CAR/SAR ATN/GNSS Seminar / Seminario ATN/GNSS CAR/SAM

CAR/SAR ATN/GNSS Seminar / Seminario ATN/GNSS CAR/SAM

Service Technique de la Navigation Arienne GROUND GROUND BASED BASED AUGMENTATION AUGMENTATION SYSTEM SYSTEM System System Overview Overview Christophe ChristopheDEHAYNAIN DEHAYNAIN Direction DirectionGnrale Gnralede delAviation lAviationCivile Civile GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar FRANCE FRANCE Page 1 Service Technique de la Navigation Arienne GROUND GROUNDBASED BASEDAUGMENTATION AUGMENTATIONSYSTEM SYSTEM Presentation Presentation Overview Overview GBAS OVERVIEW Why Whydo dowe weneed

needan anaugmentation augmentationto toGNSS GNSS?? Local LocalArea AreaDifferential DifferentialGNSS GNSSPrinciple Principle GBAS GBASGround GroundSegment Segment GBAS GBASAirborne AirborneSegment Segment Conclusions Conclusions CAR/SAM ATN/GNSS Seminar Page 2 Service Technique de la Navigation Arienne GBAS GBASConcept Concept System SystemOverview Overview ICAO ICAOName Name::GBAS GBASfor forGround GroundBased BasedAugmentation AugmentationSystem System Operational OperationalCoverage Coverage:: minimum minimum::same sameas

asILS ILS recommended recommended::Omni Omnidirectional directional(radius (radius23 23NM) NM)up up to toFL FL100 100and anddown downto to12 12ft ft Data-Link Data-LinkFrequency Frequencyrange range::108 108--118 118MHz MHz(25 (25kHz kHzspacing) spacing) Operational Operationalobjective objective:: minimum minimum::Category Category11approach approach optional optional::22D Dnavigation navigation(Positioning (PositioningService) Service) Localisation Localisation::Airport Airport GBAS OVERVIEW

CAR/SAM ATN/GNSS Seminar Page 3 Service Technique de la Navigation Arienne GBAS GBASOverview Overview Do Do not not mistake mistake GBAS GBAS for for :: DGPS, DGPS,LADGPS LADGPS::initial initialUS USgeneric genericnames namesfor forGBAS GBASconcept concept SCAT1 SCAT1or orSpecial SpecialCategory Category11::US USRTCA RTCAstandard standarddefining definingaanonnoninteroperable interoperablesystem systemfor forprivate privateuse use LAAS LAAS ::Local LocalArea AreaAugmentation AugmentationSystem System::present presentUS USname namefor for GBAS

GBAS GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 4 Service Technique de la Navigation Arienne WHY WHYGNSS GNSSNEEDS NEEDSAN ANAUGMENTATION AUGMENTATION?? GPS Only Civil Aviation CATEGORY I Requirements PERFORMANCE H. 13 m V. 23 m 99% (RAIM) GBAS OVERVIEW ACCURACY (95%) AVAILABILITY H 16.0 m V 4.0 m 99.75 % ? INTEGRITY 3,5.10-7/ approach Time to alarm 6 s ? CONTINUITY OF SERVICE 10-4 / approach (10-5 / 15 s)

CAR/SAM ATN/GNSS Seminar Page 5 Service Technique de la Navigation Arienne LOCAL LOCALAREA AREADIFFERENTIAL DIFFERENTIALPRINCIPLE PRINCIPLE II--Basic BasicPrinciple Principle Measurements Measurementsmade madeby bytwo tworeceivers receiversare areaffected affectedby bythe thesame sameerrors errors as aslong longas asthese thesetwo tworeceivers receiversare arenot nottoo toofar farfrom fromeach eachother other RX2 RX1 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 6

Service Technique de la Navigation Arienne LOCAL LOCALAREA AREADIFFERENTIAL DIFFERENTIALPRINCIPLE PRINCIPLE IIII--Differential DifferentialCorrection CorrectionCalculation Calculation Actual SV Position Broadcast SV Position Calculated Range REF Measured Pseudoranges Corrections Calculation Differential Message Broadcast Known Reference Location USER The Thefirst firstreceiver receiverin inaareference referencestation stationcan cancalculate calculatethese these errors knowing its exact location (corrections calculated errors knowing its exact location (corrections calculatedby

by the theGBAS GBASground groundstation) station) The Thesecond secondreceiver receiver(the (theuser) user)will willuse usethese thesecorrections correctionsto to correct correctits itsown ownmeasurements measurementsand andincrease increasethe theaccuracy accuracyof of these thesemeasurements measurements GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 7 Service Technique de la Navigation Arienne GBAS GBASground ground segment segment II--BBasic asicarchitecture architectureof ofaareference referencestation station Differential Message Broadcast Antenna

