GEO SAR照射的机载前视接收双基SAR系统二维分辨能力分析  

Two-dimensional Resolution Analysis of Airborne Forward-looking Receiving Bistatic SAR System with GEO SAR Illumination

作　　者：张滈铧 左伟华 刘波[1] ZHANG Haohua;ZUO Weihua;LIU Bo(China Academy of Space Technology(Xi'an),Xi'an 710199,China)

机构地区：[1]中国空间技术研究院西安分院,西安710199

出　　处：《电讯技术》2023年第1期47-55,共9页Telecommunication Engineering

摘　　要：地球同步轨道(Geostationary Earth Orbit,GEO)星/机双基前视合成孔径雷达(Synthetic Aperture Radar,SAR)实现了接收机飞行方向的成像能力,可以对重点区域进行持续前视观测,具有广泛的应用场景。对固定轨道GEO SAR照射下的机载前视接收机的双基SAR系统二维分辨能力进行了解析和验证仿真分析。首先,基于梯度法给出了GEO星/机双基前视SAR的二维分辨能力及其夹角的解析结果;其次,分析了不同双基前视构型对距离向分辨率、方位向分辨率和分辨率夹角的影响,并给出了基于分析结果的构型设计基本准则;最后,对GEO SAR处于不同轨道位置时分别进行了点目标仿真,有效验证了该分析方法的有效性和准确性。Geostationary earth orbit(GEO)spaceborne-airborne bistatic forward-looking synthetic aperture radar(SAR)can provide the receiver with imaging capabilities in flight direction,which can be utilized to obtain continuous forward observation of key areas and has a wide range of possible application scenarios.In this paper,the two-dimensional resolving power of the bistatic SAR,which comprises the airborne forward-look receiver and GEO illuminator,is analyzed and validated by simulation.First,the gradient method is applied to obtain the analytical results of the two-dimensional resolution capability and the angle between two-dimensional directions.Then,the influence of configuration on range resolution,azimuth resolution,and resolution angle is analyzed respectively,and the basic guidelines for configuration design are given according to the analysis results.Finally,point target imaging simulations are carried out when GEO SAR is in different orbital positions.Good agreement between the simulation results and the ones derived by the gradient method is achieved.

关 键 词：地球同步轨道(GEO) 星/机双基前视合成孔径雷达(SAR) 梯度法 二维分辨率 

分 类 号：TN958[电子电信—信号与信息处理]