低纬子午环应有的观测精度

Ideal Observation Precision of the LLMC

本文介绍了在拟定总体设计方案时针对实际需要与可能提出的基本要求 ;对各种误差的测定方法与传统子午环作了比较 ,并且列出了低纬子午环新增加的仪器误差 ;文章根据在仪器较稳定条件下各种误差的测定精度 ,对该仪器的应有观测精度作了估计 ,指出每颗天体位置的单次测定精度不应低于± 0 .1 0″,最后还分析了目前尚未达到应有精度的原因。

Basic requirements to reach the ideal observation precision are introduced in this paper.The method used for the error measurement is compared in this instrument with those of in traditional meridian circles,and new instrumental errors of the LLMC are found out.In order to determine the precision of all kinds of errors under the condition that the instrument is stable,the ideal observation precision of the instrument is estimated.It is pointed out that the precision of a single determination for each celestial body should be less than ±0.10″.Finally the reasons for not reaching to the ideal precision are analyzed.