整体平差方法在CCD天体测量中的应用

Progress of the Block Adjustment of Overlapping Plates in CCD Astrometry

回顾了基于底片重叠观测的整体平差方法的发展历史和应用概况,分析了该方法应用于底片资料处理没有取得预期效果的原因,介绍了小视场CCD重叠观测的整体平差研究进展。分析与实测资料归算表明,整体平差方法可以在CCD资料处理中充分发挥作用,在保证长焦距、小底片比例尺的同时,通过对CCD重叠观测的整体平差(相当于扩大观测视场),可覆盖更多的参考星, 进而达到改善局部参考架、提高归算结果精度的目的。

The history and application of the block adjustment (BA) in the reduction of overlapping photographic plates are reviewed in this paper. The reasons that the anticipated results have not been obtained by this method are analyzed. The new progress in the BA of overlapping CCD frames with small field of view is introduced. Investigation and reduction of CCD frames show that BA can play an important role in the reduction of overlapping CCD frames. In the case of long focal length of telescope and small plate scale, the BA of overlapping CCD frames can enlarge the field of view, cover more reference stars, and consequently improve the local reference frame and the precision of reduction results.