基于 GNSS-IR 技术的南极海冰积雪深度反演研究  

Research on Inversion of Antarctic Sea Ice Snow Depth Based on GNSS-IR Technology

作　　者：曾棋 张胜凯[1] 龚力 肖驰 李斐[1] ZENG Qi;ZHANG Shengkai;GONG Li;XIAO Chi;LI Fei(China Antarctic Surveying and Mapping Research Center,Wuhan University,Wuhan 430079,China;Key Laboratory of Earthquake Geodesy,China Earthquake Administration,Wuhan 430071,China;Hubei Provincial Seismological Bureau,Wuhan 430071,China)

机构地区：[1]武汉大学中国南极测绘研究中心,湖北武汉430079 [2]中国地震局地震大地测量重点实验室,湖北武汉430071 [3]湖北省地震局,湖北武汉430071

出　　处：《测绘地理信息》2024年第3期14-18,共5页Journal of Geomatics

基　　金：国家重点研发计划(2017YFA0603104);国家自然科学基金(41730102,41531069)。

摘　　要：南极海冰的生长消融与全球气候变化密切相关,而海冰上覆盖的积雪会对海冰的生长消融产生较大的影响。利用南极中山站附近海冰上的GPS数据,采用GNSS-IR(GNSS interferometric reflectometry)技术对海冰上覆积雪深度进行反演。首先,采用最小二乘谐波分析(least-squares harmonic estimation,LS-HE)方法提取反射信号的主波峰,计算反射面到天线相位中心的距离;其次,采用DBSCAN(density-based spatial clustering of applications with noise)聚类算法对反演结果进行质量控制;最后,利用现场实测雪深数据对反演结果进行了验证,平均偏差为-0.01 m,RMSE为0.012 m,表明GNSS-IR技术能够有效反演海冰表面积雪深度。The growth and melting of Antarctic sea ice are closely related to global environmental changes,and the snow covered on the sea ice will have a large impact on the growth of sea ice.In this paper,GNSS-IR is used to analyze GPS da⁃ta on sea ice near Zhongshan Station in Antarctica in order to invert the depth of snow overlying the sea ice.First,the leastsquares harmonic estimation method is used to extract the main wave peak of the reflected signal,which is used to calcu⁃late the distance from the reflecting surface to the antenna phase center.Then,the DBSCAN clustering algorithm is used to quality control the inversion results.Finally,the in⁃version results are verified by the actual snow depth data in the field.The average deviation after clustering is about-0.01 m,and the RMSE is about 0.012 m,indicating that the GNSS-IR technique can effectively invert the snow depth on the surface of sea ice.

关 键 词：GNSS-IR 南极海冰 最小二乘谐波分析 积雪深度 DBSCAN聚类算法 

分 类 号：P228[天文地球—大地测量学与测量工程]