Journal of Geodesy and Geoinformation Science ›› 2021, Vol. 4 ›› Issue (3): 91-100.doi: 10.11947/j.JGGS.2021.0308

• Special Issue • Previous Articles    

Preliminary Pointing Bias Calibration of ZY3-03 Laser Altimeter

Junfeng XIE1,2,3(),Ren LIU1,2(),Yongkang MEI1,4,Wei LIU1,Jianping PAN3   

  1. 1. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources of P.R. China, Beijing 100048, China
    2. School of Earth Sciences and Engineering, Hohai University, Nanjing 213022, China
    3. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074,China
    4. College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China
  • Accepted:2021-01-15 Online:2021-09-20 Published:2021-10-09
  • Contact: Ren LIU;
  • About author:Junfeng XIE (1981—), male, PhD, majors in satellite attitude determination, spaceborne laser altimeter calibration, and remote sensing application. E-mail:
  • Supported by:
    Research and Development of Forest Resources Dynamic Monitoring and Forest Volume Estimation with LiDAR Data(2020YFE0200800);High Resolution Remote Sensing, Surveying and Mapping Application Program(42-Y30B04-9001-19/21);Active and Passive Composite Mapping and Application Technology with Visible, Infrared and Laser Sensors(D040106);Multi-beam Terrain Detection Laser and Its Application Technology(D040105);National Natural Science Foundation of China(41571440);National Natural Science Foundation of China(41771360);National Natural Science Foundation of China(41971426);Class B Project of Beijing Science and Technology Association Jinqiao Project Seed Fund(ZZ19013);Innovative Youth Talents Program, MNR(12110600000018003930)


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.

Key words: ZiYuan3-03 satellite; spaceborne laser altimeter; terrain matching; geometric calibration; accuracy assessment