联合干涉相位和相干性幅度的极化干涉SAR最优相干性估计

发布时间：2018-03-16 11:11

本文选题：PolInSAR　切入点：极化状态　出处：《测绘学报》2017年01期 　论文类型：期刊论文

【摘要】：极化干涉SAR(PolInSAR)估计的复相干性包含相干性幅度和干涉相位,相干性幅度高低可以衡量干涉相位的质量,干涉相位是散射目标相位中心位置的重要体现,相干性幅度和干涉相位估计精度决定植被参数反演精度。由不同极化状态构成的相干区域中,相干性幅度差最大和干涉相位差最大的估计准则都从复相干性的某一方面建立最优估计函数,不能有效利用相干性幅度和相位信息。本文以相干区域边界为基础,结合相干性幅度和干涉相位信息,利用关联度建立联合干涉相位和相干性幅度的最优相干性估计准则,并在相干区域范围内获取最优散射机制及其相干性。试验结果表明,联合干涉相位和相干性幅度的最优估计准则可以有效区分地表散射和森林冠层散射的相干性和散射中心,提高植被高反演的可靠性。
[Abstract]:The complex coherence of polarimetric interferometry (PolInSAR) estimation includes coherence amplitude and interference phase, which can be used to measure the quality of interference phase, and the interference phase is an important reflection of the center position of the phase of scattering target. The precision of coherent amplitude and interferometric phase estimation determines the accuracy of vegetation parameter inversion. The estimation criteria for the maximum coherence amplitude difference and the maximum interference phase difference are derived from one aspect of complex coherence. The coherence amplitude and phase information can not be used effectively. In this paper, the coherent region boundary is used as the basis. Combining the information of coherence amplitude and interference phase, the optimal coherence estimation criterion of joint interference phase and coherence amplitude is established by using the correlation degree, and the optimal scattering mechanism and coherence are obtained in the range of coherent region. The experimental results show that, The optimal estimation criterion of joint interferometric phase and coherence amplitude can effectively distinguish the coherence and scattering center between surface scattering and forest canopy scattering and improve the reliability of vegetation high inversion.
【作者单位】：中南林业科技大学理学院;
【基金】：湖南省自然科学基金(2015JJ2201) 国家自然科学基金(41531068) 湖南省教育厅科学研究项目(13B153)~~
【分类号】：TN958

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