CAJ | 학술논문

报告了上海天马65 m射电望远镜(简称TM65m)4个低频(L、S、C、X)段的天线效率、灵敏度以及系统噪声温度的性能测试情况。首先介绍了射电天文接收系统的关键指标，接着对测试方法进行了论述，并对误差进行了评估。最后给出了TM65m上4个低频段的天线效率、灵敏度以及系统噪声温度的测试情况，测试结果表明：在C和X波段，副面位置固定时，在高低俯仰角上效率和灵敏度下降剧烈，当启动副面(随动)模型后，在全仰角范围内，效率可以控制到60%以上。系统噪声温度与副面模型无关，在4个波段中C波段的灵敏度和系统噪声温度最佳。
보고료상해천마65 m사전망원경(간칭TM65m)4개저빈(L、S、C、X)단적천선효솔、령민도이급계통조성온도적성능측시정황。수선개소료사전천문접수계통적관건지표，접착대측시방법진행료논술，병대오차진행료평고。최후급출료TM65m상4개저빈단적천선효솔、령민도이급계통조성온도적측시정황，측시결과표명：재C화X파단，부면위치고정시，재고저부앙각상효솔화령민도하강극렬，당계동부면(수동)모형후，재전앙각범위내，효솔가이공제도60%이상。계통조성온도여부면모형무관，재4개파단중C파단적령민도화계통조성온도최가。
The measured results of the antenna e?ciency, sensitivity, and system noise temperature for TM65m telescope are reported in this paper. The key param-eters describing a radio astronomy receiving system are introduced firstly. Then the measurement methods are discussed, and the errors are assessed. Finally, the measure-ments of the antenna e?ciency, sensitivity, and system temperature performances are given. The results show that the e?ciency and SEFD (System Equivalent Flux Den-sity) decrease dramatically at both low and high elevations when the position of the sub-reflector is fixed. The antenna e?ciency in C and X bands reaches more than 60%over the entire elevation range if a sub-reflector model is applied. The system noise temperatures are independent of the sub-reflector model. The sensitivity and system noise temperature of the C band has the best performance among the four bands.