基于Bi-Mimics模型的GNSS-R农作物生物量监测理论研究  

Research on Crop Biomass Monitoring Using GNSS-R Technique based on Bi-Mimics Model

作　　者：吴学睿[1,2,3] 李颖[1] 李传龙[1] 

机构地区：[1]大连海事大学环境信息研究所,辽宁大连110626 [2]赤峰学院环境与资源管理系,内蒙古赤峰024000 [3]中国科学院遥感应用研究所/北京师范大学遥感科学国家重点实验室,北京100875

出　　处：《遥感技术与应用》2012年第2期220-230,共11页Remote Sensing Technology and Application

基　　金：遥感科学国家重点实验室开放基金项目(OFSLRSS201010)"基于物理模型的GNSS-R土壤水分反演算法研究";辽宁省自然科学基金项目(2010010111-401)"GNSS-R微波遥感海冰监测";国家自然科学基金青年基金项目(41101333)"联合车载微波辐射计测量数据和理论模型的农田辐射特征研究"

摘　　要：GNSS-R(GNSS-Reflectometry)遥感从机理上讲属于双站雷达,在一阶辐射传输方程Mimics(Michigan Microwave Canopy Scattering)模型的基础上,将其修改为双站散射模型Bi-Mimics(Bi-static-Mimics);将模型中的树干层去掉,保留树冠层和地表间的散射机制,发展了适用于农作物的Bi-Mimics模型。利用该模型,模拟分析在GNSS-R工作的L波段农作物的散射特性;根据GNSS-R设置模拟分析了镜像散射系数与农作物生物量之间的关系;并根据双站雷达理论公式,模拟了农作物生物量与接收机信号之间的关系。结果表明GNSS-R从理论上用来研究和监测农作物的生物量存在可行性,但研究工作有待进一步深入。GNSS-R（GNSS-Reflectometry） remote sensing is a kind of bistatic radar model.Mimics（Michigan Microwave Canopy Scattering）model is based on first-order radiative transfer equation.It is developed to Bi-Mimics（Bistatic-Mimics）model according to bistatic radar configuration.Bi-Mimics model is adapted to crop bistatic scattering model.In this model,the trunk layer is eliminated and the interactions between the trunk layer and ground layer are canceled.Using this model,numerical simulations about scattering properties at GNSS-R working L-band have been carried out.According to GNSS-R configurations,relationship between specular scattering coefficients and crop biomass is also simulated.And the bistatic radar equation is used to simulate the relationship between crop stem biomass and GNSS-R receiver signals.The simulations indicated that GNSS-R is a kind of technique to monitor crop biomass theoretically,but it needs to be further studied.

关 键 词：农作物生物量 Bi-Mimics模型 GNSS-R 镜像散射 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] TN95[自动化与计算机技术—控制科学与工程]