Abstract
Abstract. After GLAS (Geo-science Laser Altimeter System) loaded on the ICESat (Ice Cloud and land Elevation Satellite), satellite laser altimeter attracts more and more attention. ZY3-02 equipped with the Chinese first satellite laser altimeter has been successfully launched on 30th May, 2016. The geometric calibration is an important step for the laser data processing and application. The method to calculate the laser pointing angle error based on existed reference terrain data is proposed in this paper. The public version terrain data, such as 90m-SRTM and 30m-AW3D30, can be used to estimate the pointing angle of laser altimeter. The GLAS data with simulated pointing error and actual ZY3-02 laser altimetry data is experimented to validate the algorithm. The conclusion will be useful for the future domestic satellite laser altimeter.
Highlights
ZY3-02 satellite was successfully launched on 30th May, 2016, which has equipped with the first satellite laser altimeter of China for earth observing
The laser altimeter on the ZY3-02 satellite was designed to validate the acquisition of the global high accuracy elevation control points and the possibility of stereo images accuracy improvement without GCPs (Ground Control Points) (Tang, et al, 2016)
For ZY3-02 satellite laser altimeter, the pointing angle has some deviation between the truth and the measurement in the laboratory, which can not meet the demand of high accuracy laser data processing and the field experiment of laying ground detectors whose position should has little error calculated by the laser pointing angle value
Summary
ZY3-02 satellite was successfully launched on 30th May, 2016, which has equipped with the first satellite laser altimeter of China for earth observing. The on-orbit geometric calibration of satellite laser altimeter is a basic and indispensible for the effective application of altimetry data, especially in order to be used as control points. For ZY3-02 satellite laser altimeter, the pointing angle has some deviation between the truth and the measurement in the laboratory, which can not meet the demand of high accuracy laser data processing and the field experiment of laying ground detectors whose position should has little error calculated by the laser pointing angle value. This paper proposes the ZY3-02 satellite laser pointing angle coarse calibration method based on the terrain matching, and the fine calibration needs other method, such as the ground detectors with high accuracy position measured by RTK-GPS.
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