基于P向量与三角形内切圆的星图识别算法

为了减少导航星表的存储容量和提高星图识别的成功率,提出了一种将P向量与三角形内切圆相结合的快速全天自主星图识别算法.该算法在构造导航星表过程中,从天文星表中挑选出满足要求的导航星并对其编号,以构造的P向量值、导航三角形内切圆半径R及导航三角形的第三条边为特征量构造导航子星表;在识别过程中,找出一定误差门限内,满足P向量...

Star identification algorithm based on P vector and triangle incircle

To decrease the storage capacity of guide star catalogue and increase the success rate of star identification,a fast all-sky autonomous star identification algorithm based on P vector and triangle incircle is proposed.When the guide star catalogue is constructed,the guide star is selected from astronomical durchmusterung and numbered.The guide star sub-catalogue is constructed by P eigenvalue,the guide triangle incircle radius R and the third angular distance of guide triangle.When the star map is identified,the guide star order number of guide triangle is found,which can satisfy the P vector value and guide triangle incircle radius R in some range of error.The star order number is used for star identifying,which is corresponding with the third angular distance of observation triangle.The simulation results show that the proposed algorithm has better robustness for position error and magnitude error.When the Gauss noise of position error is 2 pixels,the identification rate is greater than 97.8% and the average identification time is 14.06 ms.