双/多基地合成孔径雷达前视三维分辨力研究及运动参数设计  

Capability Study of Three-Dimensional Forward-Looking Resolution and Motion Parameter Design for Bistatic/Multi-Static Synthetic Aperture Radar

作　　者：孟自强[1] 李亚超[1] 李浩林[1] 邢孟道[1] 保铮[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《西安交通大学学报》2014年第8期29-35,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(61001211;61303035);中央高校基本科研业务费专项资金资助项目(K5051202016)

摘　　要：为了准确获取高空高速双/多基地合成孔径雷达(B/M-SAR)目标回波的二维空变特性,建立了空间几何运动构型,借助梯度法和模糊函数理论,对B/M-SAR的前视三维成像能力和分辨特性进行了分析和研究,并基于分辨力的变化特性,设计了影响成像分辨力的主要运动参数。研究结果表明:B/M-SAR具有前视三维成像能力,成像场景存在最佳成像区域和发射机平台最佳飞行时段;多普勒分辨力和地距分辨力均具有二维空变性,目标纵坐标的增大会引起地距分辨能力增强,且在发射机旋转角度270°处达到最优;高度向分辨力不具有位置空变性,在接收机运行至目标区域正上方时分辨性能最佳;要达到1m的地距分辨力和2m的高度分辨力,应选择234.7MHz的发射信号带宽。A study is conducted on three-dimensional （3D） forward-looking imaging capability and resolution property of bistatic/multi-static synthetic aperture radar （B/M-SAR） in high-space and high-speed state to accurately obtain two-dimensional （2D） variance characteristics of target echo in this configuration.A geometric model is built,and the gradient method and the ambiguity function method are adopted in analysis and simulations.And main motion parameters that affect resolution significantly are designed.The analysis and simulation results show that B/M-SAR possesses the 3D forward-looking imaging capability and there exist the optimal resolution area in the imaging area and the optimal motion period of transmitter.Both the Doppler resolution and the range resolution have 2D variant,but the range resolution becomes better as the y-axis of target increases and reaches the best performance at the transmitter rotation angle of 270 °.Height resolution is invariant in location and performs the best as receiver moves on the right above of the target area.Transmitting signal bandwidth of 234.7 MHz should be chosen to obtain range resolution of 1 meters and height resolution of 2 meters.

关 键 词：合成孔径雷达 前视三维成像 分辨特性 参数设计 

分 类 号：TN957[电子电信—信号与信息处理]