presented to: iwg 26 by: jason burns (faa) date: february 5-7, 2014 federal aviation administration...

Presented to: IWG 26

By: Jason Burns (FAA)

Date: February 5-7, 2014

Federal AviationAdministration

DFMC

Work Plan Update

2Federal AviationAdministration

DFMC Work PlanFebruary 5-7, 2014

Outline

• Background / Purpose• Task Progress Review• Discussion areas



Background and Purpose

• IWG has identified the need for a DFMC Definition Document outlining a requirements concept for Dual Frequency Multi-Constellation (DFMC) SBAS

• A draft work plan to develop this document was presented at Ottawa 2012 (IWG-23)– Presented again at IWG-24

• This work plan status update– Identifies efforts in progress

• Should assess progress based on presentations

– Identifies areas with little to no effort

3



Tasks

• Operational Concept– Operational Goals and Services– GEO Selection and Transition– Reversionary Modes– Identify Benefits

• System Requirements– Interchangeable Satellites– Safety Strategy– Avionics Design Constraints

• Interface Definition– Interface Requirements– Interface Control Document

• Definition Document



Operational Goals and Services

• Objectives– Identify minimum target operations and supporting services– Propose service classification schemes for coordination with standards

bodies

• Status– Initial proposed operational targets discussed at IWG 23. Documented in

Work Plan Section 2– Fairly well documented in Definition Document outline

• Contains no new services or operations beyond current DO-229

– Need to update if there are specific changes for ADS-B or TBO



GEO Selection and Transition

• Objectives– Enable SBAS interoperability when transition between different operations, GEO

coverage volumes, SBAS service volumes, international airspace and state airspace.

• Status– Briefing and white paper available on options provided at IWG-26 (Feb 2014)

– Requires IWG discussion/guidance on narrowing options• Request comments by April 30, 2014

– Can develop specific recommended requirements based on SBAS selection method• White paper 2-4 months after decision on selection method



Reversionary Modes• Objectives

– Identify minimum required avionics modes and supporting navigational services to support preferred fallback strategy and minimum operations.

• Status– Briefing prepared by MITRE for IWG 24– ESA brief (IWG 26) and white paper (April/May 2014)

• Deliverables

Description Deliverable POC Due DateBenefits Analysis of L5 only service and whether to define it as an optional mode

Report Eurocontrol Still need to resolve

White Paper identifying preferred set of modes for avionics and corresponding SBAS Services

White Paper MITRE Complete IWG 24

Standard User Algorithms specification/definition, verification and justification, for each individual algorithm.

Extract of PROSBAS D2.3.1 Document

EC/ESA • Internal ESA/EC review• April/May 2014 : Input for

IWG DFMC Document



Identify Benefits

• Objectives– Identify benefits for ANSP and avionics manufacturers

• Status– No definite plan to address

– Any interest, commitment from new States• Support for SBAS reference stations• Approval of SBAS service based on dual-frequency

Description Deliverable POC Due Date

Draft Benefits section of Definition Document

Draft Sections TBD TBD

Documents results of feasibility analysis. Identifies key risk areas and future work.

White Paper TBD TBD



Interchangeable Requirements

• Objectives– Identify technical issues necessary to support this capability – Derive requirements necessary to mitigate technical issues– Identify and quantify any resulting technical risks associated with this

capability and the derived requirements.• Status

– ESA Position Computation Equations• Definition of Inter System Issues (Geodetic References, Time References, Inter

System Bias)• April/May input for DFMC Definition Document



• Objectives

– Explain high level safety strategy and clearly identify subsystem safety objectives (e.g. integrity and continuity performance targets)

• Status

– No drastic change from current SBAS standards on approach to safety (e.g. not reallocation of integrity between ground and airborne subsystems)

– ESA Protection Level Calculations

• Brief at IWG-26, April/May input for DFMC Definition Document

– Threat list or modification of Safety Strategy effort not underway

• Propose using threat listed in ARAIM paper (see additional briefing)

Safety Strategy

Description Deliverable POC Due DateSafety Strategy of Definition Document Draft Sections IWG TBDThreat List White Paper IWG TBDUser Performance Allocations - Airborne and ground subsystem integrity and continuity allocations



IWG DFMC Document

Specification, Verification and Justification of the SBAS L1/L5 Standard User performances, both for each individual performance, and for the global Performance



IWG DFMC Document

Draft Definition Document sections for airborne and ground subsystem performance requirements

Draft Sections FAA TBD



Avionics Design Constraints

• Objectives– Identify key minimum design constraints which avionics must comply

with to enable DFMC concept

• Status– Briefed Signal Quality Monitoring and recommended correlation

requirements (IWG-25, RTCA Oct 2013)

– ESA working aviation error budgets

Description Deliverable POC Due Date

Airborne and Ground subsystem tracking requirements, RF requirements, etc.

Draft Sections FAA RTCA brief Oct 2013



Interface Requirement

• Objectives– Develop interface requirements

• Status– Reached consensus on ICD changes

– Need to document signal format changes and accompanying requirements

• E.g. propose redlines to DO-229D, Appendix A which describes current signal specification

Description Deliverable POC Due DateSIS RF Definition Extract of

PROSBAS D2.1.1 Document

Existing eurocae complemented by EC / ESA

4 versions :

May 2013, Nov 2013, May 2014, Nov 2014

Interface Requirements Draft Sections TBD TBD



Interface Control Document

• Objectives– Develop the message

structure for DFMC GEO L1 and L5 SIS

• Status– Reached consensus on ICD

changes – Dec 2013

• Briefed at IWG 26

• Working on updated ICD

– Recall previous SiS, transport layer effort

Description Deliverable POC Due DateSiS Messages Definition Extract of

PROSBAS D2.2.1 Document

EC / ESA Beginning 2014

Assessment of Message performances Extract of PROSBAS D2.2.2 Document

EC / ESA • PROSBAS ION GNSS+ 2013 paper

Trade analysis of formatting options Presentations EC/ESA • PROSBAS ION GNSS+ 2013 paper

• Stanford ION GNSS+ 2013 paper

Documentation of preferred format, including preliminary IRD and ICD information.

Extracts of PROSBAS Documents

EC/ESA IWG (mid 2013)

Draft Interface Control Document (ICD) Draft ICD EC/ESA Beginning 2014

Detailed Interface Control Document (ICD) Interface Control Document

TBD Update release end 2014, modify through standards process



Definition Document

• Objectives– Identify required Definition Document content and assign resources– Maintain Definition Document and populate with information when

available• Status

– Initial outline drafted. Briefing prepared by FAA for IWG 24.– Updated expected following white paper receipt April/May 2014

• DeliverablesDescription Deliverab

lePOC Due Date

Draft initial Definition Document outline identifying sections needed to address key DFMC concept issues.

DFMC Definition Document Outline

FAA Dec 2012

Incorporate all sections into the Definition Document. Finalize draft for IWG review and approval.

DFMC Definition Document

FAA Dec 2014



Discussion Areas

• Benefits for Dual-Frequency SBAS• Benefit of optional L5 ionosphere grid broadcast• Safety strategy

– Threat list / threat identification– Effort required if desire to support operations more demanding

than LPV-200• Interface Requirements Document



Summary

• Review progress of work plan

• Provided updates based on presentation at IWG 26

• Identified work plan topics at risk

• Discussed path forward

• Please provide comments to – [email protected]– [email protected]

Presented to: IWG 26

By: Jason Burns (FAA)

Date: February 5-7, 2014

Federal AviationAdministration

Backup