DEM extraction and its accuracy analysis with ground-based SAR interferometry

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Dong, J.^1 ; Yue, J.P.^1 ; Li, L.H.^2

School of Earth Science and Engineering, Hohai University, Nanjing, 210098, China^1

School of Land Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China^2

关键词: Accuracy analysis;    Differential phase;    Digital elevation model;    Error expressions;    Error propagation;    Ground based radar;    Ground-based SAR interferometry;    Ground-based synthetic aperture radars;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012239/pdf
DOI  :  10.1088/1755-1315/17/1/012239

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Two altimetry models extracting DEM (Digital Elevation Model) with the GBSAR (Ground-Based Synthetic Aperture Radar) technology are studied and their accuracies are analyzed in detail. The approximate and improved altimetry models of GBSAR were derived from the spaceborne radar altimetry based on the principles of the GBSAR technology. The error caused by the parallel ray approximation in the approximate model was analyzed quantitatively, and the results show that the errors cannot be ignored for the ground-based radar system. For the improved altimetry model, the elevation error expression can be acquired by simulating and analyzing the error propagation coefficients of baseline length, wavelength, differential phase and range distance in the mathematical model. By analyzing the elevation error with the baseline and range distance, the results show that the improved altimetry model is suitable for high-precision DEM and the accuracy can be improved by adjusting baseline and shortening slant distance.