Attitude determination for KOMPSAT-2 using star identification technique

Korea Aerospace Research Institute (KARI) is developing a Korea Multi-Purpose Satellite-2 (KOMPSAT-2), which accommodates Multi-Spectral Camera (MSC) with the realization of 1 m panchromatic and 4 m multi-spectral high-resolution images. Upgraded mission requirements for pointing accuracies of AOCS will be supported by designing the flight software including a new attitude determination algorithm associated with newly adopted star trackers. This paper describes feasibility test to the application of star identification technique based upon those proposed by G. Ju et. al to the AOCS of KOMPSAT-2 for attitude determination. Detailed algorithms for precise attitude determination are suggested including star catalog design, star pattern identification, attitude estimation. The identification algorithms proposed were tested using the Monte Carlo method to validate their reliability and to cover full sky tests.