基于改进剥层法的南极冰盖密度反演算法

Antarctic Ice Sheet Density Inversion Algorithm Based on Improved Layer Stripping Method

南极冰盖的密度-深度数据是建立高精度表面物质平衡模型时的关键参数。该文提出一种基于调频连续波(FMCW)雷达的冰盖密度和介电常数反演算法。该算法首先利用剥层反演法初步反演密度剖面,然后利用反演的密度和冰盖密实化经验公式建立密度剖面模型,最后通过优化算法寻找最优密度模型参数,从而达到校准密度的目的。基于理论冰盖模型和实测雷达数据的实验结果验证了算法的有效性。

The density-depth relationship of the Antarctic ice sheet is one of the key parameter when building the high-precision surface mass balance model.An ice sheet density and permittivity inversion method is proposed based on Frequency Modulated Continuous Wave(FMCW)radar.The density profile is preliminarily inverted firstly by the layer stripping inversion method.Then the density model is established by the shallow inversion density and the ice sheet densification empirical equation.Finally,the optimal model parameters are found through the optimization algorithm to calibration the density.Experimental results based on theoretical ice sheet models and measured radar data verify the effectiveness of the new method.