Navigation System Panel (NSP)
Summary of Recent Meetings
SBAS IWG #26 Meeting
Delhi, India
5-7 February 2014
Roland Lejeune
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Introduction
 One NSP meeting took place since IWG/25:
– November 12-21, 2013
 Agenda items
– Panel organization and work program
– Core constellations and SBAS standards and guidance material
– GBAS standards and guidance material
– Conventional Navigation Aid standards and guidance material
– Spectrum issues
– Operational implementation issues
 This briefing reports mainly on SBAS-related discussion
– However, some information is provided on a few other topics
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Panel Organization
 Air Navigation Commission (ANC) is working on a re-organization

of panels
– Request for consolidation of ICAO technical groups from 12th Air
Navigation Conference (Nov. 2012)
– Objectives: improved alignment between panels and work program,
and improved coordination among panels
– Decision expected to be made soon, but no deadline announced
Potential impact on Navigation Systems Panel (NSP)
– Spectrum area may be moved to a new Spectrum Panel in which all
spectrum related issues would be consolidated
– Performance Based Navigation (PBN) work may be moved to NSP
renamed simply Navigation Panel
 Some open issues remained in PBN guidance material when the PBN
Study Group disbanded, and these issues are currently slowing PBN
implementation in some States
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Work Program (1 of 2)
 ANC assigned 9 “Job Cards” to NSP
– Job Cards describe new work to be undertaken, including high-level
tasks and delivery schedules
 Job Card concept is being instituted to facilitate ANC review of progress
 Job Cards were not requested for existing work
– So, on-going tasks will continue (without Job Cards)
 Maintenance of existing standards and guidance material (GNSS and
conventional radio navigation aids)
 Standardization of Galileo and BeiDou core constellations
 Maintenance of GNSS Manual (Doc. 9849) and Manual on Testing of
Radio Navigation Aids (Doc. 8071)
– All 5 Job Cards prepared by NSP during March 2013 meeting, plus
one prepared by the Secretariat, were assigned to NSP, but the
“GNSS evolution” Job Card was split into 4 separate Job Cards
 See next page
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Work Program (2 of 2)
 Job Cards assigned to NSP
1.
2.
3.
4.
5.
6.
7.
8.
9.
Maintenance of Navigation Roadmap
GNSS Evolution - Multi-constellations
GNSS Evolution – SBAS
GNSS Evolution – Advanced Receiver Autonomous Integrity
Monitoring (ARAIM)
GNSS Evolution – GBAS
GNSS Radio Frequency Interference
Mitigation of Space Weather Effects
Rationalization of terrestrial navigation aids
Alternative Position Navigation and Timing (APNT)
© 2014 The MITRE Corporation. All rights reserved.
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Core constellation standards
 GLONASS
– GLONASS status and observed performance
– Update to the coordinate system (PZ-90)
– Approval of a SARPs change on resistance to interference
 Corresponding to a similar change in GPS/SBAS SARPs
 BeiDou
– BeiDou status
– Initial draft SARPs material for B1I signal (1561 MHz)
 Further information on use of BeiDou signals requested in order to
determine whether B1I needs standards for international aviation
 Galileo
– Galileo status
– Initial draft SARPs material for E1 and E5a signals
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SBAS standards (1 of 2)
 Proposed changes to SBAS SARPs for consistency with SBAS
user receiver MOPS, DO229D, Change 1
– Approval of change package containing 24 changes to reconcile
requirements in SARPs with those in avionics MOPS
 Change should be reflected in Amendment 90 applicable in Nov. 2015
 Proposed change to Table 3.7.2.4-1 on signal-in-space
performance
– Approval in principle on two proposed new notes to (1) declare
APV-II non-applicable to SBAS and (2) clarify that SBAS can be
used for LNAV/VNAV operations
 Exact wording still to be agreed
 Approval in principle will be used for coordination with Instrument Flight
Procedure Panel (IFPP) which had commented on difficulties created by
APV-II and lack of LNAV/VNAV lines in Table 3.7.2.4-1 for their work
– IFPP is responsible for developing PANS OPS (Doc. 8168)
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SBAS standards (2 of 2)
 RTCA SC-159 WG2 report
– Decision to start gathering data on dual-frequency, multiconstellation SBAS signal-in-space and concept of operation
 RTCA/EUROCAE “score card”
– On-going effort to document information needed from core
constellation providers to support the development of avionics
MOPS, and the information that is available
 Expect completion for GPS and Galileo by end of 2013
