Minutes of the SBAS Interoperability Working Group (IWG) Meeting #25
Venue:SOKOS(St. Petersburg, Russia)
Date / Time: June25th to 27th2013
Participants: see list below
Co-Chairmen: Didier Flament (ESA) / Deane Bunce (FAA)
Secretary: Felix Toran (ESA)
Meeting Agenda
See detailed meeting agenda annexed at the end of these MoM
List of participants
NAME / COMPANY / EMAIL ADDRESSBUNCE Dean / FAA /
BURNS Jason / FAA /
ALEXANDER Kenneth / FAA /
WALTER Todd / Stanford /
BLANCH Juan / Stanford /
LEJEUNE Roland / MITRE Corporation /
ShripathiVenkatram SATISH / ATM GAGAN /
Lingamaneni Sri Rama MOHANA RAO / GAGAN /
Ashok Kumar BHARDWAJ / Civil Aviation India /
KARUTIN Sergey / Russian Space Systems /
SHERENOV Alexander / Russian Space Systems
NIKITINA Margarita / Russian Space System /
ISAEV Yury / Russian Space System
BAKEEV Amir / Russian Space Systems
KAPLEV Sergey / Federal State Unitary Enterprise TSNIIMASH
OLEG Zavalishin / LLC « NPPF Spectr » /
IWASHITA Nobuchika / JCAB/Japan /
OCHIAI Shinichi / JRANSA/Japan /
SAKAI Takeyasu / ENRI/Japan /
BELLINGHAM Steve / NAV CANADA /
FLAMENT Didier / ESA /
HEIN Guenter / ESA /
TORAN Felix / ESA /
THOMAS David / ESA /
BROCARD Daniel / ESA /
SAMSON Jaron / ESA /
JEANNOT Marc / ESA /
LOPEZ Carlos / ESA /
BULSA Gerard / ESA /
DENIS Jean-Christophe / ESA /
HOGREL Martine / ESA /
MELINOTTE Jean-Manuel / ESA /
LAM Juan Pedro / ESA /
BOULANGER Cyrille / ESA /
JIMENEZ David / ESTEC /
SCHLUETER Stefan / ESA/DLR /
SOLARI Giorgio / ESA /
ERHARD Philippe / ESA /
SALABERT Francisco / EUROCONTROL /
CHATRE Eric / EC /
ROTURIER Benoit / Aviation Civile /
PUJOL Sylvain / Aviation Civile /
ANTREICH Felix / DLR /
LACARRA E. / ESSP /
BILLOT Angelique / ESSP /
CARRAZ Flavien / ESSP /
ROLDAN Roberto / ESSP /
SUARD Norbert / CNES /
SECRETAN Hugues / CNES /
MARGERY Michel / CNES /
ZOBLER Dominique / CNES /
List of input material
The list below presents all the input material to the SBAS IWG meeting #24. All the material mentioned below can be downloaded through the following URL:
ftp://epo-14r:ePo!04!
- EGNOS Program Update slides(EGNOS V2 Program update - IWG#24.ppt)
- WAAS status update (IWG 24 WAAS Status Brief 012313.ppt)
- Video Interview with NAC CEO David Karp.
- MSAS status debriefing slides (20130121-MSAS_IWG#24-rev2(Iws)-Mod.pptx)
- SDCM status presentation slides (SDCM 22 Jan 2013 EN .pptx)
- GAGAN status (IWG 24 - India.pdf)
- EGNOS LPV implementation in Europe (20130123_IWG24_LPV_Implementation-ESSP.ppt)
- Open Service Guidelines debriefing slides (EGNOS open service guidelines for receiver manufacturers IWG_v2.pptx)
- Protection of users out of Service Area slides (integrity out of SA - presentation EC+ESA EPO.ppt)
- ESA R&D Program Update presentation slides (ESA EGEP Program - Achievements 2012 and Extension program 2013-2015-final.ppt)
- SQM User Errors slides (SQM - presentation ESA EPO + DLR.ppt)
- Characteristics / Models of GNSS signal distortions and anomalies (GPS block IIF, PRN25). (DLR_PRN25_GPS_IIF_anomalies_f.pptx)
- L5 signal deformations presentation slides (SQM for DF WAAS_FAA update_Nov_2012_r7_IWGmodJan2013.pptx)
- EGNOS Performance and Operational Implementation Status (ESSP-MEMO-8634_IWG24_EGNOS_Performance_01-00.ppt)
- Ionospheric activities: Analysis results and planned activities (schlueter-IWG_SBAS_Toulouse-Iono.pptx)
- Report on SBAS Iono Working Group (Walter_IWG24_SIWG_Update.pptx)
- Quick Facts: Worldwide SBAS (SBAS_Qfacts_01222013.pdf)
- SBAS Frequently Asked Questions DRAFT (SBAS FAQs DRAFT_20130108.doc)
- Global SBAS Status (SBAS Global Status Brief_20130123.ppt)
- EGNOS service introduction (EGNOS presentation IWG jan 2013.ppt)
- EGNOS Coverage Extension Plan and New Mission Requirements (EGNOS V3 MRD.ppt)
- DFMC Work Plan Update (DFMC Work Plan_US.ppt)
- DFMC Receiver Fallback Modes Progress Report (DFMC_receiver_fallback_modes_IWG24_Jan_2013.pptx)
- DFMC Definition Document Outline (DFMC Outline_US_v5.ppt)
- RTCA debriefing (RTCA_SC-159_WG2_summary_IWG24_Jan2013.pptx)
- Summary Comparison SBAS L1/L5 ICD Models (ICD presentation EC+ESA EPO.ppt).
