基于点目标的仿真与实验于全极化合成孔径雷达的极化校正研究
发布时间：2018-07-21 16:00
【摘要】：本文对有关全极化合成孔径雷达极化校正、极化分解以及极化特征参数提取进行了详细的阐释,从物理背景到应用的了解、探索和挖掘的过程中,取得了一些创新性的成果。主要研究内容和创新点包括:(1)从全极化合成孔径雷达的物理背景出发,系统性地阐释了电磁波的极化状态及其表征、目标极化散射特征的描述、极化合成、极化特征响应等全极化合成孔径雷达的基本理论;基于全极化合成孔径雷达系统发射和接收转换过程,建立了基于混合式角反射器法的极化校正模型,明晰了通道间隔离度不足、串扰、幅度与相位不平衡等失真影响以及极化校正中涉及的重要物理概念;(3)提出一种基于三个点目标的全极化合成孔径雷达极化校正的方法,该方法通过三面角反射器、二面角反射器以及旋转22.5°二面角反射器的三个点目标,依据目标实测与理论散射矩阵建立关系来获取校正矩阵,然后利用校正矩阵对全极化合成孔径雷达的回波数据进行校正,从而完成对全极化合成孔径雷达各极化通道之间的幅度与相位不平衡及串扰的校正。(4)基于仿真实验,验证了该极化校正方法的有效性和稳定性,探究旋转22.5°二面角反射器随旋转角度以及其摆设角度的敏感性对校正精度的回馈影响,为机载Pi-SAR系统的校正提供参考;(5)基于机载实验,以机载Pi-SAR系统获取的全极化SAR影像为例,运用所提出的极化校正方法,得出校正结果,进行定量分析,以角反射器的极化特征响应作为评价极化校正效果的可视化对比方式之一,将参考目标校正前、校正后与理想极化特征响应图进行对比;(6)极化分解作为极化SAR应用领域的重要分支之一,将校正前后的全极化SAR影像应用于Pauli分解和Yamaguchi四分量分解,并基于TSVM分解提取校正前后的三个极化特征参数,予以验证极化校正的效果。
[Abstract]:In this paper, the polarization correction, polarization decomposition and polarization characteristic parameter extraction of fully polarized synthetic aperture radar are explained in detail. Some innovative results have been obtained in the process of understanding, exploring and mining from physical background to application. The main research contents and innovations are as follows: (1) from the physical background of fully polarized synthetic aperture radar (ASAR), the polarization state and characterization of electromagnetic wave, the description of polarimetric scattering characteristics and polarization synthesis are systematically explained. The basic theory of polarimetric synthetic aperture radar (SAR), such as polarization characteristic response, and the polarization correction model based on the hybrid angular reflector method are established based on the transmission and reception conversion process of the full polarization synthetic aperture radar (ASAR) system. The effects of distortion, such as insufficient isolation between channels, crosstalk, amplitude and phase imbalance, and the important physical concepts involved in polarization correction are clarified. (3) A method of polarization correction for fully polarized synthetic aperture radar based on three point targets is proposed. The correction matrix is obtained from the three point targets of the trihedral reflector, the dihedral reflector and the rotating 22.5 掳dihedral reflector, based on the relation between the measured target and the theoretical scattering matrix. Then the full polarization synthetic aperture radar echo data is corrected by using the correction matrix to correct the amplitude and phase imbalance and crosstalk between the polarization channels of the full polarization synthetic aperture radar. (4) based on the simulation experiments, The validity and stability of the polarization correction method are verified, and the feedback effect of rotation 22.5 掳dihedral angle reflector with rotation angle and sensitivity of display angle on correction accuracy is investigated. It provides a reference for the correction of airborne Pi-SAR system. (5) based on the airborne experiments, taking the fully polarized SAR image obtained by the airborne Pi-SAR system as an example, using the proposed polarization correction method, the correction results are obtained and analyzed quantitatively. The polarization characteristic response of the angular reflector is used as one of the visual contrast methods to evaluate the effect of polarization correction. (6) polarization decomposition, as an important branch of polarimetric SAR applications, is applied to Pauli decomposition and Yamaguchi four-component decomposition. Three polarization characteristic parameters before and after correction are extracted based on TSVM to verify the effect of polarization correction.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P237
[Abstract]:In this paper, the polarization correction, polarization decomposition and polarization characteristic parameter extraction of fully polarized synthetic aperture radar are explained in detail. Some innovative results have been obtained in the process of understanding, exploring and mining from physical background to application. The main research contents and innovations are as follows: (1) from the physical background of fully polarized synthetic aperture radar (ASAR), the polarization state and characterization of electromagnetic wave, the description of polarimetric scattering characteristics and polarization synthesis are systematically explained. The basic theory of polarimetric synthetic aperture radar (SAR), such as polarization characteristic response, and the polarization correction model based on the hybrid angular reflector method are established based on the transmission and reception conversion process of the full polarization synthetic aperture radar (ASAR) system. The effects of distortion, such as insufficient isolation between channels, crosstalk, amplitude and phase imbalance, and the important physical concepts involved in polarization correction are clarified. (3) A method of polarization correction for fully polarized synthetic aperture radar based on three point targets is proposed. The correction matrix is obtained from the three point targets of the trihedral reflector, the dihedral reflector and the rotating 22.5 掳dihedral reflector, based on the relation between the measured target and the theoretical scattering matrix. Then the full polarization synthetic aperture radar echo data is corrected by using the correction matrix to correct the amplitude and phase imbalance and crosstalk between the polarization channels of the full polarization synthetic aperture radar. (4) based on the simulation experiments, The validity and stability of the polarization correction method are verified, and the feedback effect of rotation 22.5 掳dihedral angle reflector with rotation angle and sensitivity of display angle on correction accuracy is investigated. It provides a reference for the correction of airborne Pi-SAR system. (5) based on the airborne experiments, taking the fully polarized SAR image obtained by the airborne Pi-SAR system as an example, using the proposed polarization correction method, the correction results are obtained and analyzed quantitatively. The polarization characteristic response of the angular reflector is used as one of the visual contrast methods to evaluate the effect of polarization correction. (6) polarization decomposition, as an important branch of polarimetric SAR applications, is applied to Pauli decomposition and Yamaguchi four-component decomposition. Three polarization characteristic parameters before and after correction are extracted based on TSVM to verify the effect of polarization correction.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P237
【相似文献】
相关期刊论文 前10条
1 徐星欧;舒宁;李磊;;全极化雷达数据目标分解方法应用研究[J];测绘通报;2010年10期
2 金亚秋,曾亮;一层非均匀随机取向非球形粒子的全极化散射[J];电子学报;1992年09期
3 王新彪;李靖;姜景山;;相关型全极化辐射计研究[J];遥感技术与应用;2008年05期
4 王雪松;常宇亮;李永祯;戴幻尧;何密;肖顺平;;极化雷达的同时全极化测量与校准技术[J];科技导报;2011年26期
5 王勤诚;复合型铁氧体全极化器[J];宁波大学学报(理工版);2003年03期
6 李丽丽;马国庆;;全极化探地雷达采集系统及校准技术[J];地球物理学进展;2011年06期
7 陆浩;王振占;刘t熲，
本文编号：2136040
本文链接：https://www.wllwen.com/shoufeilunwen/benkebiyelunwen/2136040.html
