Jiang Jie, Xiong Kun, Yu Wenbo, Yan Jinyun, Zhang Guangjun
Opt Express. 2016 Dec 26;24(26):29830-29842. doi: 10.1364/OE.24.029830.
A star sensor provides high-precision attitude information by capturing a stellar image; however, the traditional star sensor has poor dynamic performance, which is attributed to its low sensitivity. Regarding the intensified star sensor, the image intensifier is utilized to improve the sensitivity, thereby further improving the dynamic performance of the star sensor. However, the introduction of image intensifier results in star centroiding accuracy decrease, further influencing the attitude measurement precision of the star sensor. A star centroiding error compensation method for intensified star sensors is proposed in this paper to reduce the influences. First, the imaging model of the intensified detector, which includes the deformation parameter of the optical fiber panel, is established based on the orthographic projection through the analysis of errors introduced by the image intensifier. Thereafter, the position errors at the target points based on the model are obtained by using the Levenberg-Marquardt (LM) optimization method. Last, the nearest trigonometric interpolation method is presented to compensate for the arbitrary centroiding error of the image plane. Laboratory calibration result and night sky experiment result show that the compensation method effectively eliminates the error introduced by the image intensifier, thus remarkably improving the precision of the intensified star sensors.
星敏感器通过捕获恒星图像来提供高精度姿态信息；然而，传统星敏感器动态性能较差，这归因于其灵敏度较低。对于增强型星敏感器，利用图像增强器来提高灵敏度，从而进一步改善星敏感器的动态性能。然而，图像增强器的引入导致星点质心定位精度下降，进而影响星敏感器的姿态测量精度。本文提出一种用于增强型星敏感器的星点质心定位误差补偿方法，以减少这些影响。首先，通过分析图像增强器引入的误差，基于正投影建立包含光纤面板变形参数的增强型探测器成像模型。此后，使用列文伯格-马夸尔特（LM）优化方法获得基于该模型的目标点位置误差。最后，提出最近三角插值方法来补偿图像平面的任意质心定位误差。实验室标定结果和夜空实验结果表明，该补偿方法有效消除了图像增强器引入的误差，从而显著提高了增强型星敏感器的精度。
