Interferometric discrimination of cross-track bed clutter in ice-penetrating radar sounding data
Interferometric discrimination of cross-track bed clutter in ice-penetrating radar sounding data
复制标题
穿冰雷达探测数据中跨道地床杂波的干涉判别
DOI：
10.1017/aog.2020.20
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发表时间：
2020
影响因子：
2.9
通讯作者：
D. Blankenship
中科院分区：
文献类型：
--
作者：
K. Scanlan;A. Rutishauser;D. Young;D. Blankenship
摘要冰川和冰盖雷达探测数据中的相关界面（即地表和河床）的解释是各种气候研究，特别是冰下水流路径模型中的主要边界条件。因此，有必要确保这些解释是一致的，不受跨跟踪杂波的影响。对于表面界面，干涉测量和一系列依赖于数字高程模型的方法已被用来成功地区分跨跟踪表面杂波。在这里，我们介绍了如何将干涉测量法应用于跨轨道河床地形的基底杂波问题。我们的方法是基于模糊的反射器，可能代表床杂波和反射器在相邻区域，出现不受基底杂波的差分相位的比较。相对于无歧义的床反射器产生最小干涉相位差的反射器被认为代表其一致的延续。我们成功地证明了我们的方法，使用60 MHz的中心频率马尔法数据收集的德文郡冰帽在加拿大北极。最后，我们调查的影响，杂波影响和干涉校正床解释冰层厚度估计，基底水头梯度和推断冰下水体的潜在范围。
Abstract The interpretations of relevant interfaces (i.e. the surface and bed) in radar sounding datasets over glaciers and ice sheets are primary boundary conditions in a variety of climate studies and particularly subglacial water routing models. It is therefore necessary to ensure these interpretations are consistent and not affected by cross-track clutter. For the surface interface, interferometry and a family of methods relying on digital elevation models have been used to successfully discriminate cross-track surface clutter. Here we present how interferometry can be applied to the problem of basal clutter from cross-track bed topography. Our approach is based on a comparison of the differential phases of ambiguous reflectors that may represent bed clutter and the differential phase of a reflector in an adjacent area that appears unaffected by basal clutter. The reflector yielding the smallest interferometric phase difference relative to the unambiguous bed reflector is considered to represent its consistent continuation. We successfully demonstrate our approach using 60 MHz center frequency MARFA data collected over Devon Ice Cap in the Canadian Arctic. Finally, we investigate the effects of clutter-affected and interferometry-corrected bed interpretations on ice layer thickness estimates, basal hydraulic head gradients and the potential extent of inferred subglacial water bodies.
影响因子：
1.6
作者：
Andrew Wright;M. Siegert
通讯作者：
Andrew Wright;M. Siegert