4 Final Report - Emits - ESA

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4 Final Report The CPS considered for Geo-Oculus is the same of E3000 platform. The variable is given by the propellant tanks capacity. The CPS main features are: • He pressurized bi-propellant system (MMH + MON-3) • Four cylindrical tanks / one central pressurant tank • Common propellant storage and feed system • One 450 N LAE • Seven pairs of 10N RCT’s Figure 4.5-11: Geo-Oculus CPS Schematic The basic CPS sizing option is performed for option 1 of Table 4.5-12 which is the solution without EPS. The result is presented in the following table. Page 4-68 Doc. No: GOC-ASG-RP-002 Issue: 2 Astrium GmbH Date: 13.05.2009
4 Final Report Table 4.5-13: CPS Mass Budgets for considered options Budget Element Option 1 Total CPS Dry Mass 162.9 Total residual 26.82 Total CPS EOL Mass 189.7 Useful Propellant load 1793.9 Total CPS BOL Mass 1983.6 4.5.7.2 EPS The Electric Propulsion System (EPS) architecture is deriving from: • Option 2: existing and available commercial solutions • Option 3: iterations with AOCS definition and is the one used for most simulations of section 4.5.6 (Attitude and Orbit Control) The necessary iterations with AOCS definitions are needed to optimise on board resources request (power, mass, volume) while fulfilling mission requirements. The architecture is summarised in the following table: Table 4.5-14: EPS Architecture summary for the two options, Option 2 and Option 3 Option 2: EPS + MBW Option 3: EPS only Main Manoeuvre Thruster (MMT) 2 main + 2 redundant + 2 thruster pointing mechanisms 8 main + 8 redundant MMT Thrust 80 mN 30 mN MMT Duty Cycle 100% during NSSK 85% during manoeuvres (twice a day) re-pointing manoeuvres MMT PCU 1 main+1 redundant, each driving 2 2 PCU, each driving 4 main + 4 thrusters redundant MMT Fine Pointing Thruster (FPT) / 12 main + 12 redundant FPT Thrust / FPT Duty Cycle / 1% during fine pointing FPT PCU / 2 PCU, each driving 4 main + 4 redundant MMT EPS for Option 2 The EPS for Option 2 can be based on existing EPS for Eurostar 3000, with an architecture as per Option 2 of Table 4.5-14, using SPT-100 as thrusters (HET type, 80 mN of thrust, 1510 s of Isp). Doc. No: GOC-ASG-RP-002 Page 4-69 Issue: 2 Date: 13.05.2009 Astrium GmbH
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Geo-Oculus: A Mission for Real-Time
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1 Final Report 1 Introduction 1.1 S
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