previous radar-intensive, multi-aircraft programs (incl. toga-coare, map, bamex) serve as useful...
DESCRIPTION
VHF Radio Subject to line-of-sight + ‘P-static’ interference limitations Primary conduit for flightdeck-to-flightdeck communications, navigator coordination etc. Backup route for scientific coms (VHF1/VHF2); useful for more extended discussions between/ among chief scientists Communications PathwaysTRANSCRIPT
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Previous radar-intensive, multi-aircraft programs (incl. TOGA-COARE, MAP, BAMEX) serve as useful models
Key considerations:
• Identify communications pathways, including associated hardware/software requirements
• Refinement of planned tracks to integrate Doppler, in situ and dropsonde observations
• Give simultaneous attention to flight safety (platform separation, dropsonde releases at safe distance from lower-level aircraft) -and- efficiency in meeting RAINEX scientific objectives
In-flight Aircraft Coordination and Communications for RAINEX
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BAMEX* Communications Overview (*Bow Echo & MCV Experiment, St. Louis/MidAmerica Airport,
20 May – 6 July 2003)
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VHF Radio• Subject to line-of-sight + ‘P-static’ interference
limitations
• Primary conduit for flightdeck-to-flightdeck communications, navigator coordination etc.
• Backup route for scientific coms (VHF1/VHF2); useful for more extended discussions between/ among chief scientists
Communications Pathways
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Digital Data bursts via satcom• RAINEX will require periodic (ideally automated)
transmission of aircraft locations and selected in situ quantities
• AC locations at 1 min resolution desirable for ingest into Zebra and generation of track plots
• Presumably requires medium-bandwidth (e.g. GlobalStar 9600 baud or better) pathway vs. ASDL
• Ops Center integrates data from existing operational pathways (e.g., NHC dropsonde relay) with specialized RAINEX data (e.g., track info + non-QC’d flight-level data)
Communications Pathways
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Interactive Text Messaging (e.g., IRC Chat)• Requires continuous satcom PPP connection
• Supports rapid platform/mission status updates, efficient and accurate exchange of waypoints
• Conduit for Ops Center input to airborne science team re: mission strategies, contingency plans etc.
Communications Pathways
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Image Files• Key data sources include GOES satellite imagery
and lower-fuselage (LF) surveillance radar maps from lead NOAA P-3
• Critical to rapid assessment/response to both initial and evolving eyewall + rainband structure
• Following download of LF data from lead P-3, Ops Center integrates multiple-platform track history, LF and/or satellite data, then re-distributes retrospective view + proposed tracks
• Bandwidth limitations require careful attention to geographical scope and resolution of imagery
Communications Pathways
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Communications Priorities/Limitations
Lead NOAA P-3 executing Module-2 (eyewall-penetrations) may track beyond VHF coms range limit w.r.t. Module-1 AC
Realistic turn-around times for LF download/re-distribution likely approach 30 min, during which precip patterns may both translate and evolve
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• Desirability of geometrically simple tracks (~straight-line or smoothly-varying curvilinear) for highest quality dual-Doppler sampling of rainbands
Other Coordination Issues
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• Tightly-timed tracks (e.g. coordinated dual-AC “quad-Doppler”) bring special challenges
• Navigators, working closely w/ scientists, often pivotal in successful execution
Coordination Issues (cont.)
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100 km
3 a/cmissionNRL-blackPiggy-whiteKermit-blueGIV/C130-red
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100 km
2 a/cmissionNRL-blackKermit-blueGIV/C130-red
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Dropsonde Coordination
Suggested tracks of GIV,C130
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RSMAS
C130/GIV NRL/P3KermitPiggy
ATD
NHCJOSS
airground
Simplified RAINEX Data Flow
HRD