机场场道道面结构层电磁特性反演的辨识方法

摘要

研究了基于系统辨识方法的机场场道道面介质层电磁特性的反演问题.在传统系统辨识法反演层状介质电磁特性的基础上,对电磁波在地下介质层中传输时传输模型的建立及回波时延的估计方法作了改进.新方法传输模型中考虑了发射带宽内各频率分量对介质层介电常数虚部的影响,同时引入超分辨率时延估计WRELAX算法估计回波信号的时延.实现了具有薄层的道面介质层电磁特性及其厚度的反演,并使道面下各介质层电磁特性的反演精度有所提高.%The electromagnetic properties of the runways structure are important and meaningful for quality surveillance, timing maintenance of runways and correct location of the target underground. The inversion method of the dielectric property and thickness of multilayer media is studied. Based on the conventional system identification method, the construction of the propagation model and the estimation method of time delay of echoes are modified in the proposed method. The new method considers the relationship of the image part of the permittivity and frequency, and introduces the weighted-RELAX (WRELAX) method to estimate the time delay of echoes. The electromagnetic properties and thickness of the runway structure containing the thin layer can be calculated and the estimation precision is improved, compared with the conventional system identification method.