SAR image quality assessment of satellite TH-2-01

doi:10.11947/j.AGCS.2022.20210420

Abstract

Abstract: The satellite TH-2-01 was successfully launched on April 30, 2019, equipped with the high-resolution synthetic aperture radar(SAR) and the high-precision inter-satellite relative state measurement equipment and other payloads, which was able to obtain all-day and all-weather InSAR image data and auxiliary measurement data for scientific experimental research, land and resources census, geographic information mapping and other fields. In order to measure the imaging capability of the satellite, we comprehensively evaluated and analyzed the satellite A and satellite B of TH-2-01 by employing objective quality evaluation indexes based on point target and area target. The analysis results prove that the imaging quality of both satellite A and satellite B are able to meet the requirements of the satellite design index, which means that the images of satellite TH-2-01 can meet high-accuracy in the application of target area selection and analysis, target identification, target feature extraction, etc. Most of the objective indexes of satellite A and satellite B are similar, and the spatial resolution in the range direction is better than that in the azimuth direction, and the values of the range direction integral side lobe ratio and the peak side lobe ratio are better than that in the azimuth direction, that is, the more concentrated the energy of the point targets is in the range direction, the better ability to detect the dark target and the weak target from the radar image. The experimental results show, the images of satellite A has lower peak side lobe ratio in the range direction, that is, satellite A is slightly better than satellite B in range direction imaging quality.

Key words: SAR, image quality, TH-2

CLC Number:

P236

WANG Wei, LI Chunyan, SUN Tao, YANG Jianfeng, YU Xiaqiong, WU Yukuan. SAR image quality assessment of satellite TH-2-01[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(12): 2508-2516.

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