Generating and Evaluating Digital Terrain Model with TanDEM-X Bistatic SAR Interferometry

SUN Yafei; JIANG Liming; LIU Lin; SUN Yongling; WANG Hansheng

doi:10.13203/j.whugis20130618

Volume 41 Issue 1

Jan. 2016

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Geomatics and Information Science of Wuhan University > 2016 > 41(1): 100-105. > DOI: 10.13203/j.whugis20130618

SUN Yafei, JIANG Liming, LIU Lin, SUN Yongling, WANG Hansheng. Generating and Evaluating Digital Terrain Model with TanDEM-X Bistatic SAR Interferometry[J]. Geomatics and Information Science of Wuhan University, 2016, 41(1): 100-105. DOI: 10.13203/j.whugis20130618

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Generating and Evaluating Digital Terrain Model with TanDEM-X Bistatic SAR Interferometry

1.
State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Natural Science Foundation of China,Nos. 41274024, 41431070, 41321063; the National Basic Research Program of China, No. 2012CB957702; the Hundred Talents Program of the Chinese Academy of Sciences,No. Y205771077; the DLR TanDEM-X AO Project,No. XTI_LAND0413; The ESA-MOST Dragon-3 Cooperation Program,No. 10674.

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Received Date: October 27, 2013
Published Date: January 04, 2016

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Abstract

The paper introduces the bistatic SAR system of the TanDEM-X/TerraSAR-X, especially focusing on its flexible data acquisition model and the special advantages of a zero-time baseline. We present a bistatic InSAR processing method for DEM generation with TanDEM-X/TerraSAR-X data, highlighted by a phase difference strategy as a means of differencing bistatic interferograms and simulated phase from an external DEM, e.g. SRTM DEM. This strategy reduces the residual phase and improves the efficiency and the precision of phase unwrapping. We take account of the bistatic geometry and the corresponding zero Doppler time in SAR interferometric processing. The absolute phase offset was calibrated with some external ICESat points. A case study was carried out to generate the DEM product over the Puruogangri Ice Field in the Tibetan Plateau. Compared with the SRTM-X DEM and ICESat elevation, our preliminary results demonstrate the great potential of the TanDEM-X bistatic InSAR technology for mapping surface topography.
- TanDEM-X,
- bistatic SAR interferometry,
- digital elevation model,
- the Puruogangri Ice Field

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Generating and Evaluating Digital Terrain Model with TanDEM-X Bistatic SAR Interferometry

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