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提出了一种新的方法来研究大豆冠层的极化后向散射系数。这种方法结合分支模型〔1〕和PACT模型〔2〕的优点:前者强调植物结构和相干效应的重要性;后者则采用天线阵的概念来考虑植株间的相互作用,适合应用于大豆等在耕作实践中通常具有准周期的作物。而且,针对描述轴对称散射体取向的欧拉角和球坐标系统中的仰角、方位角的联系,提出了更符合物理实际的新的关系。由我们的方法预测的后向散射系数和实验数据的良好吻合,证明了其有效性。
A new method was proposed to study the polarization backscatter coefficient of soybean canopy. This method combines the advantages of branch model [1] and PACT model [2]: the former emphasizes the importance of plant structure and coherence effect; the latter uses the concept of antenna array to consider the plant-plant interaction and is suitable for soybean and so on Quasi-periodic crops are often used in farming practices. Moreover, a new relationship that is more in line with the physical reality is proposed for the relationship between the Euler angles and the azimuth angles in the system of axisymmetric scatterers. The good agreement between the backscatter coefficients predicted by our method and the experimental data proves its effectiveness.