St Petersburg Russia 2526 June 2013 Roland Lejeune RTCA SC159 Working Group 2 Summary of Recent Meetings Introduction 1 of 2 Only one RTCA SC159 WG2 meeting since IWG24 March 1213 2013 ID: 346402
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Slide1
SBAS IWG #25 MeetingSt Petersburg, Russia25-26 June 2013Roland Lejeune
RTCA SC-159 Working Group 2
Summary of Recent MeetingsSlide2
Introduction(1 of 2)Only one RTCA SC-159 WG2 meeting since IWG/24:March 12-13, 2013Main agenda items addressed by
WG2 (Topics 1 & 2):
System status updates
WAASEGNOSGALILEOGNSS EvolutionConcept of Operation for GPS/GALILEO receiverInformation needed for development of new MOPSPlanning for GNSS evolution
© 2013 The MITRE Corporation. All rights reserved. Slide3
Introduction(2 of 2)Main agenda items addressed by WG2 (Topics 3 & 4):Single-frequency SBAS requirements
DO-229D
Change 1
SARPs/MOPS harmonizationDual-frequency, multi-constellation (DFMC) development DFMC Work Plan from IWGDFMC receiver fallback modesARAIM developmentRAIM availability of combined GPS/GLONASS receiver
© 2013 The MITRE Corporation. All rights reserved. Slide4
Topic 2: GNSS EvolutionSlide5
Concept of Operation for GPS/GALILEO ReceiverDocument being developed by EUROCAEInitial draft completed in March 2013Document still in an early stage, but it will be updated as more information becomes availableCurrent focus
is on
GPS/Galileo user equipment using RAIM for integrity
DFMC SBAS will be included when DFMC SBAS is defined in sufficient detailGLONASS mandate and the development of related MOPS will be discussed in a future updateDocument will address benefitsTechnical benefits such as improved accuracyOperational benefits such as support for 4D operations and ADS-B, and improved robustness of low RNP operations
© 2013 The MITRE Corporation. All rights reserved. Slide6
Information Needed for Development of New MOPSWG2 was asked to elaborate on information that is necessary before development of new MOPS can be undertaken
Could take the form of a
list of questions for which
answers are needed to support the development of new MOPS MOPS that include GLONASS, Galileo, or BeiDou, for ex.The request was made by the SC-159 Plenary during the discussion of the Russian mandate for GLONASS or GPS/GLONASS user equipment in October 2012An initial list of questions was prepared by EUROCAE and reviewed by RTCA SC-159 WG2
The list of questions will be further revised
over the
next few meetings
© 2013 The MITRE Corporation. All rights reserved. Slide7
Planning for GNSS EvolutionFAA briefing presenting the case for the development of DFMC MOPSThe technology is moving forward and equipment will be developed and brought to market by some manufacturer(s)
Multi-constellation receivers are already manufactured in some States
New issues have surfaced that must be addressed, and addressing them will require new MOPS
Complexities related to sovereign airspace (mandates, lack of approvals)Tolerance to transmission in adjacent frequency bandsRobustness to interference and (to extent practical) spoofingCommercial aviation requires a high service
availability
RTCA SC-159 WG2 agreed to start
working actively on
DFMC MOPS with the goal to
produce
a final
DFMC
MOPS by 2018
D
raft
by
2015
© 2013 The MITRE Corporation. All rights reserved. Slide8
Topic 3: Single-frequency SBAS requirementsSlide9
Change 1 to DO-229DChange 1 to DO-229D was published in February It is available for download from the RTCA website http://www.rtca.org/
© 2013 The MITRE Corporation. All rights reserved. Slide10
SARPs/MOPS Harmonization(1 of 2)In October 2010, WG2 decided to perform a detailed comparison between ICAO SARPs and RTCA MOPS (DO-229D) requirements for SBASDaniel Domey and Yi Ding from Esterline CMC Electronics developed a cross-correlation matrix, which was reviewed at following WG2 meetings
Two papers proposing SARPs changes were prepared to resolve inconsistencies
One paper addressed GEO requirements
