Multi-Channel Azimuth Processing for High-Resolution Wide-Swath SAR Imaging
Multi-Channel Azimuth Processing for High-Resolution Wide-Swath SAR Imaging
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DOI：
10.5445/ir/1000015636
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
N. Gebert
中科院分区：
文献类型：
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作者：
N. Gebert
传统的合成孔径雷达（SAR）系统只有一个发射和接收天线，无法同时对宽测绘带进行高空间分辨率成像。本工作研究了采用多个接收孔径来克服这种系统固有限制的新技术，特别强调方位角的多个通道。该工作介绍了一种创新的处理算法，适合于应付多通道数据。全面分析这种新的“多通道重建算法”涵盖了其对系统性能的影响的理论研究，以及它的验证与测量和模拟数据。仿真结果的背景下，一个完整的高分辨率宽测绘带SAR系统的设计，突出了复杂的系统架构和多通道处理之间的关系。随后，不同的创新优化策略，以改善系统的性能和增加操作的灵活性进行了演示和理论分析扩展到这些方法。此外，多通道系统在突发模式下，如TOPS（地形观测与渐进扫描）和ScanSAR的研究作为一种解决方案，新的成像模式，使紧凑的天线尺寸的一个前所未有的组合超宽测绘带合理的几何分辨率在方位角。
Conventional Synthetic Aperture Radar (SAR) systems with a single transmit and receive antenna are not capable of simultaneously imaging a wide swath with high spatial resolution. New techniques employing multiple receive apertures to overcome this system-inherent limitation are examined in this work, with particular emphasis on multiple channels in azimuth. The work introduces an innovative processing algorithm that is suited to cope with the multi-channel data. Comprehensive analysis of this novel “multi-channel reconstruction algorithm” covers the theoretical investigation of its impact on system performance as well as its verification with measured and simulated data. The simulation results are given in the context of a complete high-resolution wide-swath SAR system design which highlights the intricate relationship between system architecture and multi-channel processing. Subsequently, different innovative optimization strategies to improve the system performance and increase the operational flexibility are demonstrated and theoretical analysis is extended to these approaches. Furthermore, multi-channel systems operating in burst modes such as TOPS (Terrain Observation with Progressive Scan) and ScanSAR are investigated as a solution to new imaging modes enabling for compact antenna dimensions an unprecedented combination of an ultra-wide swath with reasonable geometric resolution in azimuth.