研究目的
To propose a mixed centroid method for calculating the laser footprint center to improve the calibration accuracy of spaceborne laser altimeters.
研究成果
The mixed centroid method is better than the traditional calibration methods under different conditions of false alarm rate and missed alarm rate. It requires fewer detectors and achieves small pointing angle error, making it suitable for the calibration of the next generation of high-resolution mapping satellites in China.
研究不足
The study is limited to simulation experiments and does not include real-world testing. The effectiveness of the mixed centroid method may vary with different laser altimeter designs and ground conditions.
1：Experimental Design and Method Selection:
The study proposes a mixed centroid method for calculating the laser footprint center, which involves calculating the geometric center of each energy level band, eliminating abnormal points, inverting the laser energy level distribution, and correcting the true footprint.
2：Sample Selection and Data Sources:
The simulation experiment uses a laser ground footprint as a circle with a spot radius of 15 m, and the spacing of the ground laser detector is set from 1 to 20 m increasing by 1 m.
3：List of Experimental Equipment and Materials:
Ground laser detector array is used to detect the energy distribution of the laser footprint.
4：Experimental Procedures and Operational Workflow:
The mixed centroid method is compared with the traditional geometric center method and the centroid method under different conditions of false alarm rate and missed alarm rate.
5：Data Analysis Methods:
The pointing angle error is used as an indicator to evaluate the performance of the algorithms.
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