基于姿态关联帧叠加的星图信噪比增强方法  

An Image Signal-to-Noise Ratio Enhancement Method Based on Attitude Correlated Frames Adding

作　　者：戴东凯 吴州平 谭文锋 王省书[1] 倪源蔓 DAI Dongkai;WU Zhouping;TAN Wenfeng;WANG Xingshu;NI Yuanman(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha,Hunan 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073

出　　处：《中国惯性技术学报》2020年第1期82-88,共7页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金(61803378)。

摘　　要：星敏感器在近地面使用时,由于星光信号容易被强烈的天空背景噪声所淹没,导致其无法在白天正常工作。为了提高星敏感器白天探星的能力,提出了一种星敏感器动态条件下基于姿态关联叠加提高星图信噪比的方法。该方法利用陀螺仪测量出与参考帧相关的每个星图帧之间的姿态变化量,实现不同帧星图之间的平移和旋转变换(即相关变换)。最后,将相关帧星图叠加到一起,使星图信噪比得到√n倍增长(n为关联星图的帧数),从而提高全天时星敏感器在白昼条件下的工作能力。仿真结果表明:该方法能够有效地提高星图信噪比,且受惯性器件误差和安装角误差的影响较小,具有较强的可行性。Since the stellar light signal is easily overwhelmed by the noise induced by strong sky background,the star tracker cannot work properly in the daytime.In order to improve the star detection ability of star trackers,an image signal-to-noise ratio(SNR)enhancement method based on attitude correlated frames adding under the dynamic condition for star tracker is proposed.The method uses the gyroscopes to measure the attitude changes of each image frame related to the reference frame.And the translation and rotation transformations(namely correlated transformation)between different frame star images are conducted.Finally,the correlated frames are added together,so that the SNR of the star image increased by√n times(n is the number of frames of the associated star image),and the working ability of daytime star tracker in the daytime is improved.The simulation results show that the proposed method can effectively enhance the SNR of the star images,and is less affected by the error of the inertial sensors and installation angles,so the feasibility is proved.

关 键 词：星敏感器 姿态关联帧 信噪比 陀螺仪 

分 类 号：V241.6[航空宇航科学与技术—飞行器设计]