摘要
相干区域的长轴作为复相干系数间最长的连线,反映了复干涉相干系数线性变化趋势,因此在基于相干散射模型的极化干涉森林应用中具有重要研究意义。针对遍历搜索方法估计长轴效率低、精度受采样间隔限制的不足,该文提出一种相干区域长轴的快速估计方法。该方法将相干区域外切矩形的切点连线作为长轴的初始估计,利用逼近技术求解长轴。为提高森林高度估计性能,该文还提出一种应用长轴信息反演森林参数的方法。松树林的极化干涉仿真数据的结果表明,快速估计方法运行时间远低于遍历搜索方法,且长轴估计精度高于遍历搜索方法,利用长轴信息估计的森林高度更接近于仿真森林高度。
The longest axis in coherence region,which gives the largest distance between any two coherences,is significant in forestry applications using coherence scattering model,because it reflects the linear variation of complex coherences with the polarization states.To improve the efficiency and accuracy of traversal search,a fast approach is proposed to estimate longest axis in this paper.It uses the line segment of the tangent points of the rectangle externally tangent to coherence region to get the initial estimation for the longest axis.Nest,it obtains the longest axis using the approximation technique.To improve forest height estimation,a forest parameter inversion technique using the longest axis is presented.Results of simulated data for pine forest show the fast approach consumes much less computation time and gives better estimations for the longest axis than traversal search method.Results also show that the introduction of longest axis in forest parameter inversion yields closer estimations to the true forest height.
出处
《电子与信息学报》
EI
CSCD
北大核心
2010年第3期548-553,共6页
Journal of Electronics & Information Technology
基金
中国科学院知识创新工程青年人才领域前沿项目资助课题
关键词
极化干涉合成孔径雷达
森林参数反演
相干区域
相干散射模型
Polarimetric interferometric SAR
Forest parameter inversion
Coherence region
Coherence scattering model
