A geostationary orbit microwave multi-channel radiometer

The geostationary orbit microwave multi-channel radiometer has the advantages of high real-time performance and large coverage, which plays an important role in typhoon, strong precipitation detection, medium-to-short-term meteorological/oceanic forecasting. However, due to difficulty engineering development payload, its application on-orbit not yet been achieved at present. To satisfy requirements fine quantitative satellite observation data, a with 10-m-caliber is developed, spatial resolution horizontal polarization better than 24 km 54 GHz. In radiometer, quasi-optical feed network covering nearly 28 frequency octave bands ranging from 23.8 664 GHz proposed solve technical problem multi-frequency sharing system. Meanwhile, high-precision reflector preparation method unfolding scheme are proposed, considered as solution for large-diameter maintaining surface accuracy. A antenna prototype 0.54-m tests performed verify key technologies, such grating reflectors micron level, accuracy sub-millimeter wave electrical testing. results indicate that measured main beam efficiency 95.5%. addition, system sensitivity greater 1.5 K, calibration 1.8 according analysis radiometer’s essential parameters errors.