- L1/L5 SBAS MOPS to Support Multiple Constellations (walter L1L5 SBAS MOPS IWG24 Jan 2013.ppt)
- Invitation to the IWG#25 meeting (video.rar)
- GPS / GLONASS Multiconstellation SBAS Trial (IWG24_ENRI_MC-SBAS.ppt)
DAY 1
Welcome
M. Pircher (Director of CNES Toulouse Space Center) welcomed participants to CNES and wished a fruitful meeting. D. Flament and D. Bunce introduced the IWG meeting.
Approval of agenda
The agenda was approved (see annex).
EGNOS Status (Presented by D. Flament)
The architecture of EGNOS is presented, followed by the release plan of EGNOS, from v2.2-ext (the first certifiable release of EGNOS) until future V2.4.2. The current version in operation is V2.3.1i, with important improvements in term of iono robustness. V2.3.2 will be qualified in June 2013 and entering operations in August 2013. Following release will be V2.4.1M, to be qualified in June 2014. It will include mission evolutions as MOPS D compliance, LPV200 service, plus resolution of obsolescence issues and other important features. Four RIMS are still to be deployed (up to a total of 41). Part of them are planned to be deployed through V2.3.2 (see slides [1]).
The CDR of V2.3.2 has been passed, and V2.4.1M CDR is under preparation.
The Luch 5B satellite (SDCM) is collocated with EGNOS GEO PRN 120. This possible interference issue is under discussion.
A comparison of performances between version 2.2 and 2.3.1i for a same day shows a clear improvement with v2.3.1i. Another comparison using a known day with an underperformance shows the important performance improvements obtained from v2.3.2. Performances observed today in the system are nominal.
In terms of GEOs, ARTEMIS is used for test. ASTRA-4B acceptance is expected by mid 2013, to be used for test and then for operations in 2014.
The coming two years are transition ones, towards a new framework for 2014-2020. A Phase B for extension of EGNOS L1 service over Africa (South Africa and ASECNA) is pending EC decision.
It is clarified that, for the new RIMS (to resolve obsolescence issues), it is still under discussion if they will be based on new or existing hardware.
It is clarified that ESA is planning to collect data in Africa during solar peak, through ESA activity called MONITOR. In addition, a CNES activity will deploy stations in Africa to feed ESA with further data.
See slides [1] for more details.
WAAS/GPS Status presentation (D. Bunce)
38 reference stations (no plan to add more in the short term).
Currently in phase IV, dual frequency L1/L5 operations (2014-2018). Transition from L2 to L5 will be completed through this phase. The single frequency SBAS service will be maintained.
Four releases throughout phase III, including improvements iniono robustness.
Three GEOs are in use currently: CRW, CRE and AMR. GEO 5 is expected to be in the system by 2015, GEO 6 in 2018 and GEO 7 in 2019. LPV coverage includes US, Canada and Mexico. Performance has improved thanks to implementation of Kriging method.
It is considered by the group that a risk exists on the timely deployment of Block IIF satellites. In order to validate the system, WAAS needs 18 satellites available. In case of delay in GPS constellation deployment, the group overall opinion is that the MOPS development should not be delayed as a consequence.
Simulations show that transition from L2 to L5 should be done when there are 24+ satellites. Doing it before would mean a degradation of performance.
Next generation receiver (G-III) is under development (to be completed in 2013). WAAS safety computer (supporting dual frequency upgrades and adding significant new capabilities) initial production will take place in 2013.
In terms of approaches, near 3500 LPV approaches published. Outreach initiatives continue to grow, with NOrther Air Cargo, Bell helicopters, CapeAir, Care Flight and FAA citations, Horizon, Express Jet, etc.
In terms of extension to South America, discussions are ongoing, but nothing has been formalized at this time.
