During the Space Flight Mechanics 2 course, it is requested to design a satellite ADCS, setting up a MATLAB® Simulink model, based on the assigned project specifications. PARA is an hypothetical satellite for Earth surface observation, on sunsynchronous orbit, three axis stabilized with reaction wheels (RWA), mounting a sun sensor and a star sensor. Its asset is parameterized and computed with the Direct Quaternion Method. You may download the whole project (zip, 2.55 Mb) under Creative Commons licence (BY, NC), reporting in your own MATLAB code the author's name ant this website URL. Have fun!