1.2m望远镜卫星跟踪定位精度的实测与分析

Observation and Analysis of the Accuracy of Tracking and Pointing for Satellite Using 1.2m Telescope

用 1 .2m地平式望远镜加装的视频CCD、计算机图象数据采集卡及其运用数据处理软件 ,对 2 0 0 0年 4月 1 7日观测视角速度比较快的激光卫星Topex进行了实测及结果分析。每组资料数据为 1 0帧图象 ,在当天晚上的跟踪观测过程中取得 3 2组数据 ,用一个二次多项式进行拟合处理后的结果 ,再把计时误差引起的定位误差分离出来 ,余下为 1 .4″误差视为望远镜的跟踪定位精度。为了提高跟踪定位精度 ,我们认为主要解决CCD计时误差即可。

The observation and data analysis of the Topex satellite on April 17,2000 are given in this paper. The observational data from a Video CCD installed on the 1.2m telescope is disposed using collecting and processing software for the video images. A group of independent data is composed of 10 images and 32 groups are observed. The influence of the timing effects in the results with a 2th order least squares polynomial is separated and finally the accuracy of the telescope tracking and pointing is 2 arcsec. It is shown that the influence of the timing effects is an important factor.