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Presentation on theme: "ICAO AFI GNSS ITF 1st MEETING Dakar, 17-18th November ZONE A TRIALS"— Presentation transcript:

1 ICAO AFI GNSS ITF 1st MEETING Dakar, 17-18th November 2003 ZONE A TRIALS
Joint presentation by . Hughes Secrétan (ESA) . Patrick LEFEVRE (ASECNA) Zone A GNSS/EGNOS Trials

2 The Plan adopted by AFI States contains:
ICAO : GNSS AFI POLICY The ICAO Africa and Indian Ocean (AFI) Regional Implementation Plan includes a GNSS strategy Plan The Plan adopted by AFI States contains: Phase 1( ): use of GPS implementation of an AFI GNSS test bed (extension of the EGNOS test bed) and preparation for the implementation of an operational system Phase 2 ( ): operation of SBAS (EGNOS extension) for en-route to APV-I (Approach with Vertical Guidance) capabilities Phase 3 (2012-…) : operation of SBAS with CAT-1 capabilities (Precision Approach), relying upon the availability of a civil satellite constellation (e.g. GALILEO) In summary, the EGNOS Project is now quite well engaged into the development effort, the first hardware elements are to be delivered in early 2002. The key challenges for the coming months in the completion of the design phase, with the system critical design review, which is a major step in the demonstration of the outstanding navigation perfomance that can be achieved by this system. Then site survey, preparation and hardware software integration activities will be the focus of our project effort along year 2002. At program level, the EGNOS Operational framework will be further defined, towards clarified institutional organisation for the post-ORR activities. We must realise that the European experience still to be gained up to the successful introduction of EGNOS service is still very important, that further supports may have to be made by the public sector. Succesful introduction of EGNOS Service is likely to be a key success criterion for the GALILEO programme, and for the European credibility with respect to the non-European partners in its ability to complete its strategic undertakings. This conclude my presentation, and I thank you for your attention. Zone A GNSS/EGNOS Trials

3 GNSS test-bed trials objectives
To verify the navigation performances over selected areas and airports of western and Central Africa, To analyze ionospheric impacts, To evaluate critical issues (telecommunication network, expansion mode, airborne receivers performances,…) To validate the EGNOS simulation model outside Europe, To evaluate APV1 procedure design, constraints and operations To sensitize potential services providers and users, To develop expertise in the view of the implementation of the AFI test bed and an operational system Zone A GNSS/EGNOS Trials

4 AFI Test Bed implementation in Zone A
Implementation of a Test Bed in Central Africa (zone A), in line with the ICAO Strategy (Phase I) from December 2002 to september 2003. Project with no exchange of funds Links between the RIMS and ESTB based upon AFISNET satellite communication network 4 RIMS installed by ASECNA at N’Djamena, Lomé, Douala and Brazzaville VPL Simulation ( ESA source) N’Djamena Lomé Douala Brazzaville Zone A GNSS/EGNOS Trials

ESA (European Space Agency) : provided one ECUREV RIMS and CPF modification to manage the Dakar RIMS, ASECNA : provided facilities for the RIMS, its EGNOS equipped calibration aircraft, APV1 design procedure French DGAC : provided the airborne navigation software and data analysis support, Eurocontrol : supplied the PEGASUS software for data acquisition and processing, ENAV, the Italian Space Agency loaned 3 RIMS to ASECNA through ESA. NAMA (Nigerian Airspace Management Agency) , which provided data for APV1 procedures design, support for the flights and organized demonstrations in Lagos, Kano and Port-Harcourt,    Zone A GNSS/EGNOS Trials

6 Zone A GNSS test bed architecture
INTELSAT INMARSAT GPS signals GPS RIMS data to CPF EGNOS navigation Message (integrity and corrections AFISNET TOULOUSE HONEFOSS (NORVEGE) VSAT ASECNA Ranging +GES ESTB CPF N’Djaména RIMS and VSAT Lomé :Rims and VSAT CPU CPU Douala : RIMS and VSAT Thales Router Thales Router Honefoss Zone A GNSS/EGNOS Trials Brazzaville : RIMS and VSAT

RIMS Antenna location Interferences issues Connexions to communication network No spares Lack of documentation No central monitoring No FTP server Not an operational system Management Zone A GNSS/EGNOS Trials

8 GPS/GEO antenna (Novatel)
RIMS layout GPS/GEO antenna (Novatel) Screen 15’’ Power Supply PC Processor Unit GPS/GEO Novatel OEM3 L1/L2 Receiver DAT Recording Unit Rubidim Atomic Clock Keyboard IP Router Local Maintenance Equipment SYNC DAT Core RIMS Computer Receiver DATA RIMS DATA Atomic Clock NETWORK IP Router Zone A GNSS/EGNOS Trials

