高速机动平台SAR成像PRF设计方法  

PRF Design Method for SAR Imaging of High⁃Speed Maneuvering Platform

作　　者：杨琳 朱国辉 汪洋[1] 胡虹 YANG Lin;ZHU Guohui;WANG Yang;HU Hong(Key Laboratory of Aperture Array and Space Application,the 38th Research Institute of China Electronics Technology Group Corporation,Hefei 230088,China)

机构地区：[1]中国电子科技集团公司第三十八研究所孔径阵列与空间探测安徽省实验室,安徽合肥230088

出　　处：《雷达科学与技术》2024年第5期524-531,共8页Radar Science and Technology

基　　金：陆装预研基金(No.30105030203)。

摘　　要：在高速机动平台合成孔径雷达(Synthetic Aperture Radar,SAR)成像系统中,现有脉冲重复频率(Pulse Repetition Frequency,PRF)设计方法基于方位向信号带宽计算出的下限值过高,且忽视了雷达的工作占空比因素。针对上述问题,首先推导了一组避开发射脉冲干扰、平台正下方回波干扰以及距离向模糊等因素的关联PRF和雷达工作占空比的约束方程,然后提出了一种距离向分段SAR成像处理情况下的PRF下限值设计方法。仿真结果表明,在机动平台高速运动大前斜视聚束SAR成像时所提方法能够得到较小的PRF下限值,有效扩展了PRF可选择的范围,可以更好地满足实际工程应用。In the synthetic aperture radar(SAR)imaging system of high⁃speed maneuvering platform,the existing design methods of pulse repetition frequency(PRF)have some shortcomings including that the lower bound for the PRF calculated based on the azimuth signal bandwidth is too high,and the factor of radar’s duty ratio is neglected.In view of the above problems,firstly,a set of constraint equations that related to PRF and duty ratio are derived to avoid the fac⁃tors such as transmitting pulse interference,echo interference directly below the platform and range ambiguity.Then,a new design method for the lower bound of PRF in the case of range sectioned SAR imaging is proposed.The simulation results show that the proposed method can achieve a smaller PRF lower limit when highly squinted spotlight SAR imag⁃ing seeker moves at a high speed,which effectively expands the range of PRF selection and can better meet the need of practical engineering applications.

关 键 词：机动平台 合成孔径雷达 脉冲重复频率 距离模糊 方位模糊 

分 类 号：TN957[电子电信—信号与信息处理]