中文摘要：

接地线是内陆固定冰盖和漂浮冰架的分界线,是冰川动力学研究的重要参数,其位置的准确界定影响到南极冰盖物质平衡计算以及冰川动力学数学建模。介绍了DInSAR提取接地线的基本原理,并利用DDInSAR的方法去除冰流相位对准确探测接地线位置的干扰,通过判读双差干涉图中由潮汐相位引起的密集条纹中靠近内陆一侧的分界线得到接地线提取结果。通过和已有的全南极接地线产品对比验证,充分说明了DDInSAR是大范围、连续以及高精度提取接地线的有效技术手段,为今后极区不同地区、不同季节和年份的接地线提取及动态变化研究奠定了基础。

英文摘要：

A grounding line is the boundary between inland grounded ice sheet and a floating ice shelf and an important parameter in glacier dynamics.Precise extraction of the grounding line has a great impact on the Antarctic ice sheet mass balance and mathematical modeling of glacier dynamics.In this paper,the basic principles of grounding line extraction using DInSAR are introduced.The interference of ice flow on extraction of grounding line is removed by double differential SAR interferometry（DDInSAR）and the grounding line is detected through an interpretation of the inner of dense fringes induced by ocean tide in double differential SAR interferogram images.The mapping result is verified by comparing it to the Antarctic grounding line product,demonstrating that DDInSAR is an effective technique suitable for large-scale,continuous and high-precision grounding line extraction,thus laying a foundation for grounding line extraction and understanding of the dynamic changes in polar region.