摘要
针对弹载合成孔径雷达大斜视模式下飞行轨迹复杂、距离徙动严重及成像精度低的问题,提出了一种大斜视模式下弹载合成孔径雷达的成像方法。该方法基于回波信号距离走动大、距离弯曲小的特点,建立了弹载SAR大斜视加速运动模型,然后先通过时域去走动,再使用由级数反演得到的信号频谱分析式,在频域去除二维耦合,大大降低了距离向和方位向耦合程度,有效解决了弹载SAR大斜视角成像时聚焦性能降低的问题。仿真结果表明,该方法可满足弹载SAR大斜视角的成像要求。
A missile-bome high squint synthetic aperture radar imaging method was proposed for the problems of complicated flight track, range migration and lower imaging precision. According to the echo signal properties of larger range walk and smaller range cell curvature Firstly, an accelerated motion model of high squint missile-borne SAP, was established, and then removed the range walk in time-domain, reduced the coupling in 2-D frequency domain using an analytical form of the signal spectrum derived by the method of series reversion. The technique could reduced the range azimuth coupling and improve accurate focusing for the high squint missile-home SAR. Simulation results showed the proposed technique could be applied in the high squint missile-borne SAR.
出处
《探测与控制学报》
CSCD
北大核心
2014年第4期17-22,共6页
Journal of Detection & Control
基金
国家自然科学基金资助(61301216)
江苏省研究生创新基金资助(CXZZ130203)
关键词
合成孔径雷达
弹载
大斜视
级数反演
synthetic aperture radar （SAR）
missile-borne
high squint
series reversion
