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The  first geostationary Earth observation satellite of Korea – theCommunication, Ocean, and Meteorological Satellite (COMS) – was successfullylaunched on 27 June 2010. After arrival at its operational orbit, thesatellite underwent an in-orbit test (IOT) that lasted for about 8 months. Duringthe IOT period, the main payload for the weather application, the meteorologicalimager, went through successful tests for demonstrating its function and performance, and the test results are introduced here.  The radiometric performance of the meteorological imager (MI) is tested by means of signal-to-noise ratio (SNR)for the visible channel, noise-equivalent differential temperature (NEdT) forthe infrared channels, and pixel-to-pixel nonuniformity for both the visible andinfrared channels. In the case of the visible channel, the SNR of all eightdetectors is obtained using the ground-measured parameters with thebackground signals obtained in orbit. The overall performance shows a valuelarger than 26 at 5% albedo, exceeding the user requirement of 10 by asignificant margin. Also, the relative variability of detector responsivityamong the eight visible channels meets the user requirement, showing valueswithin 10% of the user requirement. For the infrared channels, the NEdTof each detector is well within the user requirement and is comparable withor better than the legacy instruments, except for the water vapor channel, whichis slightly noisier than the legacy instruments. The variability of detectorresponsivity of infrared channels is also below the user requirement, within40% of the requirement, except for the shortwave infrared channel. The improvedperformance result is partly due to the stable and low detector temperatureobtained due to spacecraft design, i.e., by installing a single solar panelon the opposite side of the MI

Introduction of the in-orbit test and its performance for the first meteorological imager of the Communication, Ocean, and Meteorological Satellite