Acta Geodaetica et Cartographica Sinica >

2017 , Vol. 46 >Issue 6: 714 - 723

DOI: https://doi.org/10.11947/j.AGCS.2017.20160597

ZY3-02 Laser Altimeter On-orbit Geometrical Calibration and Test

  • TANG Xinming ,
  • XIE Junfeng ,
  • FU Xingke ,
  • MO Fan ,
  • LI Shaoning ,
  • DOU Xianhui
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  • 1. Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China;
    2. School of Surveying, Mapping and Geoinformation Science, Liaoning Technology University, Fuxin 123000, China;
    3. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China

Received date: 2016-11-28

  Revised date: 2017-05-02

  Online published: 2017-06-28

Supported by

The Project of High Resolution Images Surveying and Mapping Application System(No.AH1601-9);The National Fund for Basic Surveying and Mapping (No.2016KJ0204);The National Science Foundation for Young Scientists of China(No. 41301525);The National Natural Science Foundation(No. 41571440);The Young academic leaders Fund of National geographic information bureau of surveying and mapping(No. D1501)

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Abstract

ZY3-02 is the first satellite equipped with a laser altimeter for earth observation in China .This laser altimeter is an experimental payload for land elevation measurement experiment. The ranging and pointing bias of the laser altimeter would change due to the launch vibration, the space environment difference or other factors, and that could bring plane and elevation errors of laser altimeter. In this paper, we propose an on-orbit geometric calibration method using a ground-based electro-optical detection system based on the analysis of ZY3-02 laser altimeter characteristic, and this method constructs the rigorous geometric calibration model, which consider the pointing and ranging bias as unknown systematic errors, and the unknown parameters are calibrated with laser spot's location captured by laser detectors and the minimum ranging error principle. With the ALOS-DSM data as reference, the elevation accuracy of the laser altimeter can be improved from 100~150 meters before calibration to 2~3 meters after calibration when the terrain slope is less than 2 degree. With several ground control points obtained with RTK in laser footprint for validation, the absolute elevation precision of laser altimeter in the flat area can reach about 1 meter after the calibration. The test results demonstrated the effectiveness and feasibility of the proposed method.

Key words： ZY3-02 satellite; laser altimeter; elevation precision; geometric calibration; ground-based laser detection

Cite this article

TANG Xinming , XIE Junfeng , FU Xingke , MO Fan , LI Shaoning , DOU Xianhui . ZY3-02 Laser Altimeter On-orbit Geometrical Calibration and Test[J]. Acta Geodaetica et Cartographica Sinica, 2017 , 46(6) : 714 -723 . DOI: 10.11947/j.AGCS.2017.20160597

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