三维转动下旋转对称目标的转角估计方法  

Rotation Angle Estimation of Rotational Symmetric Target with Three-Dimensional Rotating Based on the Rotation Matching Feature

作　　者：王超[1] 叶春茂[1] 文树梁[1] WANG Chao;YE Chun-mao;WEN Shu-liang(Beijing Institute of Radio Measurement,Beijing 100854,China)

机构地区：[1]北京无线电测量研究所

出　　处：《现代防御技术》2019年第5期93-98,119,共7页Modern Defence Technology

摘　　要：转角估计是逆合成孔径雷达成像中的基本问题,得到的横向定标后图像可实现目标真实外形和尺寸等特征的提取,并为目标的参数估计和分类识别提供基础。针对三维转动的旋转对称目标,由于其转角变化的高度非线性,提出了一种基于旋转匹配特性的转角估计方法。基于旋转对称目标的三维转动模型,首先对目标在径向距离-速度差平面上的旋转匹配关系进行了证明和分析。进而,基于最优化准则,在雷达视线角二阶多项式近似下完成转角估计。仿真实验以进动锥柱体为例,在一个进动周期上对等效转速进行估计,结果表明算法在几乎所有的成像时刻都能有效估计目标转角。同时,实验还分析了散射点个数对转角估计性能的影响。Rotation angle estimation is a basic issue in inverse synthetic aperture radar (ISAR) imaging.The cross scaled ISAR images can be used to extract the real shape and size of the target and provide a foundation for parameter estimation and target recognition.For the rotational symmetric target with three-dimensional rotating,a rotation angle estimation algorithm has been proposed based on the rotation matching feature,on account of the highly nonlinear variation rotation angle.Based on the three-dimensional rotation model of the rotational symmetric target,the rotation matching feature on the radial range-velocity difference plane is firstly proved and analyzed.Then,the rotation angle is estimated under the optimization criterion and the second-order polynomial assumption of the radar sight angle.In the simulation,the equivalent rotation velocity of the three-dimensional rotating is estimated on a whole period,which takes the precession conical cylinder for example.The result illustrates that the algorithm proposed can efficiently estimate the rotation angle at almost every imaging time.And the influence of the number of scattering points on the estimation performance is also analyzed.

关 键 词：转角估计 图像旋转匹配 旋转对称目标 三维转动 进动 锥柱体 

分 类 号：TN95[电子电信—信号与信息处理] TN911.73[电子电信—信息与通信工程]