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China National Aerospace Science and Industry Corporation Second Institute 203 has successfully developed the world's first vacuum environment full-polarization radiometer calibration source, and then overcome the polarization grid winding technology, developed the first batch of high-precision large-diameter polarization in China Grid and the first fully automatic grid winding system.
As a core component in the calibration source for fully polarized radiometers, the polarization grid is a key component in the millimeter-wave terahertz quasi-optical link. In passive remote sensing, it is mainly used for polarization separation of electromagnetic waves. The polarized grid is made up of many parallel wires. In the grid applied to the terahertz band, on a square of 200 mm side, it is necessary to evenly wrap a wire of 1200 m long; at least 30 wires are wound in a width of 1 mm, and the width of each wire is only equivalent to the hair. One-seventh, a slight deviation will break, causing the entire grid to be invalid.
The large-diameter polarized grid used in the calibration source of the fully polarized radiometer not only requires extremely high electrical characteristics, but also needs to increase the temperature control function, perform high and low temperature and vacuum environment tests, and provide a complete data package. The channels introduced abroad are basically blocked and must be resolved through independent research. Because the grid products are too small, many powerful R&D institutions have not paid attention to them. You must use your equipment to use the best grid in the world, while saving a lot of money.
At present, the project team has received the customization requirements of the space environment polarization grid of the Fengyun series meteorological satellite load development unit, which will be used as a key component of the effective detection load system to realize the polarization separation of signals of different remote sensing channels.
