The
Service Module consists of a closed box, shaped around a hollow central
cone, and comprises the lower and upper platforms as well as four side
panels, on which all satellite bus units are installed. The functions
provided by the Service Module (SVM) are:
- The primary
and secondary structures to interface with the launcher adapter, to
support the subsystem units, and to interface with and support the
Mirror Support Platform and the Telescope Tube - The thermal
control to maintain the SVM units and equipment within specified
temperature limits, and to provide a very strictly controlled thermal
environment for the mirror assemblies - The Attitude and Orbit
Control System (AOCS) for precise pointing/slewing in all operational
modes, and for the performance of orbit acquisition/maintenance via the
RCS propulsion system (reaction Control System) - The On-Board
Data Handling (OBHD) for the decoding of ground telecommands, the
distribution of ground on-board commands, the sampling and formatting of
telemetry data, and central on-board time distribution - The
Radio Frequency System (RFS), operating in S-band, ensuring
communications with the ground stations and providing a ranging mode for
orbit determination - The Electrical Power Subsystem (EPSS)
for the generation and distribution of regulated power to all equipment
via a 28 V main bus
 |
| An exploded view of the XMM Service Module, with its side panels open. Thanks to its particular shape, with a large central hole of 2.10 m diameter, the XMM bus can be used to accommodate a large variety of payloads. |
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Last Update: 19 September 2011
14-Aug-2014 20:01 UT
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