GRANASAT MULTI-SENSOR ATTITUDE DETERMINATION SYSTEM TESTED IN BEXUS19 STRATOSPHERIC BALLOON

摘要

GranaSAT designed and built a low-cost attitude determination system, a fundamental system for any spacecraft, based on a star and horizon sensor, acceleration and Earth's magnetic field measurements. The same Charge Coupled Device was used for both the star sensor and the horizon sensor. For the star sensor the Lost in Space functionality was designed, the identification algorithm used is a variation of the Matching Group algorithm proposed by Van Benzooijen; for the horizon sensor a simple detection algorithm is proposed, with the circle fitting method based on Umbach and Jones work, and for the magnetometer and accelerometer sensors the attitude was estimated by a two vector matching procedure based on Wahba solution.