GPS/GLONASS Antennas Receiving Unit (up to 4 Reference Receivers) Data Broadcast Unit Data processing for broadcast Raw Data PR, ephem.,time Data Processing Unit Differential Corrections Calculation Integrity Monitoring Functions GBAS Messages Elaboration GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 8 Service Technique de la Navigation Arienne GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 9 Service Technique de la Navigation Arienne GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 10 Service Technique de la Navigation Arienne GBAS GBASground ground segment segment IIII--VHF VHFData DataBroadcast Broadcast(VDB)

(VDB) GBAS GBASVDB VDB characteristics characteristics:: VHF VHFNAV NAVband band(108 (108--118 118MHz), MHz),channel channelspacing spacing25 25kHz kHz DD8PSK PSK(Differential (Differential88States StatesPhase PhaseShift ShiftKeying) Keying)modulation modulation 8 22Hz Hzupdate updaterate rate(Pseudorange (PseudorangeCorrections) Corrections) 88slots slotsTime TimeDivision DivisionMultiple MultipleAccess Accesstechnique technique(16 (16per per second) second) Horizontal

HorizontalPolarisation Polarisationor orElliptical EllipticalPolarisation Polarisation (Recommendation) (Recommendation) 50W 50Wground groundtransmitter transmitterpower power(Typically (Typicallypower powerfor forHPOL) HPOL) Omni-directional Omni-directionalantenna antenna Coverage: Coverage:23 23NM NMradius radius GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 11 Service Technique de la Navigation Arienne GBAS GBASground ground segment segment III III--VDB VDBmessage messagecontent content The The current current SARPS SARPS require require the the transmission transmission of of three three message

message types types:: Differential DifferentialCode CodeCorrections Correctionsand andintegrity integrityData Data Reference ReferencePoint Pointand andGBAS GBASData Data Final FinalApproach ApproachPath Pathdescription description GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 12 Service Technique de la Navigation Arienne GBAS GBASground groundsegment segment IV IV--GBAS GBASGround GroundSystem SystemClassification Classification The Theglobal globalperformances performancesof ofGround GroundSystem Systemare

arelinked linkedto to:: the theNumber Numberof ofinstalled installedGNSS GNSSreceivers receivers(2 (2to to4) 4) The Thequality qualityof ofthe theGNSS GNSSsignal signalreception reception AA Ground Ground Accuracy Accuracy Designator Designator (GAD) (GAD) will will qualified qualified the the ground ground segment segment GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 13 Service Technique de la Navigation Arienne GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 14 Service Technique de la

Navigation Arienne GBAS GBASUser Usersegment segment I-Basic I-Basicoperations operations GBAS GBASwill willbe bebasically basicallyused usedas asan anILS ILS(ILS (ILSLook-alike Look-alikeconcept) concept) RNAV RNAV 2D 2D operations operations may may be be developed developed ifif the the Ground Ground System System support supportthe thePositioning PositioningService Service GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 15 Service Technique de la Navigation Arienne GBAS GBASUser Usersegment segment II-Airborne II-AirborneEquipment Equipment

Multi-mode Multi-modeReceivers Receivers(MMR) (MMR)and andtheir theirassociated associatedGPS GPSand andVHF VHF antennas antennaswill willbe beused usedfor forGBAS GBASapproaches approaches No Nohardware hardwareupdate updateisisforeseen foreseen(Software (Softwareonly) only) GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 16 Service Technique de la Navigation Arienne Conclusions Conclusions The The GBAS GBAS system system as as standardised standardised inin ICAO ICAO Annex Annex 10 10 isis able able toto serve serve Cat-I Cat-I operations. operations. Advanced Advanced operations operations such

such as as Cat-II/III Cat-II/III or or A-SMGCS A-SMGCS are are under under consideration considerationby byICAO ICAOGNSS GNSSPanel Panel GBAS GBASground groundstations stations are arebeing beingbuilt, built, are areconsidered consideredin inseveral severalimplementation implementationprogrammes programmesin inthe theWorld World are arebeing beingdeveloped developedwithin withinMulti-Mode Multi-ModeReceiver Receiver are areconsidered consideredin inseveral severalaircraft aircraftmanufacturer manufacturerprogrammes programmes

GBAS GBASairborne airborneequipment equipment Standards StandardsStatus Status ICAO ICAOStandards Standards(SARPS) (SARPS)are areavailable available Other OtherStandards Standards(Doc (Doc4444, 4444,Doc Doc8071, 8071,PANS PANSOPS) OPS)are arebeing being finalised finalised Industry IndustryStandards Standards(MOPS) (MOPS)are arebeing beingdeveloped developedand andwill willbe besoon soon available available GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Page 17

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