time-frequency distribution instead of Fourier transform for radar imaging. This method can get clearer target image. The experimental results show that the ship target imaging method based on time-frequency distribution is superior to the traditional R-D algorithm.
【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】：TN957.52
本文编号：2269393
[Abstract]:The inverse synthetic Aperture Radar (Inverse Synthetic Aperture Radar-ISAR) imaging of ship targets mainly uses the relative motion of radar and ship targets to form two-dimensional images, which is one of the research hotspots at home and abroad, and has a wide range of military and civil value. It can be used in military reconnaissance, target identification and detection, ship guidance and technical support. In addition to the linear motion along the course of the ship, the ship will rotate in different directions under the influence of the waves. The complexity of sea surface makes it more difficult to obtain high quality ISAR images of ship targets. In this paper, different scenes of ship target ISAR imaging are studied. The main contents are as follows: 1. Two basic relative motion modes: ideal rotation model and linear motion model are analyzed. Rotational model imaging is the basis of ISAR imaging, and linear motion can be transformed into rotational motion by proper motion compensation. 2. The characteristics of ship target motion are analyzed, and the modeling of three main pitch,roll,yaw forms of ship target is completed. The R-D algorithm of traditional ISAR imaging is studied. The simulation results show that R-D imaging algorithm can obtain high quality imaging results of ship targets with radial motion and rotation at small rotation angles. 3. The fuzzy effect of ship target translation on ISAR imaging is analyzed. The range alignment algorithm and phase compensation are also studied. An improved single-point phase compensation algorithm is proposed. The experimental results show that compared with the Doppler centroid tracking method and the single explicit point method, this method can effectively improve the sharpness and contrast of the image of ISAR imaging, aiming at the ship target with large turning angle. The theory of time-frequency analysis and ISAR imaging based on time-frequency distribution are studied. The method is to use time-frequency distribution instead of Fourier transform for radar imaging. This method can get clearer target image. The experimental results show that the ship target imaging method based on time-frequency distribution is superior to the traditional R-D algorithm.
【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】：TN957.52
【参考文献】
相关期刊论文 前1条
1 保铮,邓文彪,杨军;ISAR成像处理中的一种运动补偿方法[J];电子学报;1992年06期
，本文编号：2269393
本文链接：https://www.wllwen.com/kejilunwen/wltx/2269393.html
