Laboratory and Tower-Based Microwave Measurements of Spruce Defoliation

[Proceedings] IGARSS '92 International Geoscience and Remote Sensing Symposium Pub Date : 1992-05-26 DOI:10.1109/IGARSS.1992.578376

J. Pulliainen, K. Heiska, J. Hyyppa, M. Hallikainen

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引用次数: 2

Abstract

This paper presents the results achieved from microwave radar backscattering measurements of defoliating spruces. Individual spruces were measured in an unechoic chamber and in outdoor conditions and the natural defoliation was simulated by gradually removing the needles of the trees. The measurements were carried out using 5/10 GHz and 35 GHz radar systems. The influence of defoliation to the volume backscattering and extinction coefficient of spruce canopy has been determined from the measured data. The results show that defoliation has a considerable effect on radar backscattering for 10 GHz linear polarizations. At 35 GHz the achieved data indicate a rather complicated and controversial backscattering behaviour with decreasing degree of defoliation. At 5 GHz the effect of defoliation on the backscattering coefficient is negligible. Helicopter-borne measurements of natural defoliation using the 5/10 GHz radar are presented for comparison. Additionally, measurements using a 90 GHz radiometer were conducted. But, by the time of preparing this paper the analysis of these results was not finalised.

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云杉落叶的实验室和塔式微波测量

本文介绍了微波雷达对落叶云杉的后向散射测量结果。在无回声室和室外条件下测量了单个云杉，并通过逐渐去除树木的针叶来模拟自然落叶。测量使用5/10 GHz和35 GHz雷达系统进行。利用实测数据确定了落叶对云杉冠层体积后向散射和消光系数的影响。结果表明，在10ghz线极化条件下，落叶对雷达后向散射有相当大的影响。在35 GHz时，获得的数据显示出一个相当复杂和有争议的后向散射行为，随着落叶程度的降低。在5 GHz时，落叶对后向散射系数的影响可以忽略不计。利用5/10 GHz雷达对直升机上的自然落叶进行了测量，以供比较。此外，使用90 GHz辐射计进行了测量。但是，在准备本文时，对这些结果的分析还没有完成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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[Proceedings] IGARSS '92 International Geoscience and Remote Sensing Symposium

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