Presentation is loading. Please wait.

Presentation is loading. Please wait.

Page 1 METIS First Master Training & Seminar Galileo/EGNOS and GPS & Augmented/Differential GPS Prepared by Mamadou Traore GEMCO

Similar presentations


Presentation on theme: "Page 1 METIS First Master Training & Seminar Galileo/EGNOS and GPS & Augmented/Differential GPS Prepared by Mamadou Traore GEMCO"— Presentation transcript:

1 Page 1 METIS First Master Training & Seminar Galileo/EGNOS and GPS & Augmented/Differential GPS Prepared by Mamadou Traore GEMCO

2 Page 2 METIS First Master Training & Seminar, Ifrane (Morocco), European Navigation Satellites GALILEO  It will achieve full independence through dedicated system under civil control EGNOS  It provides an independently controlled civil complement to military GPS and GLONASS

3 Page 3 METIS First Master Training & Seminar, Ifrane (Morocco), GPS and GLONASS without augmentation GPS/GLONASS Satellites Like all other conventional systems, GPS and GLONASS are subject to errors that can degrade the precision of the systems. These are: - Multipath - Ionospheric - Tropospheric - Satellite clock - Orbit - Receiver and Noise - Selective availability, if any Neither GPS nor GLONASS can provide Continuity, Availability, Integrity and Accuracy to be used as sole means of air navigation for all phases of flight. So, augmentation is needed to meet operational requirements User calculates position

4 Page 4 METIS First Master Training & Seminar, Ifrane (Morocco), GPS and GLONASS Augmentation GPS/GLONASS Satellites 1- Receiver calculates Position 4- Transmits error 2- Compares to its own Position 3- Calculates error 1- User calculates Position 2- Applies correction to Calculated Position

5 Page 5 METIS First Master Training & Seminar, Ifrane (Morocco), Benefits of Augmentation GPS/GLONASS augmentation systems meet the operational needs for all phases of flight by providing the four important requirements:  Accuracy: how correct is the aircraft position estimate; thanks to differential corrections  Integrity: the largest aircraft position error can reach without detection; thanks to monitoring algorithms  Availability: how often can the aircraft use the systems and have the desired Accuracy and Integrity; GEOs can be used as additional ranging signals  Continuity: the probability that an operation once commenced can be completed

6 Page 6 METIS First Master Training & Seminar, Ifrane (Morocco), Different Types of Augmentation  DGPS (many transmitting beacons, ionos. influence)  Aircraft-Based Augmentation System (ABAS) - RAIM (Receiver Autonomous Integrity Monitoring) - AAIM (Aircraft Autonomous Integrity Monitoring); INS + Altimetry aiding - FANS (Future Air Navigation System) (low cost, needs many visible satellites)  Ground-Based Augmentation System (GBAS)  Space-Based Augmentation System (SBAS)

7 Page 7 METIS First Master Training & Seminar, Ifrane (Morocco), Aircraft-Based Augmentation System ABAS achieves the 4 requirements of augmentation in the following processing schemes: - Integrity monitoring of the position solution - redundant information (Receiver Autonomous Integrity Monitoring) - additional onboard sensors (Aircraft Autonomous Integrity Monitoring) - Continuity Aiding: using information of alternative sources - Availability Aiding: for the position solution - Accuracy Aiding: through estimation of errors

8 Page 8 METIS First Master Training & Seminar, Ifrane (Morocco), Ground-Based Augmentation Types Pseudo-Satellites (Pseudolites) Local Area Augmentation System (LAAS) Ground-Based Regional Augmentation System (GRAS)

9 Page 9 METIS First Master Training & Seminar, Ifrane (Morocco), Simple Pseudolite Concept A Pseudolite works as a complete “ground-based satellite. Pseudolite position is described in geographical terms while GPS/GLONASS are in the orbital elements used by satellites GPS User Pseudolite at a known point Satellite signal direct to user Satellite signal to Pseudolite GPS/GLONASS satellite Pseudolite makes the following: 1.Measures the satellite signals 2.Creates a precisely timed GPS-like signal 3.Then transmits it over a data link to user

10 Page 10 METIS First Master Training & Seminar, Ifrane (Morocco), Simple Synchrolite Concept GPS/GLONASS satellites Satellite signal direct to user Synchrolite user Four reflected satellite signals Synchrolite at a known position Satellite signals to Synchrolite Synchrolite works as an “electronic mirror ”: Coherent replica of a satellite signal “reflected” by synchrolite and synchronized to a received satellite signal. A Synchrolite has much lesser latency than Pseudolite or any typical reference station

11 Page 11 METIS First Master Training & Seminar, Ifrane (Morocco), GPS/GLONASS augmentation through Pseudolite  Availability: each additional Pseudolite ranging signal represents one less Satellite signal than required for basic navigation  Continuity: since satellites and Pseudolites are separate systems which can be managed by different organizations, the probabililty of a common failure is small  Accuracy: carefully located Pseudolites are available for aircraft in flight below the horizon. Therefore, this will improve the vertical guidance for aircraft  Integrity: using additional ranging and satellite signals, Fault Detection and Fault Exclusion (FDE) can be done

