Opportunities to Leverage Aircraft-Derived Atmospheric Observation Data
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1 Opportunities to Leverage Aircraft-Derived Atmospheric Observation Data Michael McPartland 5 December 2017 Sponsor: Gary Pokodner, ANG-C6 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
2 Motivation Atmospheric observations are critical to aviation activities Sample Observation Systems Ground sensors (e.g., ASOS) Strategic Activities Sample applications Weather Models Flight Planning Traffic Management Tactical Activities Sample applications Balloon sensors (e.g., radiosondes) Aircraft-derived observations Real-time Tools ATC Decision- Making Pilot Decision- Making AdOs via Mode S EHS - 2 ASOS = Airport Surface Observation System
3 Aircraft-Derived Observation Usage in Forecasts Atmospheric observations used to best represent initial conditions in the forecast volume above the surface More important to forecast accuracy Winds (m/s) Average reduction in wind RMS vector error From [1] -0.1 A B C D E F G H J Observation source A radiosonde obs B aircraft obs C profiler obs Exp. Profiler control D radar reflectivity E VAD wind F GPS-Met G GOES satellite obs H surface obs including METAR cloud J AMVs Exp. cloud drift Aircraft-derived weather observations are the most important input in wind and temperature forecast accuracy AdOs via Mode S EHS - 3 [1] James, E., and S. Benjamin, 2017: Observation system experiments with the hourly-updating Rapid Refresh model using GSI hybrid ensemble/variational data assimilation. Mon. Wea. Rev. doi: /mwr-d , in press.
4 Aircraft-Derived Observations Aircraft measurements can be used for atmospheric observations Wind vector Meteorological Data Collection & Reporting System (MDCRS) is current airborne source Air referenced vector ADS-B Weather could enable greater access to aircraft-based observations, but not for foreseeable future Mode S Enhanced Surveillance (EHS) widely available now and can act as near-term surrogate for ADS-B Weather AdOs via Mode S EHS - 4 ADS-B = Automatic Dependent Surveillance Broadcast
5 Observation System Comparisons Observation Source Horizontal Coverage Vertical Range Update Period Latency Comment ASOS 900 sites many at airports Surface only 20 min/ 1 min <1 min Used primarily for airport operations Radiosondes 69 sites in CONUS Ground to >100 kft 12 hr < 2 hr Used primarily for forecast input data Aircraft-Derived Observations MDCRS Mode S EHS ADS-B Weather (future) Limited fleet coverage (<20% current US fleet) Growing fleet coverage (>50% current US fleet) None now, could be meaningful % in future Ground to typical cruise altitudes Ground to typical cruise altitudes Ground to typical cruise altitudes 6 sec ground, 1 min ascent/ descent 7 min cruise min, Average is 17 min sec Seconds ~10 sec Seconds Used primarily for forecast input data Useful for forecast & real-time operations Specifications not planned until at least 2019 Opportunity to assess enhanced aircraft-derived observations via Mode S EHS to guide development of future applications and ADS-B Weather specifications AdOs via Mode S EHS - 5 ASOS = Airport Surface Observation System MDCRS = Meteorological Data Collection & Reporting System Mode S EHS = Mode S Enhanced Surveillance
6 Outline Background Current Aircraft-Derived Observation Systems Comparison of MDCRS & Mode S EHS Aircraft-Derived Observation Data Future Opportunities to Leverage Aircraft- Derived Atmospheric Observation Data AdOs via Mode S EHS - 6
7 Current System Characterization MDCRS: North American, 11 airlines reporting E-AMDAR: Europe, 14 airlines reporting Inertial reference unit Clock Air data computer ACARS GPS Typical Data Winds Temp RH% EDR Meteorological Community Ground stations ARINC Airlines AdOs via Mode S EHS - 7 E-AMDAR = European Aircraft Meteorological Data Relay ACARS = Aircraft Communications Addressing and Reporting System RH = Relative Humidity EDR = Eddy Dissipation Rate
8 MDCRS Spatial/Temporal Coverage Current sampling across country is varied and limited to a small percentage of commercial flights/routes Latitude (degrees) Age at 3 PM EST (minutes) Longitude (degrees) -60 AdOs via Mode S EHS - 8
9 MDCRS Latency MDCRS data are delayed due to batching before transmitting Average observation delay = 17 minutes MDCRS Observation Delay within CONUS Nov 1, 2017, 24-hrs (n=521648) 4.5 (x10000) Delivery to Ground Station Delay (mins) Not appropriate for near real-time applications AdOs via Mode S EHS - 9
10 Sample MDCRS Coverage Around Boston At BOS, about 5% of scheduled flights report MDCRS data Nov 1, 2017, 2:00-3:00 PM EST Age at 3 PM EST (minutes) observations Latitude (degrees) Pressure Altitude (kft) Longitude (degrees) Longitude (degrees) 0 Limited MDCRS data available for forecasting and real-time applications: opportunity to leverage Mode S EHS observations AdOs via Mode S EHS - 10
11 Outline Background Current Aircraft-Derived Observation Systems Comparison of MDCRS & Mode S EHS Aircraft-Derived Observation Data Future Opportunities to Leverage Aircraft- Derived Atmospheric Observation Data AdOs via Mode S EHS - 11
