Mixed Centroid Method for Spaceborne Laser Altimeter Calibration
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The on-orbit calibration of spaceborne laser altimeters is based on traditional geometric calibration in which the laser pointing angle error is the primary evaluation index. This study proposes a mixed centroid method for calculating the laser footprint center by using the geometric center of each energy level eliminating the abnormal energy level points, inverting the laser energy level distribution, and correcting the true footprint. Then, the mixed centroid method is compared with the traditional geometric center method and the centroid method. Simulation comparisons demonstrate that the proposed method offers high precision and low calibration cost, thereby improving the calibration accuracy of the target. The proposed method provides a reference algorithm for the ground field calibration of the next generation of high-resolution mapping satellites in China.
KeywordsCalibration Pointing angle error Geometric center method Centroid method Mixed centroid method
Conflict of Interest
The authors declare that they have no conflict of interest.
All authors have participated in approval of the final version.
This manuscript has not been submitted to, nor is under review at, another journal or other publishing venue.
This work is supported in part by the National Nature Science Foundation of China under Grant No. 61571345, Yangtze River Scholar Bonus Schemes and Ten Thousand Talent Program.
Compliance with Ethical Standards
All authors have participated in (a) conception and design, or analysis and interpretation of the data, and (b) drafting the article or revising it critically for important intellectual content.
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