Download - MEIDEX – Operational Philosophy
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MEIDEX
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MEIDEX – Operational Philosophy
IAFSpace BranchMajor Meir Moalem
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MEIDEX
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Problem
• Dust storms are random events
• …So are sprites
• Abundance is different throughout the year
• ROIs are limited
• Airplane location - another constraint
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MEIDEX
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Solution
• Define “rigid” ROIs
• Have a valid forecast
• Maximize observation opportunities– Record every pass of ROI with sufficient lighting
– Additional degree of freedom (truss)
• Allow for flexibility in operational activation
• Collect a large sample of scientific data
• Define secondary, tertiary missions
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MEIDEX
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General
• Aerosols backscattered light measurements
• Xybion multi-spectral camera, 6 W/L NIR to NUV, 14*10 FOV
• SEKAI CCD viewfinder, 60º FOV
• ADVCR digital recorders, 360 min total time
• Canister with 16" quartz window and HMDA
• Operated by PGSC WIN98 software
• Backup recording at the AFD (DSR-20)
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MEIDEX
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The MEIDEX Payload
Gimbal Motor and Worm Drive
Worm Gear
SEKAI Camera
Lower End Plate
Upper End Platew/ Quartz Window
Upper support plates
Optical Bench/Support
Xybion Camera
Lens and Baffle
Avionics Mount Platew/ electronics
Bearing and Brake (both sides)
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MEIDEX
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Operational Event Cycle
• Dust forecast
• Observation planning:– Where (if exists) is the dust plume?
– Where is the Shuttle?
– Where is the airplane?
– Secondary mission?
• Execute package
• Observation
• Astronaut (operations, backup, feedback)
• Quick analysis and re-plan
Fusion
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MEIDEX
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Who’s Who and Where
• TAU forecast center
• POCC
• Air Plane Base (Crete)
• Aeronet stations
• Sprites VLF stations
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TAU forecast center
Atlantic ROI
POCCExp. Command
&Control Med. ROI
SPRITES
Global coordination in Real TimeSTK scenario
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MEIDEX
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Secondary Missions
• Sprites – ionospheric TLEs
• Sea surface (Albedo)
• Slant visibility studies
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MEIDEX
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Nominal (aerosols) Operations
• Bay-to-earth attitude, -ZLV directed to pass target (as forecasted), nadir view or a small bias
• Activate payload, use SEKAI for orientation
• “fine tune” truss pointing to dust plum (if possible)
• Record science data on MEIDEX canister and AFD (DSR-20)
• Monitor storm developments
• Supply ground planners with any useful information
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MEIDEX
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Sprite Operations
• General convective forecasts, large possible areas (stk pic)
• Earth limb view attitude– Tail (or nose) to earth
– Bay away from RAM
• FOV pointing above horizon
• Record lightning activity
• “fine tune” with truss
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MEIDEX
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Execute Package
• What’s in it?– Time of operations
– Location of targets (dust plumes, sprites)
– Location of airplane
– Forecast maps
– Payload related data \ instructions
– Any other remarks
• When will it be provided?– 24H in advance
– 1-2 times per mission day / shift
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MEIDEX
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Example: Day # 007
• Data from mission timeline:– 4 observational opportunities
– 2 * dust, 2* sprites
• STK scenario:– Where is the shuttle?
– Where is the airplane?
– Define exact timeline for operation
• Ex. Pkg.:
• Observation from space, monitor from ground
• Feedback? Changes between orbits
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MEIDEX
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Back-up Recording
• Recording within the payload: 360 min.
• Backup #1: DSR-20– First to start recording, last to stop
– Used for playback to ground when no KU
• Backup #2: digital VCR at JSC, records playback orbits
• Backup #3: analog at GSFC– Degraded quality, probably not sufficient for scientific analysis
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MEIDEX
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Calibration
• Moon calibration:– Shuttle moon pointing maneuver
– Moon entering the Xybion FOV
– Maintain a 2-5 deg. Deadband for 10 min.
– Problem:
• Alignment of experiment with the -ZLV
• Perform an alignment check on a pre-determined target
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MEIDEX
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POCC Operations
• When:– A PS is not available
– Target of opportunities
• What is required:– Open the HMDA (the door…)
– AFD recording
– Real-time video downlink
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MEIDEX
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Anomalies
• Possible reasons:– Failures (use redundancy, camera definitions)
– Special scientific input (filter change)
• Pre-defined from ground in the Ex. Pkg.