A description of the TIMED Spacecraft

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Spaceborne And Space Research Instruments, Apparatus, And Components, Artificial Earth Satellites

Scientific paper

The Thermosphere, Ionosphere, Mesosphere, Energetic and Dynamics (TIMED) Spacecraft is being designed at The Johns Hopkins University Applied Physics Laboratory (JHU/APL) as the first Solar Terrestrial Probe in the NASA Solar Connections Program. The spacecraft must support the operation of four scientific instruments for two years with a significant amount of autonomy, as TIMED will be run with a low cost mission operations concept. A robust, fully redundant spacecraft has been designed which features an Integrated Electronics Module, containing RF and digital subsystems in a common card cage, and 32-bit RISK processors. The Global Positioning System (GPS) will be used for on-orbit tracking, navigation, and event based commanding. Several experimental modes of spacecraft operation will be attempted, including stellar only navigation, coarse attitude determination using GPS, and atmospheric sensing using GPS.

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