Preliminary Pointing Bias Calibration of ZY3-03 Laser Altimeter

• Published in: Journal of Geodesy and Geoinformation Science Vol. 4; no. 3; pp. 91 - 100
• Main Authors: Xie, Junfeng, Liu, Ren, Yongkang Mei, Liu, Wei, Pan, Jianping
• Format: Journal Article
• Language: English
• Published: Beijing Surveying and Mapping Press 01.09.2021; School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China%Land Satellite Remote Sensing Application Center,Ministry of Natural Resources of P.R.China,Beijing 100048,China; School of Earth Sciences and Engineering,Hohai University,Nanjing 213022,China; College of Geoscience and Surveying Engineering,China University of Mining&Technology,Beijing 100083,China%Land Satellite Remote Sensing Application Center,Ministry of Natural Resources of P.R.China,Beijing 100048,China%School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China; Land Satellite Remote Sensing Application Center,Ministry of Natural Resources of P.R.China,Beijing 100048,China; School of Earth Sciences and Engineering,Hohai University,Nanjing 213022,China%Land Satellite Remote Sensing Application Center,Ministry of Natural Resources of P.R.China,Beijing 100048,China
• Subjects: Accuracy; Altimeters; Bias; Calibration; Elevation; Laser altimeters; Lasers; Performance evaluation; Satellites; Terrain; ziyuan3-03 satellite|spaceborne laser altimeter|terrain matching|geometric calibration|accuracy assessment; geometric calibration; terrain matching; ZiYuan3-03 satellite; spaceborne laser altimeter; accuracy assessment
• ISSN: 2096-5990; 2096-1650
• DOI: 10.11947/j.JGGS.2021.0308

ZiYuan3-03 (ZY3-03) satellite was launched on July 25, 2020, equipped with China’s second-generation laser altimeter for earth observation. In order to preliminarily evaluate the in-orbit performance of the ZY3-03 laser altimeter, the pointing bias calibration based on terrain matching method was adopted. Three tracks of laser data were employed for the ZY3-03 laser altimeter calibration test. Three groups of pointing parameters were obtained respectively, and the mean value of pointing is considered as the optimal calibration result. After calibration, ZY3-03 laser pointing accuracy is greatly improved by the method, and its pointing accuracy is approximately 12.7 arcsec. The first-track laser data on the Black Sea surface is used to evaluate the relative elevation accuracy of ZY3-03 laser altimeter after pointing bias calibration, which is improved from 0.33m to 0.19m after calibration. Meanwhile, the absolute elevation accuracy of ZY3-03 laser altimeter after pointing bias calibration is evaluated by the Ground Control Points (GCPs) measured by RTK (Real-Time Kinematic), which is better than 0.5m in the flat terrain.