弹载SAR宽域成像的扫描参数设计

Design of Beam Scanning Parameter for Missile-borne SAR Wide-Area Imaging

针对弹载条带合成孔径雷达(SAR)在末制导阶段由于波束覆盖范围窄和成像时间短,不易获得所要求的大面积图像的问题,提出了一种新的波束扫描方案,并根据导弹在末制导阶段的飞行特点,结合子孔径处理方法,对波束扫描参数进行了理论分析和设计。仿真结果表明,与条带SAR相比,该扫描SAR能有效地在较短的数据录取时间内获得大面积的SAR图像。

It is difficult for missile-bome stripmap SAR to gain the required wide-spread image in the terminal guidance because of narrow beam coverage and short imaging time. To solve the problem, a new scheme of beam scanning is proposed. And beam scanning parameter is theoretically analysed and designed, according to the flight features of missile in the terminal guidance and combined with subaperture processing. The simulation re- sult shows that the proposed scan SAR can effectively gain wide-spread image in the short time of rawdata- recording, compared with stripmap SAR.