CryoSat-2 SARIn Data Interference Processing and DEM Acquisition

武汉大学学报(信息科学版) Pub Date : 2017-06-05 DOI:10.13203/J.WHUGIS20150568

董玉森, ChangHsing-Chung, 张奎, 马娇, 汪舒, 孙攀

引用次数: 0

摘要

The CryoSat-2 is equipped with a synthetic aperture/interferometric radar altimeter that can accurately detect changes in sea and continental ice surface elevation. The interferometric data provided by its synthetic aperture interferometric mode (SARIn) can be used to invert ground elevation information using traditional differential interferometry techniques. However, the SARIn secondary product released by the European Space Agency does not fully utilize this information. Introduced the working principle of SARIn mode, and combined with traditional interferometry technology, proposed an algorithm and process for extracting digital elevation models using SARIn level 1b (L1b) data. Eliminate erroneous information in the data through data quality inspection; By selecting appropriate unwrapping starting points through signal strength and coherence, the interference data can be unwrapped row by row; Calculate the satellite perspective, combine the satellite attitude, velocity, position, and line of sight distance information to calculate the three-dimensional information of ground points, and finally interpolate to generate SARIn DEM (digital elevation model). Using this algorithm to perform interferometric processing on SARIn L1b data from January to April 2012, a digital elevation model of the local area of the Lambert Glacier Basin in Antarctica was obtained. By comparing ICESat DEM and RMAP DEM, it is shown that SARIn DEM has high accuracy and can meet the research of elevation changes in regions such as the North and South Poles.

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CryoSat-2 SARIn数据干涉处理及DEM获取

CryoSat-2搭载的合成孔径/干涉雷达高度计能够精确地探测海洋与大陆冰面高程变化，其合成孔径干涉模式（synthetic aperture interferometric mode，SARIn）提供的干涉数据可以利用传统差分干涉测量技术反演地面的高程信息，但在欧洲空间局公布的SARIn二级产品没有充分地利用这一信息。介绍了SARIn模式工作原理，并结合传统干涉测量技术，提出利用SARIn一级（level 1b，L1b）数据进行数字高程模型提取的算法和流程。通过数据质量检查，剔除数据中的错误信息；通过信号强度和相干性选择合适的解缠起点，实现干涉数据的逐行解缠；计算出卫星视角，结合卫星姿态、速度、位置和视线向距离等信息计算地面点的三维信息，最终插值生成SARIn DEM（digital elevation model）。利用该算法对2012年1月~4月的SARIn L1b数据进行干涉处理，获得了南极Lambert冰川流域局部地区的数字高程模型。通过对比ICESat DEM和RMAP DEM，表明SARIn DEM具有较高的精度，能够满足南北极等地区的高程变化研究。

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来源期刊

武汉大学学报(信息科学版)

CiteScore

2.70

自引率

0.00%

发文量

7114

期刊介绍： Geomatics and Information Science of Wuhan University is a surveying and mapping academic journal supervised by the Ministry of Education and sponsored by Wuhan University. It is also a source journal included in EI (Engineering Index). Since its founding in 1957, the journal has been publicly issued in the form of a monthly journal, originally named "Journal of Wuhan University of Surveying and Mapping". At present, the journal is edited by Academician Li Jiancheng. The purpose of this journal is to utilize China's advantages in surveying and mapping disciplines, serve both the domestic and international communities, publish with an open attitude, and strive to become China's excellent surveying and mapping journal brand. The journal publishes innovative and highly valuable surveying and mapping academic achievements, showcases the latest and highest level of surveying and mapping research in China, and aims to promote academic exchanges in surveying and mapping, guide the research direction of surveying and mapping science, promote the progress of related science and technology, and serve the development of the entire surveying and mapping industry.