三角形内切圆的星图识别算法  

Star pattern identification algorithm by triangle incircle

作　　者：陆敬辉[1] 王宏力[1] 孙渊[1] 崔祥祥[1] 

机构地区：[1]第二炮兵工程学院,陕西西安710025

出　　处：《红外与激光工程》2011年第4期752-756,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(60874093)

摘　　要：在三角形三条边长之比及其内切圆半径已知的情况下可以确定唯一的三角形,由此提出了一种基于三角形内切圆的星图识别算法。构建了导航星表,每个导航三角形按照导航星之间的角距升序来存储,构造了能够反映导航三角形三边之间关系的特征量T为索引,存储三角形内切圆半径R为识别量;在星图识别过程中,利用特征量T进行搜索、三角形内切圆半径R进行识别,若识别结果不唯一,则进一步采用三角形角距的方法进行识别。仿真结果表明:该方法对位置误差和星等误差均有较好的鲁棒性;当存在2像元的位置噪声时,识别成功率大于97.48%,平均识别时间为22.64 ms。Based on the fact that any triangle is determined by its side ratio and incircle radius,a new star pattern identification algorithm was proposed.In this algorithm,guide star catalogue was constructed,every guide star triangle was stored according to the angular distance among guide stars,a variable T that describes the relation of the three sides of guide star triangle was constructed and indexed,the triangle incircle radius was also stored for identification.In the process of star pattern identification,the variable was used for indexing and the triangle incircle radius was used for identifying.If there was more than one identification result,the triangle distance algorithm was used.The simulation results show that the proposed algorithm has better robustness for position and magnitude error,when the Gauss noise of position error is two pixels,the identification rate is greater than 97.48% and the average identification time is 22.64 ms.

关 键 词：星图识别 三角形内切圆 星敏感器 导航星表 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计] TP391.4[自动化与计算机技术—计算机应用技术]