基于方位向波束扫描的宽测绘带SAR方法研究

宽测绘带合成孔径雷达(SAR)是目前SAR研究的一个热点问题，在需要全球动态观察或高重复周期观察局部地区的应用中都希望能进行宽测绘带成像。在宽测绘带SAR方法中的关键问题是如何在混叠的信号中提取出各个子测绘带的回波，在现有的宽测绘带SAR方法中多数是基于距离向多波束、距离向脉冲编码、距离向自适应聚焦等方法区分各个子测绘带的回波。文中提出了一种基于方位向波束扫描的宽测绘带方法，可以在方位向频谱上区分各个子测绘带的回波，从而在保持SAR分辨率的情况下扩展测绘带。

A New Wide Swath SAR Method Basing on Azimuth Beam Scanning

Wide swath SAR is a hotspot of the research of SAR (Synthetic Aperture Radar). In many fields of SAR application which require global and dynamic surveillance or frequent surveillance of a certain part of the earth surface, the swath of SAR is expected to be much more wider. How to distinguish the return signal of every sub-swath from the mixed return signal is a very important problem in the wide swath methods. Most of the wide swath SAR method is based on multi-beam, pulse coding, or self-adapting focus. In this paper a new wide swath SAR method basing on beam scanning in the azimuth is present. This method can distinguish the return signal of every sub-swath from the mixed return signal in the azimuth frequency spectrum, and maintain the resolution.