摘要
精确的成像模型是星敏感器高精度姿态测量的关键,尤其是成像模型中镜头畸变模型的选择。根据几何推断的最大信息量准则,对不同的镜头畸变模型在不同星点位置的噪声水平以及不同畸变系数情况进行了仿真比较,并通过实验进行了验证。实验结果与仿真分析结果一致,结果表明:在镜头畸变系数小于2e-5且星点位置噪声水平小于0.5像素时,采用一阶径向畸变模型即可;当镜头畸变系数大于2e-5或星点位置噪声水平大于0.5像素时,可采用3参数的一阶径向畸变加一阶切向畸变,更多参数及更高阶模型的优势并不明显。
Precise imaging model plays an important role in altitude measurement of star sensor,especially the selection of lens distortion model for imaging model.According to the maximal quantity of information criterion in geometric inference,various lens distortion models were simulated and compared under different noise level of star location and distortion coefficient of lens.And the simulation results were verified by experiment.The simulation analysis and experiment result coincided well with each other,which shows that： the first order radial distortion model is suitable,when distortion coefficient of lens is less than 2e-5 and noise level of star location is less than 0.5 pixels.While for distortion coefficient of lens greater than 2e-5 or noise level of star location greater than 0.5 pixels,3-parameter first order radial distortion model together with the first order tangential distortion model is suitable.More parameters or higher order models do not show obvious advantages.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第3期665-670,共6页
Infrared and Laser Engineering
基金
长江学者和创新团队发展计划(IRT0705)
国家自然科学基金(61008032)
关键词
星敏感器
模型选择
镜头畸变
star sensor
model selection
lens distortion
