X/Ka双频低温接收前端设计

Design of X / Ka dual-band cryogenic receiving front-end

低温接收机是深空探测地面应用系统的重要组成部分,深空测控距离遥远,需要挖掘一切潜力提高地面设备的接收能力。带圆极化网络制冷技术对改善深空系统接收品质因素G/T作用明显。提出了圆极化网络制冷的X/Ka双频低温接收前端设计的若干关键技术,并给出样品研制测试结果。测试结果表明,X频段低温接收前端噪声温度小于20K,Ka频段低温接收前端噪声温度小于30K。

Cryogenic receiver is a significant part of ground utility system for deep space control system and we need to optimize the ground-based facilities to improve the receiving performance as the distance of the control system is very long. Refrigeration technology with circularly polarized network has great effect on the reception quality factor G / T of deep space systems. This paper proposed some key techniques for designing of X / Ka dual-band receiving front-end with circularly polarized network,and the measurement results were given. The measured results show that the noise temperature of the former system of X and Ka band is less than 20 K and 30 K respectively.