High resolution processing of hybrid strip-map/spotlight mode SAR
High resolution processing of hybrid strip-map/spotlight mode SAR
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DOI：
10.1049/ip-rsn:19960790
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发表时间：
1996-12-01
期刊：
影响因子：
--
通讯作者：
Baker, CJ
中科院分区：
文献类型：
--
作者：
Belcher, DP;Baker, CJ
传统的合成孔径雷达要么工作在覆盖范围有限的聚光灯模式下，要么工作在分辨率有限的条形图模式下。结果表明，通过使雷达天线离雷达远一点，而不是成像区域的中心，可以实现在条形图和聚光灯模式之间的照明时间，从而产生与传统聚光灯模式不同的分辨率和光斑大小组合。该模式的理论基础是由第一原理推导出来的，并表明条形图和聚光灯模式是限制情况。提出了一种正确补偿距离曲率的波数域处理方法及其与距离多普勒处理的等价性。该技术产生聚焦图像，并应用于模拟和真实数据。该模式的优点是在高分辨率下降低数据速率，使用更高增益的天线，并且在比聚光模式更大的区域上实现高分辨率。该技术可应用于空间和机载雷达，其中高分辨率和广域覆盖的结合是很重要的。
Synthetic aperture radars have traditionally operated in either the spotlight model in which the coverage is limited, or in the strip-map mode, in which the resolution is limited. It is shown that, by steering the radar antenna about a point further away from the radar than the centre of the area being imaged, illumination times between that of strip-map and spotlight mode are achieved, thus resulting in different combinations of resolutions and spot sizes than is the case for traditional spotlight mode, The theory underlying this mode is derived from first principles, and it is shown that strip-map and spotlight modes are limiting cases. A wavenumber domain processing technique is presented that correctly compensates for range curvature and its equivalence to range Doppler processing described mathematically. This technique results in focused images and is applied to both simulated and real data, The advantages of this mode are a reduced data rate at high resolution, the use of a higher gain antenna, and achieving high resolution over an area larger than that possible in the spotlight mode. This technique may be applied to both space and airborne radar where a combination of high resolution and wide area coverage is important.