Preliminary Pointing Bias Calibration of ZY3-03 Laser Altimeter

• 作者: Junfeng XIE Ren LIU Yongkang MEI Wei LIU Jianping PAN
• 来源期刊: 测绘学报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Special Issue
• 页码范围: 91-100
• 页数: 10页
• 语种: 英文

摘要

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 0.33 m to 0.19 m 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 0.5 m in the flat terrain.