机载SAR成像对瞄准线运动补偿的要求  

Airborne SAR Imaging Quantitative Requirement to Line of Sight Motion Compensation Errors

作　　者：曹福祥[1] 袁建平[1] 

机构地区：[1]西北工业大学

出　　处：《飞行力学》1999年第2期92-96,共5页Flight Dynamics

摘　　要：飞机偏离匀速直线运动的运动误差是机载合成孔径雷达（ＳｙｎｔｈｅｔｉｃＡｐｅｒｔｕｒｅＲａｄａｒ，ＳＡＲ）成像的基本困难之一。通过详细的理论推导，给出了当飞机沿瞄准线方向（即雷达天线相位中心至目标视线）同时存在恒定速度误差、恒定加速度误差和正弦摆动速度误差时，以回波信号压缩波形的主瓣偏移、二次相位误差、三次相位误差以及积分旁瓣比等ＳＡＲ系统图像质量指标的最大允许值表示的机载正侧视ＳＡＲ运动补偿定量要求的解析式。并结合一例子进行了计算分析。Synthetic aperture radar (SAR) relies on knowledge of the relative motion between the flight vehicle (strictly is antenna phase center) and the target.If the flight path of the flight vehicle is not accurately known or the SAR processor is limited in its ability to take the flight data into account,the SAR image will be degraded.This paper studies stripmap SAR motion compensation (SARMC) requirement to complicated line of sight motion errors of flight vehicle,derives analytical equations of SARMC quantitative requirement expressed as allowable maximum value of the mainlobe shift,quadratic phase error,cubic phase error and the integrated sidelobe ratio, and gives an calculating example.

关 键 词：合成孔径雷达 运动补偿 定量分析 机载 瞄准线 

分 类 号：V243.2[航空宇航科学与技术—飞行器设计] TN959.73[电子电信—信号与信息处理]