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.
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.
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