三层植被极化干涉建模及参数反演新方法研究

The polarimetric InSAR model and a novel method for parameter inversion of the three-layer vegetation

两层植被结构模型是传统三阶段植被参数反演方法的基础,当实际植被结构为三层结构时,三阶段植被参数反演方法精度变差.针对该问题,建立了与三层植被结构模型对应的极化SAR干涉复相关系数模型,分析了传统三阶段植被参数反演方法精度变差的原因,提出了基于双基线极化SAR干涉的三层植被参数反演新方法,新方法充分考虑了三层植被干涉复相关系数的特征,比传统的三阶段植被参数反演方法更适合于三层植被结构,反演性能更好.实验结果验证了所建的复相关系数模型的正确性和反演新方法的优越性.

When the real vegetation is composed of three layers,the accuracy of the traditional three-stage vegetation parameter inversion method becomes lower.To solve this problem,a new polarimetric SAR interferometric coherence model was established.Based on this new model,the reason why the accuracy of the tranditional three-stage vegetation parameter inversion method becomes lower was analyzed and a new vegetation parameter inversion method based on dual-baseline polarimetric SAR interferometry was proposed.Compared to the tranditional inversion method,this new method is more suitable to the three-layer vegetation constructions and has higher accuracy.Experimental results validated the correctness and the superiority of the new method.