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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Influence of Incidence Angle on the Coherent Copolar Polarimetric Response of Rice at X-Band
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Influence of Incidence Angle on the Coherent Copolar Polarimetric Response of Rice at X-Band

机译：入射角对水稻在X波段相干极化极性响应的影响

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摘要

The coherent nature of the acquisition by TerraSAR-X of both copolar channels (HH and VV) enables the generation of many different polarimetric observables with physical interpretation, as have recently been used for monitoring rice fields. In this letter, the influence of incidence angle upon these polarimetric observables is analyzed by comparing three stacks of images that were acquired simultaneously at different incidence angles (22 $^{circ}$, 30 $^{circ}$, and 40 $^{circ}$) during a whole cultivation campaign. We show that the response of observables related to dominance (entropy, ratios of components) and type of scattering mechanisms (alpha angles) is not greatly influenced by incidence angle at some stages: early and advanced vegetative phases, and maturation. Moreover, the acquisition geometry drives the sensitivity to the presence of the initial stems and tillers, being detected earlier at shallower angles. This analysis is a necessary step before studying potential methodologies for combining different orbits and beams for reducing the time between acquisitions for monitoring purposes.
机译：TerraSAR-X对两个同极通道（HH和VV）的采集具有相干性，这使得能够通过物理解释生成许多不同的偏振可观测值，最近已用于监测稻田。在这封信中，通过比较在不同入射角下同时采集的三叠图像，分析了入射角对这些偏振可观察物的影响（22 $ ^ {circ } $ ，30 $ ^ {circ} $ ，和40个 $ ^ {circ} $ ）。我们表明，在某些阶段（早期和晚期植物生长阶段以及成熟阶段），入射角对观测值与优势度（熵，组分的比例）和散射机制类型（α角）的相关性影响不大。此外，采集几何形状提高了对初始茎和分ers存在的敏感性，可以在较浅的角度更早地检测到。在研究用于组合不同轨道和波束以减少用于监视目的的两次获取之间的时间的潜在方法之前，进行此分析是必要的步骤。

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