12 Mode S EHS Based Observation System Aircraft collects data from its own sources: GPS and on-board sensors Mode S EHS enables interrogation of specific aircraft registers to extract or derive aircraft winds and temperature Register Content Comment 4.8 or 12 sec update rate Air referenced vector Wind vector 0x50 0x60 0x44 Ground speed True air speed Roll angle Track angle Mag heading Mach Altitude rate Wind speed/dir Temperature Used to estimate Wind speed Wind direction Temperature Only 5% of EHS A/C populate AdOs via Mode S EHS - 12
13 Lincoln Mode S EHS Aircraft-Derived Observation Evaluation FAA Mode S radars do not currently interrogate relevant EHS registers* Could do so with simple adaptation modifications Lincoln MODSEF has been adapted to interrogate aircraft within range (60 nmi radius) Data streaming started March 8, 2017 MIT/LL Mode S Experimental Facility (MODSEF) Engineering display 60 NM range 4.8s update rate Example EHS-derived wind vectors AdOs via Mode S EHS - 13 *Exception: Fremont Valley BI6 radar at Edwards AFB, which feeds High Desert TRACON (E10), conducts EHS interrogations
14 Comparison of MDCRS & Mode S EHS Observations Around Boston MDCRS 120 observations Nov 1, :00-3:00 PM EST Age at 3 PM EST (minutes) 0 Mode S EHS 9809 observations Latitude (degrees) Latitude (degrees) Longitude (degrees) Longitude (degrees) >80x increase in atmospheric observations with Mode S EHS vs MDCRS in this case AdOs via Mode S EHS - 14
15 Comparison of MDCRS & Mode S EHS Observations Around Boston Nov 1, 2017 Observations across 24 hours Pressure Altitude (kft) Mode S EHS (n=200986) MDCRS (n=6465) Number of Observations ( 10,000) Number of Observations ( 10,000) (x10000) Local Hour of Day Mode S EHS (n=200986) MDCRS (n=6465) Significantly increased time and altitude coverage with Mode S EHS AdOs via Mode S EHS - 15
16 MDCRS & MODSEF Observations Around Boston Magenta points in figures are RAP model grid points initialized from observation data Age at 3 PM EST (minutes) MDCRS Mode S EHS Opportunity for forecast models to assimilate higher quantities of more recent data AdOs via Mode S EHS - 16 RAP = Rapid Refresh forecast model
17 Outline Background Current Aircraft-Derived Observation Systems Comparison of MDCRS & Mode S EHS Aircraft-Derived Observation Data Future Opportunities to Leverage Aircraft- Derived Atmospheric Observation Data Enhancing Numerical Weather Prediction Models Enhancing Real-time Operations AdOs via Mode S EHS - 17
18 Enhancing Numerical Weather Prediction Performance Quantify potential benefits of enhanced Aircraft-derived Observations (AdO) on forecast model performance Assess impacts of varying amount of data, assimilation period, etc. for aviation and other applications Atmospheric Observations Data Assimilation Numerical Weather Model Performance Assessment AdO Analytical Testbed Parameters: AdO equipage level AdO update rate Data quality Forecast update cycle Aircraft-derived Observation Requirements AdOs via Mode S EHS - 18
19 Enhancing Real-time Operations New procedure opportunities Enhanced wake vortex mitigation procedures, e.g., Heathrow Time-Based Separation procedures Improved RTA and IM procedures Better compression handling e.g., London-Heathrow Time-Based Separation procedure relies on real-time access to Mode S EHS winds Controller benefits Reduced radio calls Increased situational awareness AdOs via Mode S EHS - 19 RTA = Required Time of Arrival IM = Interval Management
20 Recommended Next Steps FAA Architectural considerations Conduct analysis on means to collect and disseminate aircraft-derived observations from Mode S EHS to end users 1030/1090 MHz spectrum analysis of increased interrogations Leverage knowledge gained through near-term Mode S EHS assessment to inform ADS-B weather requirements Operational considerations Identify and develop operational procedures to take advantage of real-time aircraft-derived observations Identify opportunities enabled by emerging UAS operations NOAA/FAA Perform benefits analysis on forecast improvements if large quantities of aircraft-derived observations were available AdOs via Mode S EHS - 20
21 Summary Leveraging aircraft-derived observations holds significant promise for improving weather forecasting and real-time operations Mode S EHS is a currently-available technology enabling immediate access to aircraft-derived observations Inform standards and opportunities for ADS-B Weather Potential to enhance forecasting performance Potential to enhance real-time operations AdOs via Mode S EHS - 21
22 Legal Notices Distribution Statement: Approved for public release; distribution is unlimited. This material is based upon work supported by the Federal Aviation Administration under Air Force Contract No. FA C-0002 and/or FA D Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Federal Aviation Administration Massachusetts Institute of Technology. Delivered to the US Government with Unlimited Rights, as defined in DFARS Part or 7014 (Feb 2014). Notwithstanding any copyright notice, U.S. Government rights in this work are defined by DFARS or DFARS as detailed above. Use of this work other than as specifically authorized by the U.S. Government may violate any copyrights that exist in this work. AdOs via Mode S EHS - 22
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