A video interview with Northern Air Cargo CEO was projected, showing Boeing fleet equipped with WAAS and reporting on the different benefits including safety, fuel saving, etc.
See slides [2]and video [3] for more details.
MSAS Status debriefing (Presented by Nobuchika Iwashita)
Basically, there is no change in status of MSAS since last IWG meeting. 2014 is a decision making year concerning the future replacement of MTSAT satellites.
MSAS is used in regional air carriers, fire fighting, medical helicopters, etc.
QZSS status is also reported. It is managed from a different organization than MSAS. It is still to be concluded (by end of March 2013) whether QZSS will provide or not an SBAS service.
See slides [4] for more details.
SDCM / GLONASS Status debriefing (Presented byS.Rybkin)
The system is under development. There are international activities, including possible areas of cooperation with WAAS and MSAS, and participation to IWG.
Full coverage with GPS L1 only augmentation is planned in 2015 and with dual frequency in 2018. The level of service will be LPV-200.
Certification process will start with the coverage of central area of Russia. By 2018, the plan is to have L1/L5 GPS and L1/L3 GLONASS signals used. The target is LPV-200 service.
Three L1 GEOs, one L1/L3/L5 GEO and SISNeT are the broadcast means. The system will have 40 reference stations, with up to 7 along the Russian borders.
Luch 5A and 5B are operational.Luch 5V expected to be operational in 2014. Performance maps show some degradation in the South, due to the lack of stations.
SDCM is cooperating with EGNOS, with an SBAS efficiency study for Eastern Europe and market development activities in the context of EC 7th Framework Program.
The concept of dynamic PRN mask will be implemented during the second part of the project.
See slides [5] for more details.
GAGAN Status Debriefing
Since December 2011 GAGAN SIS is available on PRN127 for testing and evaluation. The ground segment of GAGAN system architecture is in place with 15 Indian Reference Stations (INRES), 2 Indian Master Control Centers (INMCC) and 3 Indian Land Uplink Stations (INLUS).
A communication network comprising of four circuits, using terrestrial / space media is being established for GAGAN to ensure 99.999% availability. Final System Acceptance Testing was successfully completed on 16th and 17th July 2012.
GAGAN system functions in the equatorial ionosphere region wherein the spatial and temporal variability is high and therefore India has developed necessary Ionosphere model specifically for this region. IGM-MLDF (Ionospheric Grid Model – Multi Layered Data Fusion) model has been implemented for GAGAN system.
The Space segment of GAGAN system comprises of 2 operational GEOs ( GSAT-
8/PRN 127, GSAT-10/PRN 128) and one GEO as in-orbit spare (GSAT-15), to be
launched in 2015.
GSAT-8 satellite (PRN 127) is operational for non-safety critical applications since
December 2011. GSAT-10 (PRN 128) is undergoing system integration and its
services will be available after February 2013.
The FSAT test results and thereafter GAGAN system performance has been continuously
monitored and data is collected for various analysis including HMI. Sample results are shown to
demonstrate the GAGAN system performance parameters are within the specified limits for
nominal day operations.
MITRE is supporting the GAGAN certification activities.GAGAN will be certified for APV-I.
Since GAGAN fills the coverage gap between EGNOS and MSAS, India urges IWG to provide assistance to detect any interoperability issue, especially with EGNOS.
For more details, see slides [6].
GAGAN is in its final operational phase. GAGAN covers 70% of Indian territory due to constraints for siting Reference stations outside its homeland, yet has extension capabilities to other regions, as Africa, Australia, etc.
LPV Implementation Status (E. Lacarra)
The different EGNOS services are presented (Open Service, Safety of Life and EDAS).
A SoL Service Definition Diocument was published on March 2011. EGNOS service notices are generated by the operator. A contingency communication plan has been agreed with EUROCONTROL, DSNA and EASA.
An example of a SoL service degradation affecting some airports at the North of Germany and the NOTAM proposals sent was shown.
EGNOS Working Agreements (EWAs) with DSNA, Skyguide, Guernsey Airport, DFS, ENAV, NAATS, Austrocontrol and AENA signed.
F. Salabert presents the EUROCONTROL One Sky online PBN approach map tool. There are 1.536 airports in Europe. Today there are 49 implemented LPV approaches. The plan for the next 5 years is to arrive (in 2018) to 377 published procedures.
See slides [7] for more details.
Open Service Guidelines Document (D. Jimenez, ESA)
Open service guidelines for receiver manufacturers have been developed by ESA, in coordination with EC. Open service focuses on accuracy and availability, so the goal is to improve those performance parameters and simplify as much as possible the algorithms with respect to the DO 299D, which is focusing on SoL.
Four axes of improvement have been studied: combination of subsets of corrections, combination of corrected and uncorrected satellites, new iono interpolation method and extension of the correction update rate.