12 Page 12 METIS First Master Training & Seminar, Ifrane (Morocco), Local Area Augmentation System LAAS is a ground-based system which intended to provide the 4 operational requirements in order satisfy aircraft needs for precision approach, landing and surface navigation in very poor visibility. With 20 NM range. The benefits of LAAS are multiple:  Remote Coverage: can augment WAAS in locations with low cost  Modified Approaches: to avoid Obstacles, Noises in sensitive area or crowed airspace  Multiple runway coverage: one LAAS can serve an entire Airport  Surface Navigation: can be used for ground navigation and taxiing

13 Page 13 METIS First Master Training & Seminar, Ifrane (Morocco), Ground-Based Regional Augmentation System GRAS is a ground-based system which will broadcast information through a well developed local VHF network. Used to enhance the safety and efficiency of aircraft operations in all phases of flight (en-route, terminal and instrument approach with vertical guidance). With 200 NM range. The benefits of GRAS are:  Operational for all phases of flight: en-route, terminal and instrument approach with vertical guidance operations  Deploy on Demand: a GRAS can be modified to provide service in specific area only

14 Page 14 METIS First Master Training & Seminar, Ifrane (Morocco), Different Types of SBAS European Geostationary Navigation Overlay Service (EGNOS) Wide Area Augmentation System (WAAS) MTSAT Satellite Augmentation Service (MSAS) GPS And Geo-Augmentation Navigation (GAGAN) Satellite Navigation Augmentation Service (SNAS) Military GPS Augmentation System (MGAS)

15 Page 15 METIS First Master Training & Seminar, Ifrane (Morocco), Space-Based Augmentation System Concept GPS/GLONASS Satellites GEO Master Station SBAS message Integrity & Ranging+ corrections Reference Stations Augmented Navigation

16 Page 16 METIS First Master Training & Seminar, Ifrane (Morocco), EGNOS and Other Existing GNSS Systems

17 Page 17 METIS First Master Training & Seminar, Ifrane (Morocco), Difference between WAAS, EGNOS and MSAS  All 3 Space-Based Augmentation Systems are compatible to each other; so, in principle, they are the same.  The main difference between DGPS and SBAS is the calculation of the Total Electron Content (TEC) map for ionospheric corrections  With DGPS, every single reference station, after comparing its own position with the calculated position, transmits this information on a certain band, as correction.  For SBAS, this is different. Here, the monitoring stations do not provide single isolated corrections, but from all stations together a correction map for a wide area. So, every receiver corrects its position by using this data. That way, the accuracy is even better than with DGPS.

18 Page 18 METIS First Master Training & Seminar, Ifrane (Morocco), Types of SBAS Services Types of SBAS Service CorrectionsHighest Level of service supported GNSS satellite and GEO ranging No correctionThrough NPA Basic differential corrections Clock and ephemerisThrough NPA Precise differential corrections Clock, ephemeris and ionosphere Through APV 2

19 Page 19 METIS First Master Training & Seminar, Ifrane (Morocco), Level of service from GNSS augmentation elements Augmentation elements Oceanic en-route Continental en-route TerminalInstrument Approach and Landing ABAS Suitable for navigation when fault detection and exclusion (FDE) is available Suitable for navigation when RAIM is usable Suitable for NPA when RAIM is available and another service is usable at alternate aerodrome SBAS Suitable for navigation Suitable for NPA and APV depending on SBAS performance GBAS N/A May be used as an input source for approved navigation systems Suitable for NPA and PA CAT1 (potentially CAT2 and CAT3)

20 Page 20 METIS First Master Training & Seminar, Ifrane (Morocco), GNSS avionics standards for augmentation Augmentation systems Technical Standard Order (TSO) Minimum Operational Performance Standards/Minimum Aviation Systems Performance Standards (MOPS/MASPS) ABAS TSO-C129 A Level 2 (en-route) TSO-C129 A Level 1-3 (NPA) RTCA / DO-208 EUROCAE ED – 72 A SBAS TSO-C145 A TSO- C 146 A RTCA / DO-229 C EUROCAE (under development) GBAS Under developmentRTCA / DO 245 RTCA / DO 246 B RTCA / DO 253 A EUROCAE ED - 95

21 Page 21 METIS First Master Training & Seminar, Ifrane (Morocco), How can SBAS augment GPS/GLONASS + Accuracy + Availability + Continuity + Integrity Differential Corrections Use/Don’t Use Message GPS-Like Signal GEO

