Fernandez-Borda, Roberto

Fish, Chad

Martins, J. Vanderlei

Nielsen, Tim

Remer, Lorraine

Schoeberl, Mark

Sparr, Leroy

DigitalCommons@USU

HARP CubeSat – An innovative HyperangularImaging Polarimeter for Earth Science ApplicationsSmall Sat Pre-Conference Workshop, Logan Utah – 3 Aug 2014J. Vanderlei Martins, Tim Nielsen, Chad Fish, Leroy Sparr, Roberto Fernandez-Borda, Mark Schoeberl, Lorraine Remer HARP OrganizationsGSFC @ Greenbeltand WallopsFunding: ESTO InVESTLaunch:   CSLI - ELaNa2HARP Objectives• Advance Hyperangular, Imaging Polarimetric concepts for the NASA/ACE (Aerosol, Cloud and Ecosystems) Mission• Prove that CubeSat technology can provide science-quality multi angle imaging data paving the way for lower cost aerosol-cloud instrument developments.• Student training.HARP Science Goal• Demonstrate the ability to characterize the micro physical properties of aerosols and clouds at the scale of individual moderate-sized clouds for the ultimate purpose of narrowing uncertainties in climate change.• Final Instrument: March/2015• Full Spacecraft flight-ready: Sept/201530 5 10 15 20 25 30-10-505reffT [oC][µ m]12 3HARP Science – Clouds and Aerosols Polluted CleanCloudsPolluted Clouds have smaller droplets and grow deeper without precipitatingClean Clouds have larger droplets and start earlier precipitationHARP Science- Pollution aerosols narrow cloud droplet distributions and postpones rain- Smaller droplets increase cloud albedo and affect Earth’s energy balance- Polarized rainbow signal provides droplet effective radius and variance measurements- HARP will measure pollution aerosols and cloud droplets5HARP Pioneering Hyper-Angular Capability will Provide Full Cloudbow Retrievals from Small Area (< 4x4km from space)HARP CubeSat PolarimeterIntensityPolarizationDAD and A produce cloud droplet effective radius and varianceWater Droplet DistributionReff = 20µmVeff = 0.01Reff = 20µmVeff = 0.09Effective Radius (µm)These two cases are undistinguishable from Intensity measurements only (MODIS/VIIRS)HARP Pioneering Hyper-Angular Capability will Provide Full Cloudbow Retrievals from Small Area (< 4x4km from space)HARP CubeSat PolarimeterIntensityPolarizationDASame retrieval capability for all individual pixels with         < 4x4km resolutionWater Droplet DistributionReff = 20µmVeff = 0.01Reff = 20µmVeff = 0.09Effective Radius (µm)These two cases are undistinguishable from Intensity measurements only (MODIS/VIIRS)Heritage from PACS ER2 Airborne PolarimeterCurrent VNIR system• Ground Resolution = 37m• 470, 550, 670, 766, 870nm• 1 K pixel X-track• 65+ angles for all wavelengths• 130 view angles for 670nmSWIR Under construction:• 1650, 1880, 2130, 2250nm • 320x256 pixels• Adjustable FOV8Three Polarized ImagesIntensity0°HARP Prism:Intensity45°Intensity90°[I Q  U]pixel = [I0 I45 I90]⋅MHARP Scheme for Hyperangular Multi-Wavelength Polarization ImagesPrism/Polarization SeparationMulti/Hyper Angle with multiple pushbroomsMulti WavelengthStripe Filters: Angular and Wavelength SeparationHARP• Up to 60 viewing angles • 440, 550, 670, 870nm• 2.5km resolution• 94 deg FOV X-track• 110 deg FOV along track10Multiple Viewing Angles (>50 angles by airborne PACS)HARP Instrument & SpacecraftUMBC Imaging PolarimeterSDL Spacecraft12Spacecraft ViewsBack view- Thermal Radiators- Star Camera aperture- Sun Sensor- GPS Patch AntennaFront view- Deployed Solar Arrays and Antenna- ADCS Sensors- Instrument aperture at the bottom13HARP – Full Feature Earth Sciences Satellite- XACT Blue Canyon ACDS- Sun Sensor + Star tracker- Wide FOV hyperangular, polarized imaging payload- 4 wavelengths- L3 UHF radio- Telemetry: 1.43 Gbits/day- Data Acquisition: up to 8.6Gbits/day- 2.5km spatial resolution- 0.66km pointing knowledge/geolocation14HARP Pointing Modes• Deep Space - Dark Reference• Moon calibration• Horizon calibrationNadir Data CollectionSolar panels pointing at the SunPower Acquisition Scenario17UMBC Calibration/Testing FacilitiesPolarization Calibrator Thermo-Vac testing•ESD benches•Thermo-Vac testing•Machine shop•Clean room;   etc.18SDL FacilitiesNOVA LABNanoSattesting• Certified facilities (ESD, etc.)• Thermo-Vac, shake tables• Machine shop• Clean rooms , etc.19SDL Mission Ops CenterNASA Wallops Flight FacilityGround Station ArchitectureSoftware Defined RadioData ArchiveUMBC Science Operation  CenterL3 InControlSoftwareData AnalysisData DistributionLink Frequency (MHz) Rate (Mbits/s)Uplink 450, FSK 0.0096 Downlink 468, QPSK 3• SDL will remotely access InControl software running at Wallops to generate commands and inspect live telemetry• Raw Data will be archived and distributed from SDL• Level 1B and Level 2 Data will be processed at UMBC SOCOps PC20UMBC SOCClouds:Cloud heightDroplet radius and varianceIce/water phaseSCIPP SoftwareHDF5Gridded GeolocatedCalibratedLevel1B dataλ440nm550nm         870nm      670nm  Lat.Lon.Geometry(viewing and solar)UMBC SOC HARP levels 1 and 2 Data ProductionUMBC ServerArchive and Distribution Level 1B DataLevel 2 Data ProcessingObservation GeometrySDL Mission Ops CenterAerosols:Optical Depth and microphysical properties.Level 2 Goals21Thank you!!!Backup Slides:2324Example of  hyperangular observations of sunglint from PACS-AircraftDoLP - Red Intensity RGB25Hyperangular Movie of Cloubowfrom PACS-AircraftIntensity RGBDoLP - Green10/16/2013 HARP - Systems Requirement Review - UMBC proprietary26HARP Pioneering Hyper-Angular Capability from Space will Provide Full Cloudbow Retrievals from Small Area (~4x4km)IntensityPolarization27Cloudbow Measurements Possible for highly variable ScenesDAD and Aparameters allow for measurements of cloud droplet effective radius and varianceMajor Program MilestonesProgram Milestone Target Date StatusRequirements Review 10/2013 CompletedInstrument Single Design Review 2/10/2014 CompletedPreliminary Design Review 2/11/2014 CompletedMission Critical Design ReviewInstrument Delta SDR07/3/2014 CompletedDelivery Functional Instrument Unit #1 1/2015 On scheduleHot Swap with Flight Unit #2 (Allows for extra calibration on flight unit)3/2015 On scheduleObservatory Integration 2/2015 On scheduleLaunch Readiness 9/2015 On scheduleObservatory Operations TBDScience Observations TBD29

HARP CubeSat – An innovative Hyperangular Imaging Polarimeter for Earth Science Applications

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HARP CubeSat – An innovative Hyperangular Imaging Polarimeter for Earth Science Applications

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