© 2013 The MITRE Corporation. All rights reserved. SBAS IWG #25 Meeting St Petersburg, Russia 25-26 June 2013 Roland Lejeune RTCA SC-159 Working Group.

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Presentation transcript:

© 2013 The MITRE Corporation. All rights reserved. SBAS IWG #25 Meeting St Petersburg, Russia June 2013 Roland Lejeune RTCA SC-159 Working Group 2 Summary of Recent Meetings

| 2 || 2 | Introduction (1 of 2)  Only one RTCA SC-159 WG2 meeting since IWG/24: –March 12-13, 2013  Main agenda items addressed by WG2 (Topics 1 & 2): –System status updates  WAAS  EGNOS  GALILEO –GNSS Evolution  Concept of Operation for GPS/GALILEO receiver  Information needed for development of new MOPS  Planning for GNSS evolution © 2013 The MITRE Corporation. All rights reserved.

| 3 || 3 | Introduction (2 of 2)  Main agenda items addressed by WG2 (Topics 3 & 4): –Single-frequency SBAS requirements  DO-229D Change 1  SARPs/MOPS harmonization –Dual-frequency, multi-constellation (DFMC) development  DFMC Work Plan from IWG  DFMC receiver fallback modes  ARAIM development  RAIM availability of combined GPS/GLONASS receiver © 2013 The MITRE Corporation. All rights reserved.

Topic 2: GNSS Evolution

| 5 || 5 | Concept of Operation for GPS/GALILEO Receiver  Document being developed by EUROCAE –Initial draft completed in March 2013 –Document still in an early stage, but it will be updated as more information becomes available –Current focus is on GPS/Galileo user equipment using RAIM for integrity  DFMC SBAS will be included when DFMC SBAS is defined in sufficient detail  GLONASS mandate and the development of related MOPS will be discussed in a future update  Document will address benefits –Technical benefits such as improved accuracy –Operational benefits such as support for 4D operations and ADS- B, and improved robustness of low RNP operations © 2013 The MITRE Corporation. All rights reserved.

| 6 || 6 | Information Needed for Development of New MOPS  WG2 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 2012  An 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.

| 7 || 7 | Planning for GNSS Evolution  FAA briefing presenting the case for the development of DFMC MOPS –The 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 bands  Robustness to interference and (to extent practical) spoofing –Commercial 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 –Draft by 2015 © 2013 The MITRE Corporation. All rights reserved.

Topic 3: Single-frequency SBAS requirements

| 9 || 9 | Change 1 to DO-229D  Change 1 to DO-229D was published in February  It is available for download from the RTCA website © 2013 The MITRE Corporation. All rights reserved.

| 10 | 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 SBAS –Daniel 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, Acquisition –Other paper addressed 25 (mostly minor) inconsistencies  Antenna axial ratio, URA values, σ tropo formula, interference thresholds, tracking constraints,… © 2013 The MITRE Corporation. All rights reserved.

| 11 | SARPs/MOPS Harmonization (2 of 2)  Proposed changes to GEO requirements –Changes were approved by NSP at May 2012 meeting –They will be in Amendment 89 (applicable in November 2014)  Other proposed changes –Original version of paper was presented to NSP in May 2012 and updated version was presented in March 2013  Disposition 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 implementations –Original 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.

Topic 4: Dual-Frequency, Multi- Constellation (DFMC) GNSS

| 13 | DFMC Work Plan  Plan developed by the SBAS IWG with following objectives –Facilitate coordination among service providers –Develop material that will facilitate the development of SARPs and MOPS  Main products –Definition Document  Concept and high-level requirements –Various studies addressing the following questions  Operational concept  System requirements  User Interface  Notional schedule –Projected completion: end of 2014 © 2013 The MITRE Corporation. All rights reserved.

| 14 | DFMC Receiver Fallback Modes  Updated version of briefing presented at IWG/24 was provided to SC159 WG2 –Time constraints only allowed an abbreviated presentation of the material –Review by WG2 participants was requested  No comments were received to this date © 2013 The MITRE Corporation. All rights reserved.

| 15 | Advanced RAIM (ARAIM) Development  Research objective: provide a worldwide LPV-200 capability  Hybrid concept: multi-constellation RAIM-like algorithm in airborne equipment with input from integrity service message (ISM) provided by ground infrastructure –Ground 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 faults  Phase I and II completed in 2012 and 2013; Phase III report planned for early 2014 release –It will narrow down architectures to be fully evaluated © 2013 The MITRE Corporation. All rights reserved.

| 16 | RAIM availability of combined GPS/GLONASS receiver  Analysis from Stanford University –Research examined the potential availability benefit of horizontal guidance from RAIM algorithm that uses both GPS and GLONASS –Algorithm used is capable of accommodating differences in characteristics between GPS and GLONASS  Such as ranging accuracy and satellite fault rate –Conservative assumptions were made on GLONASS characteristics based on analysis of data of past performance –Availability 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.

| 17 | Acronyms  ADS-BAutomatic Dependent Surveillance - Broadcast  ARAIMAdvanced RAIM  DFMCDual-Frequency, Multi-Constellation  ISMIntegrity Service Message  LPVLocalizer Performance with Vertical Guidance  MOPSMinimum Operational Performance Standard  NSPNavigation System Panel  RAIMReceiver Autonomous Integrity Monitoring  RNPRequired Navigation Performance  SARPsStandards and Recommended Practices  SBASSatellite-Based Augmentation System © 2013 The MITRE Corporation. All rights reserved.