摘要
星敏感器是一种高精度姿态测量设备,被广泛应用于航天、航空、舰船等领域,其性能主要取决于内参数的标定精度。选用何种标定方法完成内参数的标定以及如何提高内参数的标定精度是星敏感器实现高精度姿态测量的关键。针对现有的依赖姿态解算的标定方法与不依赖姿态解算的标定方法进行了相应研究,通过采用网格状星图分析了两类标定方法的噪声特性,同时对比研究了两类标定方法在不同星点数目、不同星点分布下的标定情况。仿真结果表明:星点数目越多内参数的标定精度越高,星点分布越均匀内参数的标定精度越高,且在同等情况下依赖姿态解算的标定方法的精度要优于不依赖姿态解算的标定方法。
Star sensor is a high-precision attitude measuring device, which is widely used in aerospace, aviation, ship and other fields. Its performance depends mainly on the calibration accuracy of internal parameters. Therefore, how to choose the calibration method to complete the calibration of internal parameters and how to improve the calibration accu racy of internal parameters is the key of star sensor to achieve high-precision attitude measurement. The calibration methods based on attitude solution or not are researched in this paper. The noise characteristics of the two calibration methods are analyzed by using a grid star map, and the two calibration methods under different star number and differ- ent star distribution are compared. The simulation results show that the more the number of star points, the higher the calibration accuracy of the internal parameters, the more uniform distribution of star pointis, the higher the calibration accuracy of the internal parametersis. In the same case, the accuracy of the calibration method depending on attitude calculation is better than that of not depending on attitude calculation.
出处
《光学与光电技术》
2017年第6期77-83,共7页
Optics & Optoelectronic Technology
基金
国家自然科学基金(61573368)资助项目
关键词
星敏感器
标定
成像模型
噪声特性
星点分布
star sensor
calibration
imaging model
noise characteristics
star distribution
