Réflexions sur les futurs systèmes de navigation du CEV

Un petit papier présentant quelques réflexions sur les futurs systèmes de navigation du CEV

http://ntrs.nasa.gov/search.jsp?R=514907&id=1&qs=No%3D70%26Ne%3D2%26N%3D123

( lien direct vers le pdf : http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070005131_2007004869.pdf )

The Orion Crew Exploration Vehicle (CEV) will be the first human spacecraft built by NASA in almost 3 decades and will be the first vehicle to perform both Low Earth Orbit (LEO) missions and lunar missions since Apollo. The awesome challenge of designing a Guidance, Navigation, and Control (GN and ampC) system for this vehicle that satisfies all of its various mission requirements is countered by the opportunity to take advantage of the improvements in algorithms, software, sensors, and other related GN and ampC technology over this period. This paper describes the CEV GN and ampC reference architecture developed to support the overall NASA reference configuration and validate the driving requirements of the Constellation (Cx) Architecture Requirements Document (CARD, Reference 1) and the CEV System Requirements Document (SRD, Reference 2). The Orion GN and ampC team designed the reference architecture based on the functional allocation of GN and ampC roles and responsibilities of CEV with respect to the other Cx vehicles, such as the Crew Launch Vehicle (CLV), Earth Departure Stage (EDS), and Lunar Surface Area Module (LSAM), across all flight phases. The specific challenges and responsibilities of the CEV GN and ampC system from launch pad to touchdown will be introduced along with an overview of the navigation sensor suite, its redundancy management, and flight software (FSW) architecture. Sensors will be discussed in terms of range of operation, data utility within the navigation system, and rationale for selection. The software architecture is illustrated via block diagrams, commensurate with the design aspects.