Correction Method of Digital Elevation Model in Shadow Region of Interferometric Synthetic Aperture Radar
An interferometric synthetic aperture and digital elevation model technology, applied in the field of electronic information technology radar, can solve problems such as inapplicability to large-area shadow areas, and achieve the effect of eliminating differences in resolution and coordinate systems, reasonably and effectively correcting, and improving integrity.
Active Publication Date: 2021-07-09
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0006] The purpose of the present invention is to provide a digital elevation model correction method for interferometric synthetic aperture radar shadow areas, to overcome the shortcomings of existing correction methods that are not suitable for large-area shadow areas, thereby improving the integrity of interferometric synthetic aperture radar elevation products
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0038]The present invention uses the external low-precision digital elevation model data to correct the digital elevation model of the large-area shadow area in the interferometric synthetic aperture radar image, and firstly eliminates the resolution of the external digital elevation model data and the interferometric synthetic aperture radar digital elevation model data and the coordinate system difference, and then through the correction of the overall elevation deviation in the shaded area and the smoothing of edge jumps, the effective correction of the digital elevation model in large-area shadowed areas is realized, thereby overcoming the problem that the interpolation-based digital elevation model correction method is...
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A digital elevation model correction method for an interferometric synthetic aperture radar shadow area, the method comprising: corresponding the ASTER DEM data corresponding to the scene area with the digital elevation model data of the interferometric synthetic aperture radar slant range plane, wherein the ASTER DEM is an advanced spaceborne Global digital elevation model of thermal emission and reflection radiometer; detect and extract the shadow area in the interferometric synthetic aperture radar image and extract its edge; for each closed shadow area in the interferometric synthetic aperture radar image, determine the interference by statistical edge elevation The overall elevation deviation between the synthetic aperture radar digital elevation model and ASTER DEM in the shaded area; based on the calculated overall elevation deviation, the corrected ASTER DEM value is calculated, and the elevation value of each pixel in the shaded area is calculated using the corrected ASTER DEM value is supplemented. The invention uses external low-precision digital elevation model data to correct the digital elevation model obtained by interference processing, thereby improving the integrity of the digital elevation model data.
Description
technical field [0001] The invention relates to the technical field of electronic information technology radar, in particular to a method for correcting a digital elevation model of an interference synthetic aperture radar shadow area. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is a technology that uses the interferometric phase information of two-channel synthetic aperture radar complex data to extract the elevation information or change information of the surface, and it extends the measurement of synthetic aperture radar to three-dimensional space , with all-weather, all-weather, high-precision characteristics, so it has a wide range of applications in many fields such as topographic surveying and mapping, glacier research, marine surveying and mapping, and land subsidence monitoring. [0003] In terrain surveying and mapping applications, although interferometric SAR has high-precision surveying and mapping capabilities, due to some in...
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IPC IPC(8): G01S13/90G01C5/00
CPCG01C5/00G01S13/9023
Inventor 李芳芳丁赤飚胡玉新张月婷仇晓兰胡东辉
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI