極化補(bǔ)償—朗伯模型地形坡度估計(jì)方法

本文討論了利用單路經(jīng)全極化合成孔徑雷達(dá)(SAR- Synthetic Aperture Radar)復(fù)圖像數(shù)
據(jù)反演地表坡度信息的基本原理及難點(diǎn)。通過(guò)結(jié)合極化補(bǔ)償（Polarization Compensation）技術(shù)和Lambertian 反射模型，本文提出了一種新的坡度估計(jì)方法：Compensation-Lambertian算法。這個(gè)方法的主要思路是利用Lambertian 反射模型及極化補(bǔ)償前后雷達(dá)回波功率變化來(lái)估計(jì)地表方位向坡度。之后，利用地形變化引起的極化方位角偏移、方位向坡度以及雷達(dá)入射角度來(lái)計(jì)算地距向坡度。本文使用JPL 機(jī)載 L 波段全極化SAR 復(fù)圖像數(shù)據(jù)驗(yàn)證了算法的有效性。
關(guān)鍵詞 合成孔徑雷達(dá)；坡度；極化補(bǔ)償；朗伯模型
Abstract In this paper, the basic theory and problems of terrain slope estimation using single pass fully polarimetric SAR image complex data are discussed. A new slope estimation method, which is called Compensation-Lambertian algorithm, is introduced here. A key idea of our approach is to compute azimuth slope by using Lambertian reflection model and radar backscattering power variation before and after polarization compensation. And then, range slope can be calculated by polarization orientation shift, azimuth slope and radar incidence angle. JPL AIRSAR L-band polarimetric SAR images are used for validating this method.
Key words: synthetic aperture radar; slope; polarization compensation; Lambertian model