Phase Difference Statistics Related To Sensor And Forest Parameters
Phase Difference Statistics Related To Sensor And Forest Parameters
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DOI：
10.1109/igarss.1992.576832
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发表时间：
1992-05
期刊：
影响因子：
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通讯作者：
A. Lopes;E. Mougin;A. Beaudoin;S. Goze;E. Nezry;R. Touzi;M. Karam;A. Fung
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文献类型：
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作者：
A. Lopes;E. Mougin;A. Beaudoin;S. Goze;E. Nezry;R. Touzi;M. Karam;A. Fung
通常SAR数据的信息内容主要包含在辐射偏振通道中，即Iu、Iw、Ihv和1.h四个背向散射强度。对于偏振数据，附加信息 1s 包含在偏振度 (l) 的极值中。在杂波的情况下，偏振信息由四个复杂的相干度给出，从中可以推导出平均偏振相位差（PPD）、相关系数或偏振度。至于辐射特征，偏振参数会被乘性散斑噪声和一些传感器效应破坏。本文的目的是将 (PPD) 分布与传感器、散斑和地形属性联系起来。最后给出了在裸土和不同松林林分上观察到的地形hh/w平均相位差和相干度大小的一些实验结果。
The information content of usual SAR data is mainly contained in the radiometric polarization channels i.e. the four Iu, Iw Ihv and 1.h backscattered intensities. For polarimetric data, additional information 1s contained in the extrema of the degree of polarization (l). In the case of clutter, polarimetric information is given by the four complex degrees of coherence, from which the mean Polarization Phase differences (PPD), correlation coefficients or degrees of polarization can be deduced. As for radiometric features, the polarimeric parameters are corrupted by multiplicative speckle noise and by some sensor effects. The purpose of this paper is to relate the (PPD) distribution to the sensor, speckle and terrain properties. Finally some experimental results on the variation of the terrain hh/w mean phase difference and of the magnitude of the degree of coherence observed on bare soil and on different pine forest stands are given.