为了获得高精度的时间信息, 常采用GPS等授时系统进行授时, 但在野外等复杂环境下往往接收不到GPS等授时信息。数字天顶仪是一种高精度的天文定位仪器, 采用数字天顶仪进行时间标定的研究相对较少。考虑到数字天顶仪的定位结果受恒星视位置和时间的影响, 首先分别研究了时间误差及星表精度对恒星视位置的影响, 然后分析了恒星视位置对数字天顶仪定位精度的影响。基于数字天顶仪的定位原理提出了一种时间标定的新方法, 并得出时间标定的精度在0.025 s。实验数据的分析结果表明该时间标定的方法是可行的。

In order to get accurate time information, the GPS was always used. But GPS can not be used in outdoors due to the complicated environment. Digital zenith camera is a kind of high-precision astronomical positioning instrument. The study about time calibration based on digital zenith camera was rather little. Considering that the orientation result can be influenced by star apparent position and time. Firstly, the influence of time error and star catalogue on star apparent position was analyzed respectively. Then, the influence of star apparent position on the orientation result was analyzed. One new method of time calibration based on digital zenith camera was proposed. The precision of time calibration was 0.025 s. The analysis of experimental data shows that the time calibration method is feasibility.