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.

中文翻译：

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穿冰雷达探测数据中跨道床杂波的干涉鉴别

冰川和冰盖上的雷达探测数据集中相关界面（即表面和床层）的解释是各种气候研究，尤其是冰下水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，并且不受交叉轨道杂波的影响。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于成功区分跨轨道表面杂波。在这里，我们介绍了如何将干涉测量法应用于交叉轨道床地形的基础杂波问题。我们的方法是基于对可能代表床杂波的模糊反射器的差分相位和相邻区域中似乎不受基础杂波影响的反射器的差分相位的比较。相对于明确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。我们使用在加拿大北极德文冰盖上收集的 60 MHz 中心频率 MARFA 数据成功地展示了我们的方法。最后，我们研究了受杂波影响和干涉测量校正的床解释对冰层厚度估计、基础水头梯度和推断的冰下水体的潜在范围的影响。相对于明确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。我们使用在加拿大北极德文冰盖上收集的 60 MHz 中心频率 MARFA 数据成功地展示了我们的方法。最后，我们研究了受杂波影响和干涉测量校正的床解释对冰层厚度估计、基础水头梯度和推断的冰下水体的潜在范围的影响。相对于明确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。我们使用在加拿大北极德文冰盖上收集的 60 MHz 中心频率 MARFA 数据成功地展示了我们的方法。最后，我们研究了受杂波影响和干涉测量校正的床解释对冰层厚度估计、基础水头梯度和推断的冰下水体的潜在范围的影响。