The Open Service guidelines document report is available to IWG members interested.
E. Chatre explains that a number of receiver manufacturers which may benefit from these guidelines have been identified by European Commission. A list of guidelines will be elaborated, and this document prepared by ESA has been a key contribution. Today there is an SDD document for Open Service that should be updated in the future to include receiver guidelines.
See slides [8] for more details.
LPV200 Requirements Interpretation (E. Chatre / F. Salabert)
E. Chatre introduces the topic. ICAO guidance material on LPV-200 has led to some ambiguous interpretations for the different SBAS systems. Stanford University produced a paper on interpretation of LPV200 requirements.
Additional work is found needed to arrive to clarify the interpretation of the guidance material. EUROCONTROL has performed flight testing to support this. FAA is also performing simulations. Those simulations will feed the next NSP meeting for conclusion on the topic.
When the outcome of FAA simulations is available, a paper will be prepared as input to NSP to capture the result.
SBAS Continuity Way-Forward and Harmonization (F. Salabert, EUROCONTROL)
Following iterations at IWG level since 2010, an ICAO Working Paper was prepared and presented to NSP by mid 2012. Three comments were received and have been discussed at IWG #24:
- “Number of available samples” need to be defined more clearly. Considered that an available sample is when the PL can be computed and PL<AL.
- Minimum period to compute continuity (so that the agreed method can be used to show compliance to continuity requirement) is discussed. The working group is not able to define a duration, but it is considered reasonable that it must be longer than one month.
- It is clarified that the step of the sliding window is one second.
- The receiver implementations are based on instantaneous receiver switching between both GEOs to avoid having a continuity event.
- Reference to MT63 removed.
- Concerning NOTAM, the correct reference to ICAO material has been introduced, as requested by NSP.
The paper will be edited and circulated for final comments.
ACTION A1: F. Salabert to edit the Continuity Working Paper according to discussions and circulate it to the group for final comments.
Protection of users out of the service área (E. Chatre / D. Brocard)
D. Brocard sets the context by presenting (see [9]) how users are protected in EGNOS V2 and V3.
In EGNOS V2, the use of MT27 ensures protection out of ECAC.
EGNOS V3 is moving towards using MT28. This provides protection inside ECAC. Yet integrity for out of ECAC (indeed within the GEO footprint) may not be guaranteed unless specific protection is implemented.
The questions are:
- Does EGNOS need for SBAS to protect (by themselves) users out of service area for PA and NPA operations?
- In case of having to protect users out of service area, how to minimise extra system complexity and performance regression inside service area?
Eric Chatre presents the EU point of view (see [9]):
- For PA, only published procedures can be flown (so only PA procedures within the service area will be selectable by aircraft avionics). Therefore, no need for the SBAS to protect users out of the service area.
- For en-route to NPA, there is no implicit mechanism to protect users out of service area. Therefore, such protection needs to be provided by the SBAS system.
The EGNOS view on protection of users out of SA is shared by WAAS and the group. WAAS is not using a concept of service area, since they use MT28.
WAAS has implemented an “a priori” approach for MT28 to demonstrate protection of the users out of service area (CONUS), which is certified. There is a technical commitment of protection beyond CONUS for WAAS (based on MT28) , even though itdoes not have legal status and all relevant liabilities are disclaimed outside the service area as they will have to be borne completely by the country concerned.
SDCM informs that there are no plans defined to implement MT28 in their system.
ESA R&D Program Update (D. Thomas)
D. Thomas introduces EGNOS V3 and the expected performances in the future, towards a global coverage through interoperability with other SBAS systems. Phase A activities were concluded (two parallel consortia). Two parallel phase B activities with two consortia have been procured, with an SRR milestone expected by mid 2013 and PDR in 2014.
EGNOS V3 is accompanied by several experimentation activities (test beds): High integrity test bed, ARCTIC test bed, Multiconstellation Regional System test bed. Several technology predevelopments are ongoing. An experiment with GATE (helicopter trials) has been successfully performed.
See [10] for more details.
SQM User Error (F. Antreich / D. Brocard )
D. Brocard introduces the context. The preliminary analysis presented at IWG#22 is recalled. That analysis was preliminary and had some limitations which are intended to be covered through the following EPO/DLR activity .
F. Antreich presents the results of the analysis performed by DLR. A 30m dish antenna has been used by DLR.
First nominal analog and digital distortions have been measured on one SV block IIF for both L1 and L5 signals.
Then models have been tuned in order to match the observed distortions. Some further work remains however to be performed especially on L5 model.
Finally impact of distortions on on user error was (roughly) estimated as a function of the differential design between User and System receivers characteristics.
Way forward: