旋转上升合成孔径雷达三维成像算法  

Three-dimensional imaging algorithm for spiral synthetic aperture radar

作　　者：杨科[1] 廖桂生[1] 徐青[1] 王威[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,陕西西安710071

出　　处：《系统工程与电子技术》2014年第1期43-50,共8页Systems Engineering and Electronics

基　　金：国家重点基础研究发展计划(973计划)(2011CB707001);国家自然科学基金(61101242);中央高校基本科研业务费专项资金(K50511020009)资助课题

摘　　要：针对复杂低空环境三维场景探测需求,建立了旋转上升合成孔径雷达成像模型,并提出了相应的成像算法。该模型通过距离向发射调频信号、方位向和高度向形成二维合成孔径,从而具有距离向-方位向-高度向三维分辨能力。相应的成像算法分为空间位置校正和"一步一悬停"模式下omega-k成像算法两大部分,通过方位向和高度向偏移补偿,可将复杂的"旋转上升"模式简化为高度向"一步一悬停"模式,然后通过改进的omega-k成像算法实现三维成像。最后,仿真结果验证了该算法的有效性。To meet the demand of the three-dimensional imaging of the complex environment in low-altitude space area, the model of spiral synthetic aperture radar （SSAR） is established and the corresponding algorithm is proposed. This model has the three-dimensional resolution capability through a means of transmitting frequency-modulated signals in the range direction and forming two synthetic apertures in the azimuth direction and elevation direction. The SSAR imaging algorithm consists of the spatial offset correction and the extended ome ga-k algorithm. The complex ＂spiral＂ mode is simplified into the ＂hover-to-go＂ mode by the spatial offset eor rection in the azimuth direction and elevation direction, and then the three-dimensional imaging in the ＂hover-to- go＂ mode is implemented by the extended omega-k algorithm. Finally, the effectiveness of the proposed algo- rithm is validated through simulation results.

关 键 词：旋转上升合成孔径雷达 三维成像 空间位置校正 omega-k算法 

分 类 号：TN957.52[电子电信—信号与信息处理]