Comparison of Digital Beamforming Techniques for Enhanced Ice Sounding Radar Data Processing
Comparison of Digital Beamforming Techniques for Enhanced Ice Sounding Radar Data Processing
复制标题
增强冰探雷达数据处理的数字波束形成技术比较
DOI：
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发表时间：
2014
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：
R. Scheiber;P. Prats;M. Nannini;Michelangelo Villano;K. Morrison;N. Gebert
来自高空的冰探测雷达会受到偏离天底的冰面反射（杂波）的影响，这种杂波会覆盖来自基岩和/或内部冰层的感兴趣的天底信号。多口径天线雷达系统被开发出来以减轻表面杂波的影响，从而能够对从各个空间分离的口径接收到的数据进行空间可变数字波束形成（DBF）处理。本文研究了四种不同的波束形成算法：常规波束控制、杂波角度置零、最优波束形成器和最小方差无失真响应（MVDR）波束形成器。基于机载冰探测场景的模拟进行了比较。此外，从P波段北极星（POLARIS）传感器获取的数据计算出了真实的回波图。就未来天基冰探测任务的实施得出了相关结论。
Ice sounding radar from high altitudes is compromised by off-nadir ice surface reflections (clutter), which overlays the nadir signal of interest originating from the bedrock and/or internal ice layers. Multi-aperture antenna radar systems were developed to mitigate the impact of surface clutter allowing spatially variant digital beamforming (DBF) processing of the data received from the individual spatially separated apertures. This paper investigates four different beamforming algorithms: conventional beamsteering, nulling of clutter angles, optimum beamformer and the MVDR beamformer. Comparisons are performed based on simulations for an airborne ice sounding scenarios. In addition, real echograms are computed from data acquired by the P-band POLARIS sensor. Relevant conclusions are drawn with respect to the implementation of a future space-based ice sounding mission.