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Verifying the Accuracy of Flight Tracking at Logan

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					  Verifying the Accuracy of Flight
         Tracking at Logan
Tom Breen – Director of Systems Engineering
Massport Replacement NOMS Project History

RFP released for a replacement NOMS (2004)
 • Complete replacement of all noise monitors (36)
 • Replacement of analysis software (ENOMS)
 • New flight tracking system that can track at both BOS and BED
RFP required testing of each component
 •   Provides assurance that nothing will change suddenly
 •   Promotes public confidence in the viability of the new system
 •   Insures that new system is at least as good as the old one
 •   Vendor has complied with the RFP requirements
Era’s AirScene NOMS contracted (2005)
 • Proposal included multilateration tracking system
         Multilateration could overcome radar line-of-sight issues at BED
         Modularity of the technology insured that solution could be scaled if requirements
         were not met

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Massport NOMS Testing Scope

What were the testing requirements
 • Comprehensive seven-day and 24-hour test periods
 • Side-by-side testing of noise monitors (simultaneous installation)
 • Testing and verification of flight track coverage and accuracy
Precedent setting system and requirements
 • Traditionally, only noise monitors and software are tested
 • Massport system required two airport coverage from one unified system
 • Coverage at second airport is critical (BED) to system acceptance
       2004 complaints – BOS 3,600 BED 6,700
 • Tracking required to be within 5% of the STARS and ADS-B (GPS)




                                                                        3
Project Area




               Boston - Hanscom (BED)




                                                    Boston - Logan (BOS)




                                        ASR Radar




                                                                           4
 What is Multilateration Flight Tracking

“Triangulation” on aircraft transponders
 • Time difference of arrival (TDOA)
 • Passive or active (interrogation)
 • High accuracy, update rate, reliability
 • Each MLAT sensor is ADS-B capable
 • Requires no additional on-board technology




                                                5
 Multilateration Sensor Locations

Tracking to the threshold at BOS and BED
 • Eight sensors installed in the project area
 • All sensors contribute to the tracking at both airports




                                                             6
Modeled Coverage at 100 feet AGL




             Multilateration - grey   Radar - white   7
Modeled Coverage at 200 feet AGL




             Multilateration - grey   Radar - white   8
Modeled Coverage at 300 feet AGL




             Multilateration - grey   Radar - white   9
Modeled Coverage at 400 feet AGL




             Multilateration - grey   Radar - white   10
Modeled Coverage at 500 feet AGL




             Multilateration - grey   Radar - white   11
Typical BOS Tracks




    AirScene Mlat    STARS - radar

                                     12
Typical BED Tracks




    AirScene MLAT    FAA STARS

                                 13
Typical Tracking at BED




                          Multilateration
                             STARS




                                     14
Typical Tracking at BED



                          Multilateration
                             STARS




                                     15
Flight Track Testing – Preliminary Results


Multilateration Compared to STARS and ADS-B (GPS)
  • One day selected for detailed comparison (November 13th, 2007)
       Day selected for high number of flight operation changes
       Represents a worst case scenario for flight tracking system
  • ADS-B, STARS (radar), and multilateration tracks were compared
    graphically
  • STARS and multilateration were compared
       ADS-B tracking omitted from this analysis due to low track count
       Total aircraft tracked and identified




                                                                          16
Flight Track Testing – Preliminary Results



AAL108
Departure
Runway 15R
B772




                                                                   17
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



AAL108
Departure
Runway 15R
B772




                                                                   18
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



AAL108
Departure
Runway 15R
B772




                                                                   19
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



AAL155
Arrival
Runway 4R
B772




                                                                   20
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



AAL155
Arrival
Runway 4R
B772




                                                                   21
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



AAL155
Arrival
Runway 4R
B772




                                                                   22
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



NWA38
Departure
Runway 15R
A333




                                                                   23
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



NWA38
Departure
Runway 15R
A333




                                                                   24
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Preliminary Results



NWA38
Departure
Runway 15R
A333




                                                                   25
                    ADS-B – light blue STARS – yellow Mlat - red
Flight Track Testing – Totals

Analysis of Test Data (November 13th, 2007)
  • Approximately 1,400 total flight operations recorded for BED and BOS
  • Data from STARS and multilateration was compared
       When both systems captured the same flight it was assumed to be valid
       If only one system had the track, it was visually verified
  • AirScene.com NOMS captured 1339 viable tracks
  • ENOMS with radar captured 1062 viable tracks
  • AirScene.com NOMS captured approximately 270 additional aircraft




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Future Trends in Flight Track Verification

Why Flight Tracking System Testing May
Be More Common in the Future
 • WAAS enabled GPS receivers allows
   inexpensive flight testing
       Prospective tracking system clients can now
       pre-test a tracking system
       Tests actual system performance (end to
       end)
       Allows range testing and testing to the
       surface
 • Testing is now easy and less expensive
       ADS-B provides transmission of highly
       accurate (GPS) aircraft position
       About 14% of all aircraft in US airspace are
       squawking their positions
                                                      Flight test of SBA multilateration system
       ADS-B receivers are commercially available
       for less than $1,000


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  Future Trends in Flight Track Verification


The Citizen Flight Tracker – A
Bad Track’s Worst Nightmare
 • Flight tracking system testing now
   available to the public
       Private pilots routinely carry GPS
       equipment in their aircraft
       ADS-B now being used by the
       public to track aircraft with high
       accuracy
       ADS-B mandate by FAA insures
       that increasing percentage of
       aircraft will be broadcasting their
       positions



                                                            A380 Departure Track at MCO
                                             Flight track and graphic created by concerned citizen and sent to the
                                                                          noise office


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 Conclusions

Analysis shows that new flight tracking system is meeting or
exceeding accuracy requirements


New system is able to identify more useable flight tracks (those that
include flight number, runway, and registration number)


Thanks to NextGen technology, testing of a flight tracking system’s
accuracy is possible and is relatively inexpensive


Verification of flight tracking system insures highest quality data is
available for additional analyses




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