摘要
深空探测器通信距离遥远,其返回信号微弱,因此要求接收天线具备尽量高的品质因数(G/T)。下行链路设备工作在低温环境中,有利于降低噪声温度,提高系统G/T值。针对35 m深空测控天线,首先分析了Ka频段天线增益、外部和内部噪声;在此基础上提出了Ka频段馈源整体制冷方案,并对馈源不制冷和馈源整体制冷两种方案进行了比对分析;最后总结了超低温馈源设计和制造关键技术。馈源整体制冷系统噪声温度测试结果小于45 K。分析表明采用馈源整体制冷方案能够提升系统G/T值1.03dB,35 m深空测控天线Ka频段接收能力提高约21%。
On account of the long distance,large signal loss and weak received signal,the system G/T value of deep space telemetry,tracking and control（TT＆ C） receiving antenna is required to be as high as possi-ble. It is beneficial to reduce the system noise temperature and improve the system G/T value when the re-ceiving device works in low-temperature environment. In this paper,the Ka-band gain,external and inter-nal noise of 35 m diameter deep space TT＆C antenna are analyzed,a scheme of Ka-band integral feed re-frigeration is proposed,the key technologies of designing and manufacturing u ltra - low temperature feed are summarized,and the schemes of no-refrigeration feed and integrated refrigeration feed are compared. Test results show that the noise temperature of integrated refrigeration feed system is less than 45 K. Analysis results show that the application of integrated refrigeration technique enhances the G/T value by 1.03 dB and the reception capacity of 35 m diameter Ka-band deep space antenna is increased by about 21 %.
出处
《电讯技术》
北大核心
2017年第5期603-607,共5页
Telecommunication Engineering
关键词
深空测控
接收天线
馈源制冷
超低温
KA频段
deep space TT＆C
receiving antenna
feed refrigeration
u ltra - low temperature
Ka-band
