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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Millimeter-wave propagation in vegetation: experiments and theory
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Millimeter-wave propagation in vegetation: experiments and theory

机译：毫米波在植被中的传播：实验与理论

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Microwave/millimeter-wave propagation in woods and forests was investigated at 9.6, 28.8, and 57.6 GHz. The experiments were repeated over the same transmission paths, under both summer and winter conditions, i.e. with tree in leaf and without leaves. Of particular interest were the range dependence, beam broadening, and depolarization of millimeter-wave beams in vegetation and frequency dependence of these effects. The experiments have shown, in particular, that the range dependence is characterized by a high attenuation rate at short vegetation depths and a reduced attenuation rate at large depth. For trees fully in leaf, the transition between the two regimes can be abrupt and the change in attenuation rate substantial. Just after the transition significant beam broadening (and depolarization) occurs. A theory of millimeter-wave propagation in vegetation was derived using transport theory.
机译：在9.6、28.8和57.6 GHz频率下研究了微波/毫米波在木材和森林中的传播。在夏季和冬季条件下，即在有叶和无叶树的情况下，在相同的传输路径上重复实验。特别令人感兴趣的是植被中毫米波束的范围依赖性，光束展宽和去极化以及这些效应的频率依赖性。实验尤其表明，范围依赖性的特征在于在短的植被深度处的高衰减率和在大深度处的减小的衰减率。对于完全在树叶中的树木，这两种情况之间的过渡可能会突然发生，衰减率的变化会很大。过渡刚好发生时，会发生明显的光束展宽（和去极化）。利用传输理论推导了毫米波在植被中传播的理论。

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