Message Types 9/17, Crosscheck, AcquisitionOther paper addressed 25 (mostly minor) inconsistenciesAntenna axial ratio, URA values, σtropo formula, interference thresholds, tracking constraints,…
© 2013 The MITRE Corporation. All rights reserved. Slide11
SARPs/MOPS Harmonization(2 of 2)Proposed changes to GEO requirements Changes were approved by NSP at May 2012 meetingThey will be in Amendment
89 (applicable
in November
2014)Other proposed changesOriginal version of paper was presented to NSP in May 2012 and updated version was presented in March 2013Disposition of changes was postponed to allow more time for service providers to further review some of the changes and determine whether they would have any impact on existing SBAS implementationsOriginal version of paper was reviewed by SC-159 WG2 in
October
2012 and updated version was provided in March 2013
No comments were received on the updated paper
An updated version of paper will
be presented at the next NSP meeting
(November
2013)
Final disposition of proposed
changes
should be decided at
that meeting
© 2013 The MITRE Corporation. All rights reserved. Slide12
Topic 4: Dual-Frequency, Multi-Constellation (DFMC) GNSSSlide13
DFMC Work PlanPlan developed by the SBAS IWG with following objectivesFacilitate coordination among service providersDevelop material that will facilitate the development of SARPs and MOPSMain productsDefinition Document
Concept and high-level requirements
Various studies addressing the following questions
Operational conceptSystem requirementsUser InterfaceNotional scheduleProjected completion: end of 2014© 2013 The MITRE Corporation. All rights reserved. Slide14
DFMC Receiver Fallback ModesUpdated version of briefing presented at IWG/24 was provided to SC159 WG2Time constraints only allowed an abbreviated presentation of the materialReview by WG2 participants was requestedNo comments were received to this date
© 2013 The MITRE Corporation. All rights reserved. Slide15
Advanced RAIM (ARAIM) DevelopmentResearch objective: provide a worldwide LPV-200 capabilityHybrid concept: multi-constellation RAIM-like algorithm in airborne equipment with input from integrity service message (ISM) provided by ground infrastructureGround infrastructure performs a monitoring function, but ISM is not required to meet a tight time-to-alert like SBAS
Ground infrastructure envisioned to be much simpler than SBAS
However SBAS could also be used (with appropriate modifications)
ARAIM must be able to detect multiple faults as well as consistent faultsPhase I and II completed in 2012 and 2013; Phase III report planned for early 2014 releaseIt will narrow down architectures to be fully evaluated© 2013 The MITRE Corporation. All rights reserved. Slide16
RAIM availability of combined GPS/GLONASS receiverAnalysis from Stanford UniversityResearch examined the potential
availability benefit
of
horizontal guidance from RAIM algorithm that uses both GPS and GLONASSAlgorithm used is capable of accommodating differences in characteristics between GPS and GLONASSSuch as ranging accuracy and satellite fault rateConservative assumptions were made on GLONASS characteristics based on analysis of data of past performanceAvailability analysis revealed significant benefits from combining GPS and GLONASS (as compared to using only GPS)Benefits will be even greater when improved characterization of the more recent GLONASS constellation is available
© 2013 The MITRE Corporation. All rights reserved. Slide17
AcronymsADS-B Automatic Dependent Surveillance - BroadcastARAIM Advanced RAIMDFMC Dual-Frequency, Multi-ConstellationISM Integrity Service MessageLPV Localizer Performance with Vertical GuidanceMOPS Minimum Operational
P
erformance Standard
NSP Navigation System PanelRAIM Receiver Autonomous Integrity MonitoringRNP Required Navigation PerformanceSARPs Standards and Recommended PracticesSBAS Satellite-Based Augmentation System© 2013 The MITRE Corporation. All rights reserved.