一种基于子孔径的GMTI方法
doi: 10.3724/SP.J.1146.2005.00766
A Novel GMTI Method Based on Subaperture
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摘要: 该文研究了一种基于子孔径分割的GMTI(Ground Moving Target Indication)方法。在该方法中将天线孔径沿方位向对称分割为两个子孔径。当天线波束在空间扫描时，两个子孔径先后扫过目标所在区域。由于两个子孔径之间有二分之一合成孔径时间的时间差，动目标在前后两个孔径中运动状态发生改变，而静止目标的运动状态不变。因此，可以通过比较目标在两个子孔径中运动状态的差异发现动目标，并根据目标轨迹判断其运动参数。为了避免方位压缩造成的动目标模糊或动目标能量损失，同时为保留目标运动轨迹，这里不进行方位压缩处理。与多通道GMTI方法相比较，此方法具有只需一副单通道天线，处理方法简单，运算量小，可与合成孔径雷达工作模式兼容等诸多优势。
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关键词:
- 合成孔径雷达;动目标;GMTI;子孔径
Abstract: A novel approach of Ground Moving Target Indication (GMTI) based on subaperture is proposed in this paper. In this approach, the aperture of an antenna is divided into two subapertures. When the radar is in operation, the two subapertures pass the same ground patch in tandem with an interval of half of synthetic aperture time. During this interval, the position of a stationary target keeps unchanged, but that of a moving one is altered. Then, the moving target is detected by comparing images derived from the two subapertures, and its motion parameters can be estimated with its trajectory. In order to avoid the moving target being smeared and preserve its trajectory, azimuth focusing process is omitted. Compared with present GMTI approaches, the new one has many advantages, only single channel antenna, low cost, less computation load, compatible with SAR mode, etc. -
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