K波段微波辐射计中频接收机的影响研究  

Impact research on the intermediate frequency receiver of K-band microwave radiometer

作　　者：谢衍[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电子测量技术》2013年第5期119-122,共4页Electronic Measurement Technology

摘　　要：设计了一种用于K波段微波辐射计的零中频接收机结构。然后针对此中频接收机结构,进行非理想条件下K波段微波辐射计中频接收机的影响研究和指标分析。研究的主要内容为中频接收机关键指标(包括噪声温度、增益起伏、本振泄漏和本振频率飘移)对K波段微波辐射计灵敏度和绝对精度影响的定量分析。最后对中频接收机的增益起伏进行实际测量,证明零中频结构的中频接收机能够在一定程度上改善K波段微波辐射计的技术指标。This paper designs the intermediate frequency receiver architecture of zero intermediate frequency for K-band microwave radiometer. In accordance with the architecture of intermediate frequency receiver, this paper analyses the impact of intermediate frequency receiver on K-band microwave radiometer under non-ideal conditions. The main research is the quantitative influence of key indicators of intermediate frequency receiver （including noise temperature, gain fluctuation,the local oscillator leakage and the local oscillator frequency drift） on the sensitivity and absolute accuracy of K-band microwave radiometer. Finally, the actual measurements of the gain fluctuation of intermediate frequency receiver are proved to be able to improve the technical specifications of the K-band microwave radiometer.

关 键 词：微波辐射计 中频接收机 增益起伏 

分 类 号：TP732.1[自动化与计算机技术—检测技术与自动化装置]