(英)基于太赫兹ISAR图像序列的空间目标抛物面天线载荷指向估计
投稿时间:2020-10-21  修订日期:2021-01-21  点此下载全文
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作者单位邮编
张野 国防科技大学电子科学学院 410073
杨潇 国防科技大学电子科学学院 
江新瑞 国防科技大学电子科学学院 
杨琪 国防科技大学电子科学学院 
邓彬 国防科技大学电子科学学院 410073
王宏强 国防科技大学电子科学学院 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);湖南省杰出青年基金
中文摘要:为了监视空间目标的工作状态,开展了基于多视角太赫兹逆合成孔径雷达(ISAR)图像序列的抛物面天线载荷指向估计研究。提出了一种空基太赫兹雷达成像体制,可以实现高轨卫星目标和小卫星目标的监视。由于圆形的抛物面天线边缘沿着任意观测平面的投影均为椭圆,提出了一种改进的随机霍夫变换方法,可以实现太赫兹ISAR图像中椭圆成分的自动检测和参数提取。为了确保指向估计算法的效率、精度和鲁棒性,提出了一种两层估计算法。首先估计抛物面天线边缘的三维圆心坐标和半径,将估计得到的参数作为先验信息,通过求解一个最小化椭圆短轴长度和椭圆倾角联合误差的最优化问题实现对天线载荷指向的估计。卫星模型的电磁散射数据证明了本文所提出的抛物面天线载荷指向估计方法的有效性。
中文关键词:姿态指向估计  抛物面天线载荷  空间目标  逆合成孔径雷达(ISAR)图像  空基太赫兹雷达  随机霍夫变换(RHT)  粒子群优化(PSO)
 
Attitude direction estimation of space target parabolic antenna loads using sequential terahertz ISAR images
Abstract:To monitor the working state of a space target, attitude direction estimation of parabolic antenna loads from a multi-view sequence of the terahertz (THz) inverse synthetic aperture radar (ISAR) images is developed. A space-based THz radar imaging system, which aims to achieve surveillance of high earth orbit satellite targets and small satellite targets, is proposed. Under the theorem that the projection of the parabolic antenna edge (a circle) along arbitrary observation direction is an ellipse, an improved Randomized Hough Transform is proposed to automatically detect and calculate the five key parameters of ellipse components from each THz ISAR image. To ensure the efficiency, accuracy, and robustness of the estimated attitude direction, a two-level estimation algorithm is proposed. The radius and three-dimensional center location of the antenna edge are estimated first. Then, taking these parameters as prior information, the attitude direction is estimated by solving an optimization to minimize the joint error about the length of semi-minor axis and the inclination angle of an ellipse. Electromagnetic scattering data of satellite model targets illustrate the effectiveness and robustness of the proposed method in attitude direction estimation of parabolic antenna loads.
keywords:attitude direction estimation, parabolic antenna load, space target, inverse synthetic aperture radar (ISAR) image, space-based terahertz radar, randomized Hough Transform (RHT), particle swarm optimization (PSO)
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