We are happy to announce the release of our free Textbook Companion App for MATLAB (2012b or later). Based on four Chapter 2 walk through tutorials, the goal is to design a geostationary spacecraft, maintaining an exact orbital position, delivering a -126 dB in the Ku band, and 7 year lifetime.
The GUI allows us to look at the results of various gravity models, summing various types of disturbances caused by the sun-angle, a basic geo-synchronous orbit simulation, and then a full simulation that incorporates the orbit, disturbances, and Control and Link parameters. 
The app is available on the textbook support page: http://support.psatellite.com/sct/theory_textbook.php.
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