德令哈13.7m望远镜多波束接收机的运行

Operation of Multibeam Receiver of Delingha 13.7m Telescope

德令哈13.7 m望远镜是中国最重要的射电望远镜之一.望远镜自安装超导成像频谱仪以及采用飞行观测模式以来,运行近10 yr.在此期间,望远镜开展并完成大量的天文观测,累积了巨量的天文数据,取得了一系列重要的科研成果.介绍了超导成像频谱仪在天文观测中的运行状态,运行中疑难问题、故障现象及解决方案.详述了超导成像频谱仪各方面性能测试及多年来的性能分析,包含接收机噪声温度及望远镜系统噪声温度、镜像抑制比、接收机稳定性、波束性能等方面.列举了超导成像频谱仪更新发展方面的工作,包含本振功率自动化调整、边带分离型超导混频器预放大电路的更新、控制程序的优化等.总结经验和规律,承前启后,将过去的超导成像频谱仪的维护运行经验应用到之后新一代大规模接收机系统中.

Delingha 13.7 m telescope is one of the most important radio telescopes in China.Since installing superconducting spectroscopic array receiver(SSAR)and adopting On The Fly(OTF)observation mode,the telescope has operated for nearly 10 years.During this period,a large number of astronomical observation projects have been carried out and completed,a large amount of astronomical data has been observed,and a series of important scientific research results have been achieved.This paper introduces the operation status of SSAR in astronomical observation,the problems in operation,the phenomena of faults and solutions.The performance test and performance analysis of SSAR are described in detail,including receiver noise temperature and telescope system noise temperature,image rejection ratio(IRR),receiver stability,beam performance and so on.The update and development of SSAR is listed,including the automatic adjustment of LO(Local Oscillator)power,the updating of pre-amplification circuit of sideband separation superconducting mixer,and the optimization of control program,etc.This paper summarizes the experience and rules,and connects the past with the future,and applies the experience of maintenance and operation of SSAR to the next generation of large-scale receiver system.