摘要
前视合成孔径雷达(Synthetic Aperture Radar,SAR)在舰船成像方面展现出了巨大潜力,特别是在SAR导引头的应用上,弹载雷达通常在末制导阶段要求雷达正对着舰船运动,以实现精准打击。针对前视条件下传统SAR成像方法所面临的挑战,本文提出了一种基于极坐标格式算法(Polar Format Algorithm,PFA)的前视SAR舰船目标立面成像方法。该方法巧妙利用了舰船的三维特性,即使雷达工作在前视模式下,虽然在方位向上无法有效分辨目标,但在俯仰向上仍然存在多普勒频率的变化,因此可以在距离向和俯仰向上实现对舰船的二维高分辨率成像。此外,这种成像方法能够提供更为直观的舰船立面图像,这对于识别舰船类型、判断潜在威胁以及对其进行精准打击具有重大意义。最后,通过仿真实验对该方法进行了验证,利用PFA获得了清晰的舰船立面图像。
Forward-looking synthetic aperture radar(SAR)has shown great potential in ship imaging,especially in the application of SAR seeker.During the terminal guidance phase,missile-borne radar is usually required to face the ship directly to achieve precise strike.Aiming at the challenges faced by traditional SAR imaging method under forward-looking condition,this paper proposes a forward-looking SAR ship target facade imaging method based on polar format algorithm(PFA).This method cleverly utilizes the three-dimensional characteristics of the ship.Even if the radar oper-ates in the forward-looking mode,although the target cannot be effectively distinguished in the azimuth direction,there is still a change in Doppler frequency in the pitch direction.Therefore,the two-dimensional high-resolution imaging of the ship can be realized in the range and pitch directions.Moreover,this method can provide more intuitive facade images of the ship,which is of great significance for identifying ship types,assessing potential threats,and carrying out precise strikes.Finally,the method is verified through simulation experiments,and clear ship facade images are obtained by using PFA.
作者
刘峻楠
刘钟毓
张亦宁
毛新华
LIU Junnan;LIU Zhongyu;ZHANG Yining;MAO Xinhua(Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education,College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《雷达科学与技术》
北大核心
2025年第4期355-366,386,共13页
Radar Science and Technology
基金
国家自然科学基金(No.62471227)
天元国家级实验室基金(No.24-JSKY-ZZKT-28)。
关键词
合成孔径雷达
前视成像
舰船目标
极坐标格式算法
立面图像
synthetic aperture radar
forward-looking imaging
ship target
polar format algorithm
facade image
