动态拖尾星图模拟算法研究  

An Approach of Star Image Simulation for Strapdown Star Sensor

作　　者：鹿瑞[1] 武延鹏[1] 

机构地区：[1]北京控制工程研究所,北京100190

出　　处：《空间控制技术与应用》2016年第4期57-62,共6页Aerospace Control and Application

摘　　要：星图模拟技术是星图识别算法仿真和性能测试的基础.为了更好地模拟星敏感器在轨工作的情况,对星敏感器的软件开发以及自身性能进行有效的地面测试,提出一种动态拖尾星图模拟算法.该算法分为4个步骤:首先根据星敏感器指向在全天球范围内搜索导航星;接着利用小孔成像模型计算导航星在星敏感器成像面的投影位置;然后在考虑卫星运动引起的恒星拖尾的基础上,按照二维灰度分布规律置灰度值来模拟星像点像素;最后叠加杂散光背景及成像器件引起的噪声.提出的算法具有速度快、精度高及可实现性高等优点.The technique of the star map simulation is widely used to test star identification algorithms and the performance of star sensor on the ground. A novel approach of star map simulation is put forward in this paper, considering satellite orbit motion and effect of image shift. The simulation procedure con- sists of four steps： firstly, searching the navigator stars that appearing in the field of view throughout the whole sky. Dividing index method is proposed to accelerate the selecting velocity. Secondly, the accurate positions of selected guide stars on the image plane of star sensor are derived by constructing a pinhole model. Thirdly, gray values for simulating star image pixels are evaluated according to the 2D Gaussian distribution law. In order to simulate the star image accurately and actually, the image shift should be considered. Finally, noises made by stray light and circuits are added in order to simulate the orbit envi- ronment vividly. In a world, the approach proposed here is with the merit of high speed, nice accuracy, and good reality and so on.

关 键 词：星敏感器 星图模拟 卫星轨道运动 像移 

分 类 号：V448[航空宇航科学与技术—飞行器设计]