应用有限冲击响应滤波器消除星敏感器星像噪声  

Elimination of noises of star locations in star images based on FIR filter

作　　者：王新升[1] 李葆华[2] 郑靖[3] 

机构地区：[1]北京航空航天大学宇航学院,北京100191 [2]哈尔滨工业大学空间控制与惯性技术研究中心,黑龙江哈尔滨150001 [3]哈尔滨工业大学控制科学与工程系,黑龙江哈尔滨150001

出　　处：《光学精密工程》2010年第6期1381-1386,共6页Optics and Precision Engineering

基　　金：国家863高技术研究发展计划资助项目(No.2007AA704340;No.2007AA704115)

摘　　要：从图像处理的角度研究了提高星像坐标定位精度的方法。分析了星像噪声产生的原因,对去噪声前的星像坐标进行了频谱特性分析,根据分析结果,提出了一种基于Parks-McClellan算法的滤波器最优设计方法来设计有限冲击响应滤波器(FIR滤波器)。分析了通过该FIR滤波器后星像坐标的功率谱曲线。结果显示,该FIR滤波器能很好地消除星像噪声。最后,采用某型号卫星星敏感器原理样机的地面观星数据进行实验验证,结果表明,星敏感器输出姿态精度由原来的21.921″提高到了7.823″。A method to improve the accuracy of star locations in star images is presented based on image processing.The reasons for generating noises in star locations are researched,and a frequency spectrum of a star location before denoising is analyzed.Based on the analyzed results,a Finite Impulse Response （FIR） filter is designed and realized based on the Parks-McClellan algorithm.Finally,the spectra of the star locations obtained from the star images are analyzed with the FIR filter,and the results show that the FIR filter could eliminate the noises of star locations well.The algorithm is successfully demonstrated by real space experiment data captured by a star sensor in a satellite.The experimental results show that the accuracy of attitude has improved to 7.823″ from 21.921″.

关 键 词：星敏感器 星像坐标精度 FIR滤波器 星像质心 除噪 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]