This paper presents a proposed on-board Telescope Protection Algorithm (TPA) for the Space Infrared Telescope Facility (SIRTF). This TPA consists of hardware and software capable of performing both fail-operational and fail-safe modes of operation. In the fail-operational mode, each ephemeris load and slew/dwell command sequence is checked on-board before use. The slew command monitor detects unallowable slew/dwell commands and transfers control to an algorithm which slews to and maintains a safe telescope orientation while preserving precise attitude determination and control. This fail-operational mode is also given the authority to autonomously restart the slew/dwell sequence at a point beyond the faulty command. The fail-safe system consists of software and hardware which detects impending Earth, moon, or sun avoidance zone violations and activates of a backup hardware safe hold mode. The subject TPA and relevant sensor complement were designed for the SIRTF mission; however, this system can easily be used as a basis for failure detection and correction in a wide range of other missions.
Telescope protection algorithm for the space infrared telescope facility
Teleskopschutz-Algorithmus fuer die Weltraum-Infrarotteleskop-Anlage
AIAA-Papers ; Jan ; 1-10
1988
10 Seiten, 19 Bilder, 5 Tabellen, 6 Quellen
Conference paper
English
Space infrared telescope facility project
NTRS | 1988
|The Space Infrared Telescope Facility (SIRTF)
NTRS | 1998
|SIRTF: The Space Infrared Telescope Facility
NTRS | 1986
|SIRT - The Space Infrared Telescope Facility
NTRS | 2000
|