 Requested help from Russian and Chinese colleagues for GLONASS
and BeiDou to complete the score card
 IWG progress
– Analysis of two options for message structure is expected to
converge to a consolidated structure in Spring of 2015
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Multi-constellation GNSS (1 of 2)
 Service provision in the multi-constellation context
– Observations on provision of air navigation services (as per Chicago
Convention) and provision of core constellation services
 Need for some form of augmentation (e.g., RAIM) to achieve integrity
requirements
 Need for cooperation between core constellation service provider (CCSP)
and air navigation service provider (ANSP) of the same State to support
safety case and approvals
– Requires failure modes and effects data, details of which are often not
made publicly available
 Basis for other ANSPs to approve the use of the services
– Requires commitment from CCSP to ICAO to meet certain standards
 Examples: for GPS Annex 10 refers to standard positioning service
performance standard and has major service failure standard
– Author suggests that more detailed information on failure modes and
probabilities may be needed for approvals in multi-constellation context
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Multi-constellation GNSS (2 of 2)
 Observations regarding the development of multi-constellation
systems
– Air navigation service providers are responsible for approvals
 This implies that ANSP assumes responsibility for safety
 Performs some data recording for potential incident investigations
 Is satisfied that approved core constellation meets the standards
– The latter point can be based on thrust into the processes of ANSP of
State of CCSP (e.g., approvals by FAA of navigation based on
GPS/RAIM) and/or active data recording and analysis
– Panel agreed to develop further guidance on related issues
 Objectives of data recording and monitoring, methodology, policy for
retention of data, reporting and notification in the case of observed
anomalies
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Advanced RAIM
 To what extent should ARAIM be standardized?
– Additional performance requirements (beyond those already in
Annex 10)?
– Link(s) to transmit the Integrity Service Message (ISM)?
– Elements of the algorithm?
 Update on progress in related research and development
– To be provided at the next meeting (May 2014)
 Input to standardization work
– To be provided at the following meeting (October 2014)
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Other Areas of Work (1 of 2)
 GBAS
– Conclusion that standardization of Terminal Area Procedures (TAP)
was premature at this time
– VHF Data Broadcast (VDB) link budget continues to present
difficulties; industry to consider raising height above runway
surface to 45 ft for minimum signal level
– Validation of GBAS Approach Service Type D (GAST-D) is
progressing and finalization of SARPs material is expected in 2nd
quarter of 2015
 Spectrum
– Panel agreed to develop guidance material on reporting of
international interference incidents based on earlier ICAO bulletin
and material from a EUROCONTROL workshop
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Other Areas of Work (2 of 2)
 Conventional Navigation Aids
– Several papers on rationalization (decommissioning) of VHF OmniDirectional Range (VOR) will be used as input to development of
ICAO guidance
– Potential way forward on updating the guidance material on
Instrument Landing System (ILS) Critical and Sensitive Areas by
raising minimum level for localizer signal protection from 200 to
400 feet
 Further work on glide slope protection still needed
 Interference from repeater stations
– Results of German study on position errors from airborne receiver
affected by repeater signals exceeding power limits
 Suggests further robustness and/or ability to detect and alert be built in
future receivers
 Issue to be brought to attention of RTCA and EUROCAE
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Acronyms
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ANSP
Air Navigation Service Provider
APNT
Alternative Position Navigation and Timing
APV
Approach with Vertical Guidance
ARAIM
Advanced Receiver Autonomous Integrity Monitoring
GBAS
Ground-Based Augmentation System
DFMC
Dual-Frequency, Multi-Constellation
GNSS
Global Navigation Satellite System
ILS
Instrument Landing System
IWG
Interoperability Working Group
LNAV/VNAV
Lateral Navigation/Vertical Navigation
MOPS Minimum Operational Performance Standard
NSP
Navigation Systems Panel
PBN
Performance-Based Navigation
SARPs
Standards and Recommended Practices
SBAS
Satellite-Based Augmentation System
VOR
VHF Omni-directional Range
© 2014 The MITRE Corporation. All rights reserved.