基于共有星的快速星图识别方法

Fast star identification method based on common star

提高星图识别的快速性对于提高数字天顶仪的定位效率具有重要意义。传统的数字天顶仪星图识别需要对旋转拍摄的每幅星图上所有星点单独进行识别,致使星图识别效率较低。考虑到星图间存在着共有星,对此提出了一种基于共有星的星图识别方法。首先对定位循环中间位置拍摄的两幅星图单独进行识别,然后通过建立倾斜修正模型消除了实际拍摄状态下CCD平面与水平面之间的小倾角,并在此基础上建立了星点归算模型,以此找出剩余星图与已识别星图间的共有星。实验结果表明:通过星点归算模型找出剩余星图与已识别星图间共有星后,再对新增星进行识别,大大提高了星图识别的效率。

Improving the rapidity of star identification is of great importance for improving the positioning efficiency of digital zenith camera. The traditional star identification needs to identify all the star points on each star image taken by rotation,which results in the low efficiency of star identification. Considering the existence of a common star between the star maps,a star identification method based on common stars was proposed. First,the two star images in the mid-dle position of Positioning cycle were identified. Then, by setting up the tilt correction model, the small tilt between the CCD plane and the horizontal plane was eliminated. On the basis of tilt correction model, the Star reduction model was established, which found out the common stars between the residual star maps and the recognized star map. The exper-imental results showed that： The efficiency of star map recognition was greatly improved by identifying newly added stars alone.