Spacecraft development

Gaia spacecrafttest set up andsequenceThermal environment tests, in vacuumchamberPHASETBTVPUMPINGHOTCOLDTITREOPERATIONSAFE COLDRECOVERYCOOLINGPLATEAUPLATEAUThermalThermalSub PhasesBalanceBalance Heating up Plateau Cooling down PlateauValidationValidationTMMHeater Set up the TVSet up the TVDepressurise &TMM TMMFunctionalFunctional Return totransientvalidation. HOTCOLDOBJECTIVEset-up the initialCorrelation CorrelationTests at highTests at low Ambiant Press.validationColdest environmentenvironmentconditionOPS HOT Safe Modetemperaturetemperature & Temp.OPS COLDEnvironment. transienttransient10130 hPa 10130 hPaCHAMBERPRESSURE < 10 -5 hPa < 10 -5 hPa < 10 -5 hPa < 10 -5 hPa < 10 -5 hPa < 10 -5 hPa < 10 -5 hPa < 10 -5 hPaSOLAR FLUX OFF OFF OFF OFF OFF OFF OFF OFF OFF OFFTTA & SA DUMMY Simulated Simulated Simulated Simulated Simulated Simulated Simulated SimulatedTEMPERATURE Not controled solar flux solar flux solar flux solar flux solar flux solar flux solar flux solar flux Not controled(1280 W/m²) (1400 W/m²) (1280 W/m²) (1280 W/m²) (1430 W/m²) (1430 W/m²) (1100 W/m²) (1100 W/m²)SVMTEMPERATURE Ambient (20°C) Ambient (20°C)PROFILECONFIGURATION S/C LAM FOM (LGA) SOM (PAA) Specific Specific LAMAOCS SBM IGM (CPS) NM (MPS) thermal conf thermal conf SBMSpecific ISST Specific ISST Specific ISST Specific ISSTPDHS OFF ON ON OFF OFF OFFCDU OFF ON OFF OFFPLM Ambient (20°C) Ambient (20°C)TEMPERATUREPROFILE-120°CGaia PayloadModule incryochamber inLiegeMars ExpressThermal vacuumwith Sun simulationIntespace, Oct 2002EMC environment testsGaia,/SoyuzRF CompatibilityGaia,RF AutocompatibilityConducted EMC,S/C openedTorino, Aug 2002Marsis radar antennaMock up characterisation,Intespace, Nov. 2002Radiated EMC & RFCFlight configuration,Intespace, Jan 2003