机载噪声耦合式增益自动补偿微波辐射计  

Study of Noise Coupled Digital Auto-Gain Compensative Microwave Radiometer

作　　者：孙鸿雁[1] 赵凯[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所

出　　处：《北京邮电大学学报》2007年第5期100-104,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(40275002)

摘　　要：通过2个耦合器将固态噪声源信号分别馈入到接收信号和射频开关端口，辐射计可在较大范围内动态探测到被测目标小量微波辐射信号变化．利用增益波动自动补偿技术，提高了设备的长期稳定性和灵敏度，较好地解决了辐射计在环境温度剧烈变化下系统的稳定性问题，实现了机载条件下对云中过冷水的探测．测试结果表明，辐射计灵敏度范围在0．14～0．18K，主要技术指标能够满足测量要求，与地面雷达和其他航空遥感仪器相比，在直接测量的局部区域具有准确性高、取样代表性好的特点．The observation of extremely low radiation brightness temperature signal of atmospheric objectives with airborne radiometer is critical to the service of artificial rainfall and collection of meteorological data. A new airborne noise coupled digital auto-gain compensative microwave radiometer （NDMR） was designed. Using compensative technique automatically, the stability and sensitivity of such system was improved greatly. The noise signal was input into the antenna and reference source through two couplers respectively, so the instrument can detect the slight variation in the micro-wave signal in cloud within relatively wide dynamic range. The results show that NDMR was reliable for the atmospheric observation on airborne platform under the circumstance of super-cooled water. Compared to the ground-based weather radar, the instrument gained more accurate data and detected local region directly, so it enhance the detection accuracy and sampling representative.

关 键 词：噪声耦合 数字增益控制 机载微波辐射计 过冷水探测 

分 类 号：TP732.1[自动化与计算机技术—检测技术与自动化装置]