9 GNSS expected performances: vertical accuracy
Zone A GNSS/EGNOS Trials

10 GNSS expected performances : VPL Availability
Zone A GNSS/EGNOS Trials

11 EGNOS raw data collection
ATR42 Avionics layout GPS/Glonass Antenna GPS/Glonass Antenna GPS Antenna RTK Receiver TBUE Receiver Novatel Receiver Honeywell Receiver Flight Management System (FMS) Navigation sensors Calibration computer Guidance computer * Data collection computer Tracking data (to Pegasus) EGNOS data (to Pegasus) EGNOS EFIS Cockpit Electronic Displays EGNOS guidance sub-system EGNOS raw data collection sub-system Aircraft Navigation System Airborne Calibration sub-system Existing equipment in the ATR42 equipment provided by ESA New equipment acquired and installed by ASECNA Zone A GNSS/EGNOS Trials

12 ATR42 GNSS Avionic layout (pictures)
ADAGIO cabin display EGNOS cockpit guidance display (EHSI) Zone A GNSS/EGNOS Trials

13 Final Approach procedures
16 m 220 m 20m Horizontal plane MDH ( 250 ft) 16 m MAPT 8 m 250 ft 200 ft Slope 5.2% (3°) Runway APPROCH CATEGORIES CAT I APV2 APV1 NPA Horizontal 16 m 16 m 220 m Accuracy Vertical 4 à 6 m 8 m 20 m Not applicable Horizontal 40 m 40 m Alarm Limit Vertical 10 à 15 m 20 m 50 m Not applicable DH/MDH (mini) Vertical 200 ft 200 ft 250 ft 250 ft With Land. lights 550 m 550 m T.B.D 1200 m Horiz. Visi. (mini) Without Land. lights 1000 m 1000 m T.B.D 1800 m reduced (ILS) near ILS Important => Mimima if obstacles near ILS Protection areas Slope 5.2% (3°) Descent + stabilization => CFIT risk 5.2% (3°) 5.2%(3°) Integrity/continuity of service yes yes yes not Zone A GNSS/EGNOS Trials

14 DOUALA RWY 30 APV1 Instrument Approach Chart
Zone A GNSS/EGNOS Trials

15 APV1 benefits (1) Control of the vertical position thanks to the EGNOS signal and added descent fixes No more flat step before the miss approach point (see point V) reducing CFIT (Controlled Flight Into Terrain) risk Reduced operational minima Ease of flyability Zone A GNSS/EGNOS Trials

16 APV1 benefits (2) Zone A GNSS/EGNOS Trials

17 GNSS ESTB Horizontal Guidance
Guidance signals provided by ESTB navigation system are similar to actual ILS deviations. Dakar ILS Localizer error (mA) against distance to threshold (NM) ILS Cat I Template ESTB Lateral angular error (mA) Zone A GNSS/EGNOS Trials

18 GNSS/ESTB Vertical Guidance
Dakar ILS Glide error (mA) against distance to threshold (NM) and ILS Cat I Template ESTB Vertical angular error (mA) Conversion of the constant linear Vertical ESTB error into angular Error (blue line) Impact of trajectography Path model (red line) Vertical guidance signals provided by ESTB are close to ILS Glide deviations and available on all Runways Zone A GNSS/EGNOS Trials

19 Zone A preliminary results : accuracy (1)
Zone A preliminary results : accuracy (1) Horizontal error (HPE) Vertical error (VPE) Date GEO Period Mean 95% Mean 95% 16/09/03 120 Day 1.67 3.30 -0.43 4.21 16/09/03 120 Night 1.33 3.23 0.69 4.49 17/09/03 131 Day 1.31 2.74 -0.14 4.37 17/09/03 131 Day 1.43 3.66 1.24 4.97 18/09/03 120 Day 1.53 3.08 -0.08 4.25 18/09/03 120 Night 1.31 3.06 0.59 5.05 131 Day 1.08 2.41 -0.93 4.59 19/09/03 20/09/03 131 Day 1.27 2.61 -0.93 4.59 22/09/03 120 Day 2.37 3.99 -1.08 4.31 22/09/03 120 Night 1.93 4.71 -0.80 5.58 Zone A GNSS/EGNOS Trials

20 Zone A preliminary results : accuracy (2)
Accuracy performance, when full corrections are broadcast, is complying with the APV1 SARPS requirements with HPE around 3m (95%) and VPE around 4.5 m (95%) Zone A GNSS/EGNOS Trials

