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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Laboratory backscatter measurements over urea ice with a snow cover at Ku band
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Laboratory backscatter measurements over urea ice with a snow cover at Ku band

机译：Ku波段雪覆盖的尿素冰的实验室背向散射测量

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摘要

Indoor laboratory facilities were used to measure radar backscatter at Ku band (13.9 GHz) over urea ice, which has been shown to be structurally similar to sea ice. Data were collected at angles of incidence from normal to 55 degrees , over very thin (0 to 9 cm) ice, snow-covered ice, and ice with a hooded snow cover. The laboratory proved to be useful in creating and controlling specific physical properties of ice while keeping all other variables constant, a difficulty with measurements collected in the field. It was found that surface scattering and the dielectric constant are the dominant factors that cause variations (up to 15 dB) in the measured backscatter. The addition of a snow cover increased the surface roughness of the smooth ice, increasing the backscatter at 20 degrees incidence angle by about 11 dB and decreasing the backscatter at normal incidence by about 6 dB. The subsequent flooding of this snow layer increased the backscatter at all angles of incidence due to the increased dielectric constant of the wet slush layer. These results indicate the importance of the snow layer in influencing the surface characteristics of the ice sheet, which in turn modifies the backscattered signal.
机译：室内实验室设施被用来测量尿素冰上Ku频段（13.9 GHz）的雷达反向散射，事实证明，该散射体在结构上与海冰相似。在从非常薄（0到9厘米）的冰，大雪覆盖的冰和带罩雪盖的冰上，以从垂直到55度的入射角收集数据。事实证明，该实验室可用于创建和控制冰的特定物理特性，同时保持所有其他变量不变，这是在现场收集测量数据的困难。已经发现，表面散射和介电常数是导致被测反向散射变化（最大15 dB）的主要因素。附加的积雪增加了滑冰的表面粗糙度，使20度入射角的后向散射增加了约11 dB，法向入射时的后向散射减小了约6 dB。由于湿泥浆层的介电常数增加，随后该雪层的洪水在所有入射角均增加了反向散射。这些结果表明，雪层在影响冰盖表面特征方面的重要性，进而改变了反向散射信号。

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