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The "Eleventh Five-Year" 863 topical subject acceptance meeting in the field of ground observation and navigation was held in Beijing. The subject of "Key Technology Research of Interferometric Millimeter Wave Imaging Radiometer" undertaken by the Space Science and Applied Research Center of the Chinese Academy of Sciences passed the acceptance.
This subject is one of the first batch of topic projects in the field during the "Eleventh Five-Year Plan". The main objective is to develop the time-sampling integrated aperture technology as the core in response to the urgent need for microwave / millimeter wave payloads in geostationary meteorological satellites The key technical problem is to solve the problem that the antenna aperture of the real aperture system is too large and the number of unit antennas of the traditional integrated aperture system is too large. Under the current background of global climate change aggravation and frequent severe weather phenomena, it is of special significance to carry out this research.
During the implementation of the project, the space center research team led by researcher Wu Ji proposed a ring array spin scanning solution, which has obvious advantages in simplifying the system complexity, improving the stability of the motion mechanism and the feasibility of calibration, and In the end, independent intellectual property rights were formed and the field imaging experiment was successfully carried out.
At the subject acceptance meeting, the review experts agreed that the team successfully verified the feasibility of the interferometric integrated aperture radiometer system in the 50-56GHz oxygen absorption peak frequency band, reaching the highest frequency of the domestic interferometric radiometer technology. And broke through a number of key technologies with international level, including: analysis method of key performance indicators of interferometric integrated aperture radiometer under time-sharing sampling system; joint optimization design method of sparse antenna array and time-sharing sampling method; millimeter wave receiver Front-end noise mutual coupling suppression method; multi-latency digital correlation technology; global calibration technology of time-sampling interferometric integrated aperture system, etc. The research results strongly support the feasibility and necessity of implementing a comprehensive aperture atmospheric temperature detector on China's next-generation Fengyun-4 geostationary satellite. The geostationary orbit (GEO) has the characteristics of large coverage and real-time, and the microwave / millimeter wave observation has the advantages of all weather and all time. The combination of the two can achieve continuous and effective observation of the entire dynamic process of weather changes, which is numerical weather. The forecast provides observation data with high time resolution to meet the requirements of short-term forecast and even real-time forecast.
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