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The CASCADE Programme
General Aviation ADS-B Workshop
ADS-B Technical Issues
C. TamvaclisEUROCONTROL Experimental Centre
European Organisation for the Safety of Air Navigation
Content
ADS-B system requirements
ADS-B infrastructure
Equipment availability and certification
Safety and Performance issues
Interoperability issues
Equipment developments
Final remarks
ADS-B System Requirements
[ADS-B OUT] Aircraft must broadcast at least 2-D position, barometric altitude, and flight identification
with prescribed characteristics specified in aviation standards integrity, latency, accuracy, continuity, availability …
and including position integrity indication
[ADS-B IN] Ground and airborne ADS-B receivers must report targets within prescribed coverage volumes and with adequate update periods
suitable surveillance data processing and display systems are also neededcoverage and update rates are application dependent
Air to ground and air to air broadcast datalinkfor global interoperability 1090 MHz Extended Squitter (1090ES)
locally VDL-4 and/or UAT may also be used
minimum aircraft equipageADS-B OUT
1090ES capable Mode S transponderGNSS receiver and baro altimeter
ADS-B IN1090ES receiverCockpit Display of Traffic Information (CDTI)
minimum ground equipageOne or more 1090ES ground receivers [stations][surveillance data processing system]
for tracking and fusion with other surveillance data
situation display
ADS-B Infrastructure
1090ES ADS-B OUT System
Mode STransponderGPS
PositionHFOM
(VFOM)HPL
(VPL)Time
Extended Squitter
IdentityPosition
NUCVelocity
BarometricAltimeter
FL
24-bit address
TransponderControl Panel
Callsign SPI-EI
1090ES ADS-B IN System
Mode SReceiverGPS
Own PositionHFOM
(VFOM)HPL
(VPL)Time
BarometricAltimeter
FL
24-bit address
CDTI
Ext. Squitter
IdentityPosition
NUC(Velocity)
ADS-B Validation Testbed
ATCC simulator
CWPFPPS
Radars
ADS-B GS
Flight plans
Cockpit
ADSP
ADS-B Network
ADS-B reports
AST cat 21
A/C Sim
Trackertracks
AST cat 62
plots
ADS-B reports AST cat 21
TIS-B
Server
Aircraft Traffic Generator
+recording replays
Airborne Tracker
ADS-B Server
TIS-B GS
Link Error Emulator
RMCDE
ACAS
All ADS-B system components are commercially availableEquipment and installation need to be certified for ops useAircraft equipment:
Mode S Transponder: 1090ES potentially a software upgrade on newer transponder models, certified to
RTCA MOPS 260/A and FAA TSO C166EUROCAE ED73B/102 and EASA ETSO 2C112b
1090ES Receiver: Few products in the market, standalone or combined with TCAS
RTCA MOPS 260/A and FAA TSO C166
GNSS Receiver: Pre 2003 GPS receivers may not provide integrity signalling. Required certification:
FAA TSO C129a (RAIM), C145/146 (SBAS), C161 (GBAS)
CDTI: Some products in the market but no certification available
Equipment availability and certification
Safety and Performance Issues
Requirements under development by the Requirements Focus Group (RFG)
ED-126 will address ADS-B surveillance in non radar airspaces
The current 1090ES system has been designed to meet requirements in the RTCA MASPS [DO-242/A]
therefore current MOPS may need to be updated in the future
Quality of ADS-B installation onboard the aircraft is critical need for reliable indication of position integrity and low latency
CDTI is critical for airborne surveillance applications [ADS-B IN]requirements are not agreed as yet
Need for airborne tracking function?HMI factors and placement in cockpit
Interoperability Issues
Multiplicity of 1090ES standards FAA standardizing on DO-260A while existing equipage is mostly DO-260
DO-260A is backwards compatible with DO-260RTCA recently published DO -260/A Change 1
need for features added in RTCA DO-260A has to be clarified [RFG work]
1090 MHz Band availabilityADS-B over 1090ES operates in the same RF Band as SSR, Mode S, and TCAS/ACASinterference could become a problem in Core Europe
ADS-B IN will be affected firstThere are mitigations
SSR upgrade to Mode S, replacement by ADS-B and more sophisticated ADS-B receivers.
Equipment Developments
The CASCADE Programme is sponsoring development of airborne and ground equipment needed for its ADS-B validation activities
ADS-B and TIS-B ground station [Thales ATM]ADS-B system Oct 06
TIS-B system April 07Airborne 1090ES ADS-B/TIS-B Receiver [ Selex Communications]
delivery May 07CDTI [Selex Communications/EUROTELEMATIC]
delivery Dec 06Usable for air traffic situation awareness applications
for general and business aviation aircraft
Final remarks
ADS-B OUT over 1090ES can be implemented today existing GPS and Mode S aircraft installations may be upgradeable to ADS-B, need for ADS-B equipment and installation airworthiness approval
ADS-B IN lacks CDTI standards and airworthiness certificationAir Traffic Situation Awareness standards in development [RFG]
There are many ADS-B equipment developments targeting General Aviation, for example:
low power and light weight 1090ES systems a “light” transponder standard is in development
integrated systems:1090ES transponder and receiverGPS and CDTI