22 Page 22 METIS First Master Training & Seminar, Ifrane (Morocco), EGNOS GEO Satellites

23 Page 23 METIS First Master Training & Seminar, Ifrane (Morocco), EGNOS Architecture

24 Page 24 METIS First Master Training & Seminar, Ifrane (Morocco), (MEDA) EGNOS Extension Plan for MEDA

25 Page 25 METIS First Master Training & Seminar, Ifrane (Morocco),

26 Page 26 METIS First Master Training & Seminar, Ifrane (Morocco), MULTIMODAL MISSION REQUIREMENTS  Civil Aviation: – Primary means of navigation down to Precision Approach with vertical Accuracy of 7.7 meters  Maritime: – Specified to be better than 4 meters in European Coastal waters – Expected performance around 1 meter horizontal accuracy  Land Applications: – Specified to be better than 4 meters in continental Europe – Expected performance around 1 meter horizontal accuracy (Ref: EGNOS Mission Requirement Document, v 1.2)

27 Page 27 METIS First Master Training & Seminar, Ifrane (Morocco), GNSS Performance Requirements

28 Page 28 METIS First Master Training & Seminar, Ifrane (Morocco), NPA Non Precision Approaches APV Approaches with Vertical Guidance PA Precision Approaches Conventional systems RNAV Lateral guidance RNAV Lateral and vertical guidance Conventional systems RNAV Lateral and vertical guidance APV. BaroV NAV APV I&II VOR/DME NDB Localizer ABAS DME/DME ABAS DME/DME BaroVNAV SBAS GNSS Galileo ILS MLS PAR GBAS ICAO Classification of Approaches

29 Page 29 METIS First Master Training & Seminar, Ifrane (Morocco), Services provided by EGNOS EGNOS system will provide the following services: GEO Ranging (R-GEO): Transmission of GPS-like signals from 3 GEO : AOR-E, IOR and ARTEMIS. This will augment the number of navigation satellites available to the users. GNSS Integrity Channel (GIC): Broadcasting of integrity information. This will increase the availability of GPS/GLONASS/EGNOS navigation service performance, mainly its accuracy, up to the NPA Wide Area Differential (WAD): Broadcasting of differential corrections. This will increase the GPS/GLONASS/EGNOS service performance, mainly its accuracy, up to the level of PA

30 Page 30 METIS First Master Training & Seminar, Ifrane (Morocco), EGNOS Performance for Civil Aviation  Compliant for the En-Route Phases of Flight – Global availability better than % (assuming GIC/RAIM combination)  Compliant for the NPA Phase of Flight – Global availability better than % (assuming GIC/RAIM combination)  Provision of Precision Approach –Objective: to achieve APV-2 (VAL=20m) (Global Availability of 99%)

31 Page 31 METIS First Master Training & Seminar, Ifrane (Morocco), EGNOS Safety of Life Service (SoL)  Must stringent level of signal in space performance to all Communities of Safety of Life users over Europe  Accessible to any user equipped with a GPS/SBAS compatible receiver  Compliant with aviation APV-I intended to support applications in other SoL domains  Should be declared available following appropriate certification process

32 Page 32 METIS First Master Training & Seminar, Ifrane (Morocco), Actions System Evolutions Deliver system Certify operations for SoL Commercial service upgrade Extend to Mediterranean System Evolutions Deliver system Certify operations for SoL Commercial service upgrade Extend to Mediterranean Services Open Service Commercial Service Safety Of Life Service Services Open Service Commercial Service Safety Of Life Service Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Open Service Readiness Safety Service Readiness Commercial Service Readiness EGNOS Service Implementation Roadmap

33 Page 33 METIS First Master Training & Seminar, Ifrane (Morocco), GPS and GEO Augmented Navigation (GAGAN)  Spearheaded by ISRO and Airport Authority of India  Eight reference stations  The control centre and satellite uplink centre are located in Bangalore  Shall support NPA and Cat 1 landing  Should be operational in 2006

34 Page 34 METIS First Master Training & Seminar, Ifrane (Morocco), Open Service Access - Free to air, Mass Market, Simple positioning - Commercial - Encrypted, High accuracy, Guaranteed service - Safety of Life - Unencrypted, Integrity certified GALILEO Service

35 Page 35 METIS First Master Training & Seminar, Ifrane (Morocco), Search and Rescue - near real-time, precise - Public Regulated - Encrypted, Integrity, Continuous availability GALILEO Service (continued)

36 Page 36 METIS First Master Training & Seminar, Ifrane (Morocco),  The EGNOS programme should be placed under the control of the GALILEO Joint Undertaking  Inclusion of EGNOS management as part of the future GALILEO concession to be assessed  EGNOS should receive public funding from different sources  EGNOS should be certified for safety of life use (eg aviation) as soon as possible  Improvements should be made in order to meet evolving international standards  EGNOS extensions should be pursued to share its operation with other regions (eg MEDA) EU Council Conclusions

37 Page 37 METIS First Master Training & Seminar, Ifrane (Morocco), Thank You!


Download ppt "Page 1 METIS First Master Training & Seminar Galileo/EGNOS and GPS & Augmented/Differential GPS Prepared by Mamadou Traore GEMCO"

Similar presentations


Ads by Google