空间科学学报2026，Vol.46Issue(2)：334-347,14.DOI:10.11728/cjss2026.02.2025-0052
基于双粗糙界面数值仿真模型的机载雷达山岳冰川介电虚部反演
Retrieval of the Imaginary Part of the Dielectric Constant in Mountain Glaciers Using Airborne Radar Based on a Dual Rough Interface Numerical Simulation Model
摘要
Abstract
As a key indicator of global climate change and an essential freshwater resource,the accu-rate acquisition of multiple physical parameters of glaciers holds significant importance for global cli-mate change research,ecological conservation,and water resource planning.In China,glaciers are pre-dominantly mountain glaciers distributed in high-altitude regions.Constrained by harsh environments and complex terrain,traditional in-situ detection methods fail to achieve large-scale continuous monitor-ing of internal glacier parameters.Satellite-borne glacier remote sensing,meanwhile,faces limitations in resolution and interference from complex ground clutter in mountainous glacier regions,and thus has yet to be operationalized.Airborne radar,with its superior spatial resolution and flexible detection capabili-ties,has become a critical technical tool for glacier monitoring and research.However,airborne detec-tion of mountain glaciers still confronts challenges posed by undulating ice surfaces and complex sub-glacial topography:scattering clutter from the uneven ice surface interferes with radar signal interpreta-tion and precise inversion of key parameters,while the intricate subglacial structure and scattering loss-es caused by ice surface topography interact with dielectric losses within the ice,impeding accurate in-version of glacier dielectric constants.To address these challenges,this study integrates airborne ultra-wideband radar detection data from mountain glaciers with the Pseudo-Spectral Time Domain(PSTD)numerical simulation method.A coupled model of ice surface-subglacial dual interface topography and dielectric parameters is established.Through two-dimensional PSTD electromagnetic simulations,the in-teraction mechanism between topographic scattering and ice dielectric loss is elucidated.Furthermore,an inversion method for the imaginary part of the ice layer dielectric constant in measured regions is pro-posed based on dynamic range analysis.For the measured data from Laohugou Glacier No.12,iterative optimization converges the estimated imaginary part value to 6.0×10-4.The relative error between the estimated imaginary part and the theoretical mean is 21%.Cross-validation between simulation results and theoretical models demonstrates that this method effectively improves the inversion accuracy of glacier dielectric parameters in complex terrain by decoupling the synergistic interference between topo-graphic relief and dielectric parameters,thereby offering a viable solution for studying internal dielectric properties of glaciers.关键词
山岳冰川/机载雷达探冰/数值模拟仿真/伪谱时域法/参数反演Key words
Mountain glaciers/Airborne radar ice sounding/Numerical simulation/Pseudo-spectral time domain method/Parameter inversion分类
天文与地球科学引用本文复制引用
沙子意,朱迪,白东锦,徐国庆,马剑英,刘天澳..基于双粗糙界面数值仿真模型的机载雷达山岳冰川介电虚部反演[J].空间科学学报,2026,46(2):334-347,14.基金项目
国家重点研发计划项目资助(2021YFB3900100) （2021YFB3900100）
