New method for in-flight calibration of camera's intersection angle
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摘要: 提出了一种新的在轨标定相机交会角的方法,该方法不同于目前广泛采用的摄影测量中的后方交会。以三线阵CCD测绘相机为例,通过对其工作原理的分析,建立了求解相机交会角的几何模型,并利用天绘卫星三线阵影像数据进行了相关试验。结果表明,该方法可行,计算结果精度较高,与摄影测量方法所得结果非常接近。同时,计算分析了定轨精度和地面控制点精度对相机交会角精度的影响。相对于摄影测量的方法而言,该方法理论简单,易于理解,可进一步应用于高分辨相机和多光谱相机离轴角的在轨标定,具有重要意义。Abstract: A new method for the in-flight calibration of camera's intersection angle was put forward. It is different from the photogrammetric resection which is widely used at present. Take the three-line-array CCD surveying and mapping camera as example, through the analysis of its working principle, the geometric model to calculate the camera's intersection angle was established, and the correlative experiment using the image data of TH satellite was carried out. Result shows that this method is feasible, and the outcome is very close to the conclusion got by the photogrammetric method. Meanwhile, the affection of the orbit determination precision and the ground control points' precision on the camera's intersection angle was calculated and analyzed. Compared with the photogrammetric method, it is easier to understand, and can further be used to calibrate the off-axis angle of the multispectral camera and high definition camera in-flight. It is of great significance.
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Key words:
- three-line-array CCD camera /
- camera intersection angle /
- geometric model /
- TH satellite
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