Two-dimensional radar imaging of flowing avalanches
Two-dimensional radar imaging of flowing avalanches
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DOI：
10.1016/j.coldregions.2014.02.004
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发表时间：
2014-06-01
影响因子：
4.1
通讯作者：
Sovilla, Betty
中科院分区：
文献类型：
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作者：
Ash, Matthew;Brennan, Paul V.;Sovilla, Betty
雷达已成为雪崩研究的重要工具。然而，现有的雷达传感器遭受粗距离分辨率能力。这限制了他们收集的数据在验证雪崩动力学模型时的有用性。本文详细介绍了一种调频连续波相控阵雷达及其相关信号处理的发展，用于整个雪崩事件的非侵入性测量。该雷达在距离分辨率方面优于现有的雪崩雷达传感器，并且它使用相控阵接收器提供横向分辨率。该雷达自2010年冬季以来一直在瑞士Vallee de la Sionne雪崩测试场运行。它成功地收集了整个自然雪崩事件的测量数据。在本文中，我们展示了自然发生的雪崩的二维雷达图像，这是同类中的第一个，它以无与伦比的细节揭示了流动雪崩的层或颗粒的运动。此外，潜在的测量数据显示与跟踪雪崩前线在两个空间维度。这标志着向提供高质量雪崩测量数据库迈出了重要一步，以提高我们对雪崩动力学的了解。(C)2014爱思唯尔有限公司版权所有。
Radar has emerged as an important tool in avalanche research. However, existing radar sensors suffer from coarse range resolution capabilities. This limits the usefulness of the data they collect in validating models of avalanche dynamics. This paper details the development of a frequency modulated continuous wave, phased array radar, and its associated signal processing, for non-invasive measurements of entire avalanche events. The radar outperforms existing avalanche radar sensors in terms of range resolution, and it provides cross-range resolution using a phased array receiver. The radar has been operating at the Vallee de la Sionne avalanche test site in Switzerland since the 2010 winter season. It has successfully gathered measurements of entire natural avalanche events. In this paper we show two-dimensional radar images of a naturally occurring avalanche, the first of their kind, which reveal movements of layers or particles of the flowing avalanche in unparalleled detail. Furthermore, the potential of the measured data is shown with tracking of avalanche fronts in two spatial dimensions. This marks an important step towards providing a library of high-quality avalanche measurements to improve our knowledge of avalanche dynamics. (C) 2014 Elsevier B.V. All rights reserved.