AuthorCarper, Richard D.
AffiliationSpace Station Program Office
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AbstractThe Space Station Freedom Program (SSFP) plans to utilize several of the Recommendations of the Consultative Committee for Space Data Systems (CCSDS). As it establishes the standard for space/ground communications formats and protocols, the development, use, and baselining of the CCSDS Recommendation for Advanced Orbiting Systems (AOS) is of particular interest to this audience. This paper focuses on the AOS, only incidentally addressing other CCSDS Recommendations. The Space Station Freedom Program is constituted of four separate flight elements. They are the manned Space Base, the European Space Agency (ESA) provided Manned Tended Free Flyer, the NASA provided Polar Orbiting Platform (POP), and the ESA provided Polar Orbiting Platform. The Manned Base flight element itself has four major components furnished by four different national agencies. These are two pressurized modules provided by NASA, a pressurized module provided by ESA, a pressurized module provided by the National Space Development Agency of Japan (NASDA), and a manipulator arm system similar to that used on the Space Shuttle, provided by Canada. The number of international interfaces involved clearly provides an environment in which data systems standards are not only an advantage but a necessity. This paper discusses four aspects of the effect of the AOS within the SSFP which are of special interest. First, the AOS is a new Recommendation of the CCSDS, and the SSFP has been in the unique position of playing a major role in the development of the Recommendation even as the SSFP was maturing it's own data systems concepts and executing it's preliminary design. Several advantages accrued to both the Program and the CCSDS from these parallel processes, including a level and breadth of review and of test bed activities which probably would not otherwise have been possible. These advantages and the interactions of the process are discussed. Second, the four flight elements of the SSFP are quite diverse, and therefore the data systems needs of each is significantly different from those of the others. The AOS Recommendation defines a spectrum of Services from which the flight system designers select those which are needed by their spacecraft. The specific application of the CCSDS AOS Recommendation to each SSFP flight element and the resulting sets of Services provided on each element are discussed. Third, simply by it's existence, the AOS Recommendation has provided a common language and a common framework in which data systems issues could be addressed. The usefulness and importance of the AOS Recommendation within the context both of the international nature of the SSFP and as a part of the generation of inter-organizational support agreements within NASA are discussed. Fourth, the current status of baselining various CCSDS Recommendations, especially the AOS, into the SSFP requirements structure is given.
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