时频同步误差影响双基地SAR成像效果的仿真系统设计  

Design of a Simulation System for Evaluating the Influence of Time-Frequency Synchronization Error on the Imaging Effect of Bistatic SAR

作　　者：李沛洲 杨勇[1] 李术 班亚龙 常军[1] LI Peizhou;YANG Yong;LI Shu;BAN Yalong;CHANG Jun(Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]中国西南电子技术研究所,成都610036

出　　处：《电讯技术》2024年第11期1826-1835,共10页Telecommunication Engineering

摘　　要：以双基地合成孔径雷达(Synthetic Aperture Radar,SAR)协同探测和目标成像为背景,基于时频误差实测数据设计了一套机载双基SAR系统的时频同步误差建模和分析的仿真系统。系统由时频误差建模模块、成像几何构型设置模块、成像回波产生模块及成像效能评估模块组成。时频误差建模模块对实际采集的时频误差进行建模,成像几何构型设置模块进行典型机载双基SAR几何构型参数设置,成像回波产生模块利用二维频域快速傅里叶变换法(Two-dimension Fast Fourier Transform,2DFFT)生成原始回波信号,成像效能评估模块完成回波成像和成像效果在线定量评估。整个系统功能通过编写图形用户界面(Graphical User Interface,GUI)实现操作可视化。该仿真系统将实际时频误差数据模型与理论模型进行对比,定量分析特定几何构型下实际时频误差对双基SAR成像的影响。结果表明,该仿真系统能实时在线定量评估实际时频误差下的双基SAR成像效果,对工程项目研制具有指导意义。Taking the collaborative detection and target imaging as the background,the authors design a simulation system for modeling and analyzing the time-frequency synchronization error of an airborne bistatic synthetic aperture radar(SAR)system based on actual collected time-frequency error data.The system consists of a time-frequency error modeling module,an imaging geometry configuration setting module,an imaging echo generation module and an imaging efficiency evaluation module.The frequency time-error modeling module models the actual collected time-frequency errors,the imaging geometry configuration setting module sets typical airborne bistatic SAR geometry configuration parameters,the imaging echo generation module uses two-dimension fast fourier transform(2DFFT)method to generate the original echo signal,and the imaging effectiveness evaluation module completes echo imaging and evaluates the imaging effect online and quantitatively.The entire system function is visualized through a graphical user interface(GUI).This simulation system compares the actual time-frequency error data model with the theoretical model,and quantitatively analyzes the impact of actual time-frequency error on bistatic SAR imaging under specific geometric configuration.The results indicate that the simulation system can quantitatively evaluate the imaging effect of bistatic SAR under actual time-frequency errors in real time online and propose requirements for time-frequency errors based on imaging performance which requirements,has guiding significance for the development of engineering projects.

关 键 词：双基SAR 协同探测 时频同步 误差分析 

分 类 号：TN957[电子电信—信号与信息处理]