21 Zone A preliminary results : availability (1)
Full corrections Date PRN Period Hor. APV1 Vert. APV1 16/09/03 120 Day 77.34% 75.64% 75.82% 16/09/03 120 Night 85.99% 84.60% 83.81% 17/09/03 131 Day 95.47% 93.85% 91.91% 17/09/03 131 Night 99.05% 97.97% 98.66% 18/09/03 120 Day 93.96% 92.14% 91.41% 18/09/03 120 Night 96.16% 94.93% 93.95% 19/09/03 131 Day 98.52% 97.37% 96.91% 20/09/03 131 Night 100% 100% 100% 22/09/03 120 Day 92.11% 88.71% 89.07% 22/09/03 120 Night 94.90% 93.23% 92.56% Zone A GNSS/EGNOS Trials

22 Zone A preliminary results : availability (2)
Note : results obtained with the FAA tool : SISAT Zone A GNSS/EGNOS Trials

23 Zone A preliminary results : availability (3)
Numerous causes of unavailability : Telecommunications outages or malfunctions, (N’Djaména, Brazzaville, Toulouse), interferences issues (N’Djaména and Douala ?), RIMS mains failure (N’Djaména), RIMS malfunctions destruction of GNSS antenna at Douala from lightning, Erroneous RIMS re-configurations after re-starts (Brazzaville, N’Djaména and Douala), Ionospheric effects RIMS HMI ( human machine Interface ) miss designed for local maintenance purpose Zone A GNSS/EGNOS Trials

24 Zone A preliminary results : availability (4)
When the ESTB signal is providing full corrections (fast corrections + iono corrections), the HPL/VPL availability for APV1 is roughly 98.5% (between 97% and 100%). APV1 service availability is better during night then day, most probably due to ionosphere effects, in particular the GIVE that is smaller during night. The improvement of the quality of the RIMS and communications lines, which are generating some gaps and time-delay may improve significantly the ESTB performances Zone A GNSS/EGNOS Trials

25 Zone A preliminary results : availability (5)
The service availability on AFI-A area is mainly affected by 2 phenomena: Don’t use IGP’s events (GIVE set to “don’t use”). Such GIVE status may be explained by a high ionosphere activity. More static tests would be very useful to monitor the ESTB iono corrections, understand and optimize the CPF configuration regarding such iono activity. A dedicated iono receiver is under installation at Douala,  UDRE set to “not monitored by the CPF. Most of the satellites located in the South part of the region have an UDREI of 14 (not monitored) and are therefore not used in the navigation solution. It needs to be investigated in more details as it prevents quite a significant amount of satellites from being used. Zone A GNSS/EGNOS Trials

26 ZoneA preliminary results: S.I.S (Hor.) Integrity (1)
Zone A GNSS/EGNOS Trials

27 ZoneA preliminary results: S.I.S (vert.) Integrity (2)
Zone A GNSS/EGNOS Trials

28 ZoneA preliminary results : integrity (3)
As shown in the previous diagrams, no misleading information (non integrity events) happened during all the static tests. Zone A GNSS/EGNOS Trials

29 Flight tests and demonstrations (1)
Extensive flight tests and demonstrations were performed in; Lomé (Togo) Lagos, Kano and Port-Harcourt (Nigeria) Malabo (Equatorial Guinea) Libreville (Gabon) Douala and Yaoundé (Cameroon) More than 100 persons including pilots, African Civil Aviation Authorities and Air Forces representatives flew aboard the ATR42. GNSS presentations were carried at every airport (except Malabo). Zone A GNSS/EGNOS Trials

30 Flight tests and demonstrations (2)
All the FAS data (Final Approach Segment) prepared for the APV1 procedures were right On all the flown approaches, the runway axis alignments were well within the CAT1 tolerances (and APV1). Regarding the descent path it was found on two airports a difference of about 50 ft at the threshold. Investigations are on-going to determine the cause. Zone A GNSS/EGNOS Trials

31 RIMS installation recommendations
Training of technical staff is necessary to handle maintenance operations Site survey in compulsory in order to minimise installation delays ( interference effects, length of cable between antenna and Rims, etc…) RIMS alimentation must be on unbreakable power supply Connection to ground network ( réseau de terre) must be necessary done with appropriate cable Access to telecommunications network must be done either by V24 link or by IP link using frame relay multipliers equipments. Zone A GNSS/EGNOS Trials

32 Conclusions Preliminary results show EGNOS may satisfy AFI navigation requirements contained in the GNSS AFI Strategy, Hardware, software and operation procedures constituting the test-bed have to be improved to significantly increase the ESTB performances, Training and expertise of AFI staff about GNSS evaluation is mandatory, Complementary evaluations have to be made in equatorial region ( either by extension of zone A trials or through extensive zone C evaluation). Zone A GNSS/EGNOS Trials

Zone A GNSS/EGNOS Trials

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