基于直线斜飞弹道的弹载SAR成像方案

A Missile-borne SAR Image Scheme Based on Linear Slant Trajectory

针对弹载SAR成像实时性高、非匀直弹道下成像算法、运动补偿困难,难以工程实现的现状,提出了一种末制导阶段在恒定高度采用直线斜飞弹道的SAR成像制导模式。详细分析了该模式的工作过程、极坐标格式SAR聚束成像算法及直线斜飞弹道对制导性能产生的影响。仿真结果表明,该模式在增加少量制导时间的代价下,借鉴机载聚束SAR成像算法即能获得高质量的SAR图像,为SAR末制导的工程化提供了有益借鉴。

For the difficulties in realizing synthetic aperture radar（SAR） terminal guidance, such as high real- time, imaging algorithms under non - uniform straight trajectory and motion compensation, a SAR terminal guid- ance mode is proposed, where the missile flies inca straight squint trajectory at constant hight. The working pro- cess polar format SAR spotlight imaging algorithm and effect of straight slant trajectory on guidance performance are analysed in detail. Simulation results show that this working mode can obtain high - resolution image refering to space spotlight SAR image algorithm in the price of adding little guidance time and it gives a meaningful refer- ence in realizing SAR terminal guidance.