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

Abstract:

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.

Key words: noise coupled, digital auto-gain compensative, airborne microwave radiometer, super-cooled water observation