数字天顶摄影仪中星象匹配识别与匹配星表编制

摘要

在利用数字天顶摄影仪通过天文测量确定重力垂线偏差的工作中，需要建立高精度高密度的恒星星表，实现CCD观测星象与星表中恒星匹配识别。本文提出了一种新的控制三角形匹配算法，利用CCD影像平面中星象与天顶切平面中恒星的三角形角、三角形边长及星等信息作为判定条件，快速准确实现CCD影像平面中星象与切平面中恒星的控制星和参考星识别匹配。根据数字天顶摄影仪CCD星象观测能力，通过对 Hipparcos、Tycho-2星表处理，分别编制了数字天顶摄影仪控制星和参考星匹配星表数据库。0．3s内完成一幅3073×2048大小的CCD实测图像星象准确匹配识别。%Based on astrogeodedic theory ,the digital zenith camera ,which integrated techniques such as GPS and CCD ,can precisely measure deflections of the vertical .A new control triangle matching algorithm ,which can subsequently recognize and match control stars and reference stars with target stars in the CCD image plane and the tangent plane ,has been proposed .The digital zenith camera matching star catalogue data base has been estab-lished via processing the star catalogue such as Hipparcos and Tycho-2 .The calculation of recognize and match control stars and reference stars of a CCD image (3073 × 2048) can be finished with in 0 .3s automatically .