Contemporary AOCS are equipped with local Attitude Control Computers which provide sophisticated Attitude and Orbit Control functions, automatic Failure Detection and Isolation functions and extensive Telemetry and Telecommand handling functions. Generic models of the design, development and test life cycle approaches for such intelligent AOCS are emerging. Also knowledge of the activities to be performed and the generic design, development and test environments to be used during the different phases is accumulating. Lessons learned can be used to improve AOCS development life cycle approaches and to define new development and test environments which improve the efficiency of the design, development and test life cycle and quality of the product. The SAX (Satellite per Astronomia a raggi X) satellite is equipped with a contemporary AOCS providing the above mentioned functions. In this paper the SAX AOCS software design, development and test life cycle is described as an example of AOCS software development. Lessons learned and suggestions for possible improvements are given.


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