The Field Camera Unit Project definition, organization, planning S. Scuderi INAF – Catania

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<ul><li><p>The Field Camera UnitProject definition, organization, planningS. Scuderi INAF Catania </p></li><li><p>FCU subsystemsWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Phase A objectivesDefinition of scientific objectives Science team constitution FCU top level requirements definition Filter passbands definitionAnalysis of technical (optics, mechanics, electronics) solutions to satisfy system and scientific requirements.Identification of solutions through trade-off processesDevelopment of AIV and GSE principlesWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Phase B1 objectivesIdentification of critical elementsAnalysis of expected performancesFinalization of trade off processesConsolidation of the project through feasibility of subsystemsCosts assessmentWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Project development planTo = 09/2006?Time</p><p>PhaseDurationMilestonesDatesKick-off MeetingToPhase A4 monthsPRRTo + 4 monthsPhase B14 monthsSRRTo + 4 monthsPhase B12 monthsEnd B1To + 2 months</p></li><li><p>FCU Work Breakdown Structure</p></li><li><p>Cameras: objectivesDefinition of cameras performances specifications: iterative process with science teamOpto-mechanical design of the camerasDefinition of the architecture of the detector (science &amp; availability)Geometric characteristics (dimensions, format, pixel size)Opto-electronics characteristics (QE, temporal resolution, dynamical range, operational modes, dark current, read-out noise)Definition of mechanisms filter wheelsshuttersPreliminary design of electronics architecture (detector &amp; mechanisms front-end electronics)Definition of cameras mass, power and thermal budgetDefinition of interface requirements with main frame (optics, mechanics, electronics, thermal)Preliminary definition of operational modes of the camerasPreliminary definition of calibration requirements: pre-flight &amp; in-flightTelemetry requirementsWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Cameras: top level requirementsWSO-VIL-INST-CNF-0003 (21 Feb 2006)</p></li><li><p>FCU accommodation</p></li><li><p>FCU constraints definitionAvailable volume: =550mm h=170mmPower Budget: 51W15W Imagers36W DHU &amp; PSUMass Budget: 24kg2kg per camera8kg Imager case10kg DHU &amp; PSUOptical bench temperature: 20C (E3C) </p></li><li><p>Mechanical FrameMechanical Frame Design Concept Requirements definition of mechanical frameAnalysis of mechanical interfacesAnalysis of materialsAnalysis of masses and volumes3D Model Thermal Control Design Concept Requirements definition of FCU thermal controlAnalysis of thermo-mechanical interfacesAnalysis of materialsWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Data Handling UnitAnalysis of interfaces requirementsRequirements of transmission protocolRequirements of data busDefinition of packets formatDefinition of bit rateSpecification of electrical &amp; mechanical interfaces with cameras and spacecraft DHUAnalysis of central DHU characteristicsDefinition of handshake sequencesDefinition of operational sequencesReliability requirements: detection and recovery of failuresDefinition of mass and power budgetEnvironmental requirements (radiation, EMC, thermal, mechanical)SW budgetSpecification of telemetry and commandsWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Power Supply UnitPower budget analysis Definition of electrical characteristics of PSU in its various operational modes (Stand-by, normal, peak values, ecc.). Definitions of environmental requirements for PSU (temperature, radiation, EMC, vibration, pressure etc)Analysis of power distribution from PSU towards FCU subsystems (cameras, filter wheels, shutters, DHU, etc.) Analysis of PSU thermal outputWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Ground Support EquipmentDefinition of subsystem requiring GSEGSE design concept: definition of requirements and procedures for FCU pre-flight calibration and definition of in-flight calibrationsOptical design of OGSE calibration system and proposals for in-flight calibrationsDefinition of interfaces requirements among OGSE, EGSE, MGSEDefinition of data format, procedures for data archiving, database access, pipeline procedures for data reductionDefinition of GSE development plan Costs assessment for realization of PFU GSEWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Assembly Integration VerificationIdentify the approach for all the activities for assembling, integrating and verifying the Field Camera Unit in terms of objectives, procedures, facilities, resources e type of test to performThe AIV Plan will deal with the activities starting since the delivery of the subsystems (UV cameras Optical camera, mechanical frame,) until the end of the integration phase and the verification of FCU performancesWIC Meeting, Moscow, 27-30 June 2006</p></li><li><p>Specifications and Constraints for Optical InstrumentsPerformance requirementsMTF at specified spatial frequenciesRadial energy distributionEncircled energy at specific wavelengths or numerical apertureFocal lengthMagnificationAngular or linear field of viewEntrance and exit pupil sizes and locationsSpectral transmission requirementsImage orientation for a given objectSensor characteristicsDimensionsSpectral ResponseElement Size and spacing and/or frequency responseSize, shape, weight limitationsSurvival and operating environmental conditionsInterfaces (optical, mechanical, electrical, etc.)Thermal stability requirementsDuty cycle and useful life requirementsMaintenance and servicing provisions (access, fits, clearances, torquing, etc.)Emergency or overload conditionsCenter of gravity location and lifting provisionsHuman-instrument interface requirements (including safety aspects)Electrical requirements and restrictions (power consumption, frequency, phase, grounding, etc.)Material selection recommendations and limitationsFinish/color requirementsInspection and test provisionsElectromagnetic interference restrictions and susceptibilityStorage, packaging, and shipping requirements</p></li><li><p>General topicsFocal plane layout, numbers and types of camera, related general questionOptical and mechanical designCamera digital interfaceChoice between existent MIL1553 interface and other hi-speed interface.General discussion about cameras protocol with onboard computerCamera calibration problemFlat field calibration problems for optical and UV camera.Discussion about additional flat field source (optical/UV)Optical camera detailsType of detector, general characteristic Shutter.Filters.Analog binning on chip (if CCD chosen)Pre-flash system (if CCD chosen)Read-Out speed, ADCRequired temperature for detectors.Type of cooling system.Power consumption and dissipation.UV camera detailsType of detector, general characteristicsFilters.Read-Out speed, ADCEstimation for power consumption</p></li></ul>