D波段直接检波辐射计研制

Development of D-band direct detection radiometer

微波辐射计是利用被动接收来自的大气辐射的微波信号转换获取物体的辐射亮温的微波遥感设备,文中通过天馈网络和太赫兹接收机等关键技术设计了一种D波段太赫兹辐射计。辐射计由卡塞格伦天线和D波段直接检波接收机组成,整机实现了全国产化。在148GHz~152GHz频率范围内,辐射计噪声系数小于4.5dB,线性度都达到0.9999,灵敏度达到0.1K(@积分时间20ms),整机功耗小于2.8W。D波段双极化辐射计是微波成像探测仪的重要组成部分,可以用于对大气窗口参数的观测。

The microwave radiometer is a microwave remote sensing device that uses passive reception of microwave signals from atmospheric radiation to convert the radiant temperature of an object,and a D-band terahertz radiometer is designed in the paper through the key technologies of antenna feeder network and terahertz receiver.The radiometer is composed of a Cassegrain antenna and a D-band direct detection receiver,and the whole machine is fully localised.In the frequency range,the noise figure of the radiometer is less than 4.5dB,the linearity reaches 0.9999,the sensitivity reaches 0.1K(@integration time 20ms),and the power consumption of the whole machine is less than 2.8W.The D-band dual-polarisation radiometer is an important part of the microwave imaging detector,and it can be used for observing the parameters of the atmospheric window.