High Resolution Wide Swath SAR Imaging with Digital Beamforming - Performance Analysis, Optimization, System Design
High Resolution Wide Swath SAR Imaging with Digital Beamforming - Performance Analysis, Optimization, System Design
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发表时间：
2006-05
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通讯作者：
N. Gebert;G. Krieger;A. Moreira
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作者：
N. Gebert;G. Krieger;A. Moreira
多孔径合成孔径雷达（SAR）系统结合对单个孔径信号进行适当的相干处理，可实现高分辨率宽条（HRWS） SAR成像。提出了一种创新的接收时数字波束形成重建算法，即使在方位角上采样数据阵列不均匀的情况下也能实现HRWS。本文将比较该算法与不同方位处理策略在总体采样依赖性方面的性能。进一步，对该算法进行了混叠和残余歧义的理论表征。在这种情况下，讨论了优化策略，以最大限度地提高系统的性能，通过模式渐窄的发送和“预波束整形的接收”网络，自适应调整虚拟采样的位置。
Multi-aperture synthetic aperture radar (SAR) systems in combination with an appropriate coherent processing of the individual aperture signals enable high resolution wide swath (HRWS) SAR imaging. An innovative reconstruction algorithm for such a digital beamforming on receive was presented that allows for HRWS even in case of a non-uniformly sampled data array in azimuth. This paper will compare this algorithm to different azimuth processing strategies regarding their performance in dependency of the overall sampling. Further, the algorithm is characterized theoretically regarding aliasing and residual ambiguities. In this context, optimization strategies are discussed to maximize the system’s performance by pattern tapering on transmit and “Pre-Beamshaping on Receive” networks that adaptively adjust the virtual sample positions.