摘要
介绍了70～700 MHz低频太阳射电频谱仪的科学目标和技术方案,给出了11 m网状抛物面天线、接收系统、数字频谱终端的技术指标。并对系统的整机噪声系数、灵敏度、最小可测流量密度、LNA输入端的噪声功率进行了估计。系统频谱分辨率优于0.2MHz,时间分辨率最高可达2 ms。
In this paper,we describe the scientific objectives and technical design of a new solar radio spectrometer working in the frequency range from 70 to 700 MHz（meter wave range）.We also give the parameters of an 11-meter mesh antenna,a receiver system,and a digital spectrometer.We subsequently estimate the system noise coefficients,sensitivities,lowest observable flux densities,and input noise powers before the LNA（Low Noise Amplifier）.The spectral resolution of this spectrometer is better than 0.2 MHz and the time resolution is 2 ms.
出处
《天文研究与技术》
CSCD
2011年第3期229-235,共7页
Astronomical Research & Technology
基金
国家自然科学基金(10978006)资助
关键词
米波太阳射电频谱仪
接收机
噪声系数
灵敏度
Meter-wave spectrometer for solar observation
Receiver
System noise coefficient
Sensitivity
