射电日像仪灵敏度测量

Measurements of the Sensitivities of the MUSER

灵敏度是射电望远镜的一个重要性能指标,它反映了望远镜监测弱信号的能力。基于明安图射电频谱日像仪(Mingantu Ultrawide Spectral Radioheliograph,MUSER)的调试观测,给出了日像仪灵敏度的测量方法,对天线系统以及整个阵列的灵敏度进行测量分析,得到了日像仪系统整体的灵敏度性能参数。测量同时给出了天线系统的效率以及接收机系统的增益,这将为下一步日像仪展开常规的科学观测提供参考。

For a radio telescope its sensitivity is an important parameter showing the capability of the telescope in detecting weak radio emission. In this paper we propose a measurement method of the sensitivities for the MUSER. Based on our analysis of measurements and subsequent calculations, the sensitivity parameter values of single antenna systems and the entire antenna array of the MUSER are obtained, so are the antenna efficiency values and system gain-factor values. The results can significantly support future scientific observation with the MUSER.