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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Direction-of-Arrival Estimation for Radar Ice Sounding Surface Clutter Suppression
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Direction-of-Arrival Estimation for Radar Ice Sounding Surface Clutter Suppression

机译：雷达冰探测面杂波抑制的到达方向估计

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摘要

Ice sounding radars are able to measure ice sheets by profiling their glaciological features from the surface to the bedrock. The current airborne and, in particular, future space-based systems are suffering from off-nadir surface clutter, which can mask the depth signal of interest. The most recent surface clutter suppression techniques are based on multi-phase-center systems combined with sophisticated coherent postprocessing. The performance of the techniques can be improved by accurate direction-of-arrival (DOA) estimates of the surface clutter. This paper deals with data-driven DOA estimation for surface clutter signals, which includes a formulation of the mathematical foundation of spatial aliasing. DOA estimation is applied to data acquired with the P-band POLarimetric Airborne Radar Ice Sounder at the Jutulstraumen Glacier, Antarctica. The effects of spatial aliasing related to a large phase center spacing are analyzed, and an unwrapping procedure is presented and applied to the data. Finally, DOA estimation of full-scene data is analyzed and used to show an along-track and incidence (off-nadir) angle dependent variation of the effective scattering center of the surface return, which is caused by a varying penetration depth.
机译：测冰雷达能够通过分析其从地表到基岩的冰川特征来测量冰盖。当前的机载系统，尤其是未来的天基系统，正处于离天底的地面混乱状态，这可能掩盖了感兴趣的深度信号。最新的表面杂波抑制技术基于多相中心系统以及复杂的相干后处理。可以通过表面杂波的精确到达方向（DOA）估计来提高技术的性能。本文涉及表面杂波信号的数据驱动DOA估计，其中包括空间混叠的数学基础的表述。 DOA估计适用于在南极洲Jutulstraumen冰川的P波段POLarimetric机载雷达测冰仪获取的数据。分析了与大相位中心间距有关的空间混叠的影响，提出了展开过程并将其应用于数据。最后，分析了全场景数据的DOA估计值，并使用它显示了表面回波有效散射中心的沿轨迹和入射角（偏离最低点）的变化，这是由穿透深度的变化引起的。

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