Antenna Design for the Arctic Weather Satellite Microwave Sounder

The Arctic Weather Satellite (AWS) is a prototype mission for an operational constellation of microwave sounders, complimenting existing meteorological sounders. AWS microsatellite with single cross-track scanning radiometer operating in the 54, 89, 183 and 325 GHz bands. Due to small platform size, core design focus radiometer’s quasi-optics less complexity more compact setup than comparable spaceborne To achieve this, instrument utilises splitblock feedarray which directly illuminates off-axis parabolic reflector. A secondary reflector used couple into wedge-shaped load calibration combination cold sky measurements. main challenge performance that only one four horns can be located Consequently, scan angle dependent spillover variations beam asymmetries occur. This paper details simulation optimisation efforts minimise aforementioned effects.