摘要
介绍了建立上海天文台天马65 m射电望远镜(简称TM65 m)指向模型的过程.采用"十字扫描"的方法对单点数据进行采集,采用带有高斯项和非线性项的曲线模型进行偏差拟合,并对单点扫描过程中源角径导致的波束展宽量进行了仿真分析,通过使用射电源预报来提高建立模型的效率.用最小二乘法对全天区数据进行拟合,得出了8个天线参数的指向模型,并在实际中验证,最后建立了TM65 m望远镜X波段指向模型.盲指误差达到12.36角秒,满足了X波段及以下波段的指向要求.
A new method is described to establish the pointing model of the 65-meter Radio Telescope of Shanghai Astronomical Observatory （TM65 m）. The prediction of source orbit is used to improve efficiency. The single pointing error is collected via ＂cross scan＂, and the model is fitted with both the Gaussian and nonlinear terms. It is also simulated and analyzed how the beam is expanded after scan because of the angular size of a source. An eight parameter pointing model is built after fitting all collected errors. The model is applied and has been proved to work well in X band and other bands with lower frequencies. The final pointing accuracy in X band is 12.36 areseconds.
出处
《天文学报》
CSCD
北大核心
2015年第2期165-177,共13页
Acta Astronomica Sinica
基金
国家自然科学基金项目(11303076)资助
