ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite SystemAVNIR-2Electronic UnitScanning Radiometer UnitDigital Signal ProcessorOptical Cal AssemblyMultiplex ModuleLamp CalModule BTLM/CMD Process ModuleUpwelling RadiationLamp CalModule APointingMechanismPointingMirrorModulePointingMirrorModuleSTROpticsCondenserModuleFocusAdjustmentModuleSpectroscopyModuleTelescopeModuleDetector DriverElectrical CalElectronicsDriverElectronicsDetectorModulePre-ampModuleDetectorPost-ampA/D ConvElectronicsAnalog SignalProcessorHarnessTiming Signal SwitcherDC/DC ConverterTLM/CMD ProcessorTLM/CMD Process ElectronicsDC/DC ConverterPower SupplyThermal ControllerPIUDC/DC ConverterALOS SystemDrive Control AssemblyControllerRedundantsystemPartiallyredundantsystemDC/DC ConverterSTRFigure 3.2-4 AVNIR-2 Block Diagram3-12
ALOS Data Users HandbookMain characteristics of AVNIR-2 is shown in Table 3.2-5 and the main operation modes are given by Table 3.2-6.Table 3.2-5 AVNIR-2 Main CharacteristicsItem Specification RemarksObservation wavelength ch 1: 0.42 – 0.50 µmch 2: 0.52 – 0.60 µmch 3: 0.61 – 0.69 µmch 4: 0.76 – 0.89 µmSpatial resolution (IFOV)10m (Approx. 14.28 µrad)Spatial frequency transmission ch 1-3: 0.25, ch 4: 0.20characteristicsObservation width> 70 km (Approx. 5.8 degree)Number of detectors7100 / bandScan cycle1.48 millisecondMTF Band 1 – 3 : > 0.25Band 4 : > 0.20(At the Nyquist frequency)Gain4 stepsS/N > 200 Settable per bandRegistration accuracy between bands Setting accuracy within ± 8 µmVariation element within ± 4 µm(on the orbit)Pointing angle± 44 degreePointing setting step angle 0.01875 degree/pulse At light axisPointing angle setting accuracy Within 0.05 degreePointing angle reading accuracy Within 0.05 degreeEncoder unit0.044 degree (light axis)AD bit8 bit / pixelData rate 160 Mbps (40 Mbps/band) Before compressionTable 3.2-6 AVNIR-2 Operation ModesMode Content RemarksObservation ObservationStandbySet and keep a condition to transit into observationmode or calibration modes1 Calibration using internal lamp ACalibration 2 Calibration using internal lamp B3 Calibration using both internal lamps A and B Option3-13
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Section 7 Overview of Processing Al
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ALOS Data Users HandbookSection 8 D
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ALOS Data Users Handbook8.5 Outline
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ALOS Data Users HandbookALOS Centra
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ALOS Data Users HandbookWith respec
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ALOS Data Users Handbook8.7 AUIG8.7
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ALOS Data Users Handbook8.7.3 NOTES
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APPENDIXALOS Data Users Handbook
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Appendix 1 Acronyms and Abbreviatio
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ALOS Data Users HandbookAppendix 2
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ALOS Data Users Handbook

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