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Page 1 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GROUND BASED AUGMENTATION SYSTEM System Overview GROUND BASED.

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Presentation on theme: "Page 1 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GROUND BASED AUGMENTATION SYSTEM System Overview GROUND BASED."— Presentation transcript:

1 Page 1 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GROUND BASED AUGMENTATION SYSTEM System Overview GROUND BASED AUGMENTATION SYSTEM System Overview Christophe DEHAYNAIN Direction Générale de lAviation Civile FRANCE

2 Page 2 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GROUND BASED AUGMENTATION SYSTEM Presentation Overview Why do we need an augmentation to GNSS ? Local Area Differential GNSS Principle GBAS Ground Segment GBAS Airborne Segment Conclusions Why do we need an augmentation to GNSS ? Local Area Differential GNSS Principle GBAS Ground Segment GBAS Airborne Segment Conclusions

3 Page 3 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS Concept System Overview ICAO Name : GBAS for Ground Based Augmentation System Operational Coverage : –minimum : same as ILS –recommended : Omni directional (radius 23 NM) up to FL 100 and down to 12 ft Data-Link Frequency range : MHz (25 kHz spacing) Operational objective : –minimum : Category 1 approach –optional : 2 D navigation (Positioning Service) Localisation : Airport ICAO Name : GBAS for Ground Based Augmentation System Operational Coverage : –minimum : same as ILS –recommended : Omni directional (radius 23 NM) up to FL 100 and down to 12 ft Data-Link Frequency range : MHz (25 kHz spacing) Operational objective : –minimum : Category 1 approach –optional : 2 D navigation (Positioning Service) Localisation : Airport

4 Page 4 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS Overview Do not mistake GBAS for : DGPS, LADGPS : initial US generic names for GBAS concept SCAT1 or Special Category 1 : US RTCA standard defining a non- interoperable system for private use LAAS : Local Area Augmentation System : present US name for GBAS DGPS, LADGPS : initial US generic names for GBAS concept SCAT1 or Special Category 1 : US RTCA standard defining a non- interoperable system for private use LAAS : Local Area Augmentation System : present US name for GBAS

5 Page 5 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne WHY GNSS NEEDS AN AUGMENTATION ? PERFORMANCE CATEGORY I Requirements ACCURACY (95%) INTEGRITY AVAILABILITY H. 13 mV. 23 mV 4.0 mH 16.0 m % 3, / approach Time to alarm 6 s 99% (RAIM) GPS Only Civil Aviation CONTINUITY OF SERVICE / approach (10 -5 / 15 s) ? ?

6 Page 6 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne LOCAL AREA DIFFERENTIAL PRINCIPLE I - Basic Principle Measurements made by two receivers are affected by the same errors as long as these two receivers are not too far from each other RX1 RX2

7 Page 7 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne LOCAL AREA DIFFERENTIAL PRINCIPLE II - Differential Correction Calculation –The first receiver in a reference station can calculate these errors knowing its exact location (corrections calculated by the GBAS ground station) –The second receiver (the user) will use these corrections to correct its own measurements and increase the accuracy of these measurements –The first receiver in a reference station can calculate these errors knowing its exact location (corrections calculated by the GBAS ground station) –The second receiver (the user) will use these corrections to correct its own measurements and increase the accuracy of these measurements REF USER Known Reference Location Calculated Range Actual SV Position Broadcast SV Position Corrections Calculation Differential Message Broadcast Measured Pseudoranges

8 Page 8 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS ground segment I - B asic architecture of a reference station Receiving Unit (up to 4 Reference Receivers) Data Processing Unit Data Broadcast Unit Raw Data PR, ephem.,time Differential Corrections Calculation Integrity Monitoring Functions GBAS Messages Elaboration Data processing for broadcast GPS/GLONASS Antennas Differential Message Broadcast Antenna

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11 Page 11 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS ground segment II - VHF Data Broadcast (VDB) GBAS VDB characteristics : –VHF NAV band ( MHz), channel spacing 25 kHz –D 8 PSK (Differential 8 States Phase Shift Keying) modulation –2 Hz update rate (Pseudorange Corrections) –8 slots Time Division Multiple Access technique (16 per second) –Horizontal Polarisation or Elliptical Polarisation (Recommendation) –50W ground transmitter power (Typically power for HPOL) –Omni-directional antenna –Coverage: 23 NM radius GBAS VDB characteristics : –VHF NAV band ( MHz), channel spacing 25 kHz –D 8 PSK (Differential 8 States Phase Shift Keying) modulation –2 Hz update rate (Pseudorange Corrections) –8 slots Time Division Multiple Access technique (16 per second) –Horizontal Polarisation or Elliptical Polarisation (Recommendation) –50W ground transmitter power (Typically power for HPOL) –Omni-directional antenna –Coverage: 23 NM radius

12 Page 12 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS ground segment III - VDB message content The current SARPS require the transmission of three message types : –Differential Code Corrections and integrity Data –Reference Point and GBAS Data –Final Approach Path description The current SARPS require the transmission of three message types : –Differential Code Corrections and integrity Data –Reference Point and GBAS Data –Final Approach Path description

13 Page 13 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS ground segment IV - GBAS Ground System Classification The global performances of Ground System are linked to : –the Number of installed GNSS receivers (2 to 4) –The quality of the GNSS signal reception A Ground Accuracy Designator (GAD) will qualified the ground segment The global performances of Ground System are linked to : –the Number of installed GNSS receivers (2 to 4) –The quality of the GNSS signal reception A Ground Accuracy Designator (GAD) will qualified the ground segment

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15 Page 15 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS User segment I-Basic operations GBAS will be basically used as an ILS (ILS Look-alike concept) RNAV 2D operations may be developed if the Ground System support the Positioning Service GBAS will be basically used as an ILS (ILS Look-alike concept) RNAV 2D operations may be developed if the Ground System support the Positioning Service

16 Page 16 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne GBAS User segment II-Airborne Equipment Multi-mode Receivers (MMR) and their associated GPS and VHF antennas will be used for GBAS approaches No hardware update is foreseen (Software only) Multi-mode Receivers (MMR) and their associated GPS and VHF antennas will be used for GBAS approaches No hardware update is foreseen (Software only)

17 Page 17 GBAS OVERVIEW CAR/SAM ATN/GNSS Seminar Service Technique de la Navigation Aérienne ConclusionsConclusions The GBAS system as standardised in ICAO Annex 10 is able to serve Cat-I operations. Advanced operations such as Cat-II/III or A-SMGCS are under consideration by ICAO GNSS Panel GBAS ground stations –are being built, –are considered in several implementation programmes in the World GBAS airborne equipment –are being developed within Multi-Mode Receiver –are considered in several aircraft manufacturer programmes Standards Status –ICAO Standards (SARPS) are available –Other Standards (Doc 4444, Doc 8071, PANS OPS) are being finalised –Industry Standards (MOPS) are being developed and will be soon available The GBAS system as standardised in ICAO Annex 10 is able to serve Cat-I operations. Advanced operations such as Cat-II/III or A-SMGCS are under consideration by ICAO GNSS Panel GBAS ground stations –are being built, –are considered in several implementation programmes in the World GBAS airborne equipment –are being developed within Multi-Mode Receiver –are considered in several aircraft manufacturer programmes Standards Status –ICAO Standards (SARPS) are available –Other Standards (Doc 4444, Doc 8071, PANS OPS) are being finalised –Industry Standards (MOPS) are being developed and will be soon available


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