论文部分内容阅读
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。
Grounding line is the dividing line between inland ice sheet and floating ice shelf. It is an important parameter in the study of glacier dynamics. The accurate definition of its location affects the material balance calculation of Antarctic ice sheet and mathematical modeling of glacier dynamics. This paper introduces the basic principle of DInSAR extracting ground line, and uses DDInSAR method to remove the ice flow phase to accurately detect the interference of ground line position. By judging the tangential phase in the double-difference interferogram, Boundaries get the ground line extraction results. Through the comparison with the existing products of the whole Antarctic ground wire, it is fully proved that DDInSAR is an effective technical means for extracting the ground wire in a wide range, continuous and high precision. It can be used to extract and update the ground wire in different regions, seasons and years in the future Change research laid the foundation.