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Earth acquisition is to solve when earth can be visible from satellite after Sun acquisition during launch and early operation\udperiod or on-station satellite anomaly. In this paper, the algorithm and test result of the Communication, Ocean\udand Meteorological Satellite (COMS) Earth acquisition are presented in case of on-station satellite anomaly status. The\udalgorithms for the calculation of Earth-pointing attitude control parameters including those attitude direction vector,\udrotation matrix, and maneuver time and duration are based on COMS configuration (Eurostar 3000 bus). The coordinate\udsystem uses the reference initial frame. The constraint calculating available time-slot to perform the earth acquisition\udconsiders eclipse, angular separation, solar local time, and infra-red earth sensor blinding conditions. The results of Electronics\udand Telecommunications Research Institute (ETRI) are compared with that of the Astrium software to validate the\udimplemented ETRI software

Implementation and Validation of Earth Acquisition Algorithm for Communication, Ocean and Meteorological Satellite