4 Final Report - Emits - ESA
4 Final Report - Emits - ESA
4 Final Report - Emits - ESA
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4 <strong>Final</strong><br />
<strong>Report</strong><br />
Figure 4.5-10: Baseline AOCS configuration<br />
Table 4.5-11: AOCS equipment and modes<br />
Sensors Actuators<br />
Mission phase Coarse GYP Earth IRES Star STR Sun BASS Fine LiASS IMU MBW CPS<br />
Transfer & Acquisition � � � � �<br />
On station: Normal mode � � �<br />
On station: Station Keeping � � � �<br />
Safe mode Transfer � � �<br />
Safe mode On-Station (�) � �<br />
4.5.7 Propulsion System<br />
The Propulsion System of the mission is composed by:<br />
• Chemical Propulsion System (CPS): it is intended for GTO-GEO Transfer and, in the option<br />
without EPS, also for Station Keeping, wheel off-loading and de-orbiting.<br />
• Electric Propulsion System (EPS): it is optional and, if present, it is intended for reaction<br />
wheel off-loading or for active pointing (for an AOCS without reaction wheels).<br />
The following table summarises the possible options and the tasks allocated to CPS and EPS.<br />
Table 4.5-12: Propulsion System Options for Geo-Oculus<br />
Option 1 2 3<br />
No EPS EPS + MBWs EPS only<br />
GTO-GEO CPS CPS CPS<br />
NSSK + EWSK CPS EPS EPS<br />
Deorbiting CPS CPS EPS<br />
Wheel off-loading CPS EPS /<br />
Pointing Manoeuvres / / EPS<br />
The main propulsion requirements, as deriving from AOCS analysis, are the following:<br />
• Transfer ΔV: 1500 m/s + 50 m/s margin,<br />
Page 4-66 Doc. No: GOC-ASG-RP-002<br />
Issue: 2<br />
Astrium GmbH Date: 13.05.2009
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