Federal Aviation Administration AP23 briefing on D4: Draft Proposal for a second set of GS/AS Applications ASAS-GN Seminar 13 Nov 08, Rome By Brian Baxley, NASA Ben Stanley, Helios

2 Federal Aviation Administration 2 Objective of this presentation  To outline a methodology for developing future, long-term ASAS applications based on ADS-B  To show how and why AP23 has developed the work  To highlight how to use the document and next steps to be taken

3 Federal Aviation Administration 3 AP23 Overview: Deliverables Five deliverables from AP23:  D1 – General data exchange  D2 – Methodology to prioritize applications for AP23  D3 – Operational Role of Airborne Surveillance in Separating Traffic  D4 – Draft proposal for a second set of ADS-B/ASAS applications  D5 – Draft White Paper on Issues Surrounding Airborne Separation

4 Federal Aviation Administration 4 AP23 D4: GS/AS Applications (V0.3, Oct 08) List of Chapters and Appendices  1. Introduction  2. Future Application Definition Process  3. Application Elements and Functions  4. Examples of Applications  5. Transition from “Package 1” to Future Applications  6. Way Forward  Appendix A: Application Template  Appendix B: Input from Stakeholders  Appendix C: Application Element Mapping  Appendix D: Element and Function Mapping  Appendix E: Submitted Applications and Element Mapping

5 Federal Aviation Administration 5 D4, Chapter 1 Introduction  AP23 is focused on long-term ground and airborne surveillance (GS and AS) applications of common interest between FAA and Eurocontrol, and beyond those already covered by RFG  It looks to NextGen and SESAR to set the scope and direction  AP23 developed and documented a process to prioritize applications and functions Possible applications Ideas (including SESAR + NextGen) Down- selection Feasibility

6 Federal Aviation Administration 6  D4 is not currently a list of proposed applications as per “Package 2”  D4:  Is a draft proposal for advanced ASAS elements and functions  Shows how AP23 organised the applications, and enhanced understanding of advanced applications  Includes “functional decomposition” of applications into building blocks  Is a work in progress, represents “snapshot” of current work D4, Chapter 1 Introduction: Objectives

7 Federal Aviation Administration 7  Why?  Elements and functions are used to streamline standardisation  rather than many applications in many environments, some standardised elements and functions may be used  leads to economical development and implementation  There is however an aim to highlight key applications  such that all required elements and functions have their requirements derived in the most demanding context  beneficial, or necessary in terms of meeting the performance goals of the future system  way of showing that elements/functions can be put together and that the approach works D4, Chapter 1 Introduction: Objectives

8 Federal Aviation Administration 8 D4, Chapter 2 Future Application Definition Process  4000 people solicited over 3 months (07/2007 – 09/2007) for ideas of future ASAS applications  Over 100 inputs received, with significant overlap in objective, operational use, requirements, and functions  Triggered new approach to find set of functions common to all ASAS applications regardless of environment  Resulted in grouping of:  ATSA:Situational Awareness  ASPA:Spacing  ASEP:Separation  SSEP:Self Separation  Surface:Surface  GS:Ground Surveillance This briefing

9 Federal Aviation Administration 9 Use AP23 D4 Application elements ASAS Functions Environment description Candidate application description Operational Requirements Applicability Area/Conditions Safety Requirements Performance Requirements Interoperability Requirements D4, Chapter 3 Application Elements and Functions  Process to build an application:  Elements + Functions + Environment = Application  Application elements - A basic ASAS-enabled (operational) capability of the subject aircraft that cannot easily be subdivided further into more basic elements.  ASAS functions - the processes, calculations, and monitoring tasks that must be supplied by the ASAS avionics system to enable the application element.  Environments - en-route, procedural, terminal, and surface.

10 Federal Aviation Administration 10 D4, Chapter 3 Application Elements (1 of 5)  Objective: - Enabling Applications  Identify Designated Aircraft  Transfer Separation Responsibility  Contingency Procedures Contingency Procedures Transfer Separation Responsibility Identify Designated Aircraft

11 Federal Aviation Administration 11 D4, Chapter 3 Application Elements (2 of 5)  Objective: Achieve Relative Position  Target Point Merge  Target Track Merge  Dynamic Path Merge  Pair-Wise Interval Achievement Target Track Merge Target Point Merge Dynamic Path Merge Pair-Wise Interval Achievement

12 Federal Aviation Administration 12 D4, Chapter 3 Application Elements (3 of 5)  Objective: - Maintain Relative Position  Pair-Wise Interval Maintenance  Track Follow  Dynamic Path Follow Target Follow Pair-Wise Interval Maintenance Dynamic Path Follow

13 Federal Aviation Administration 13 D4, Chapter 3 Application Elements (4 of 5)  Objective: - Maximize Use of Desired Trajectory  Vertical Passing & Crossing  Lateral Passing & Crossing  Delegated Encounter  User Request Manoeuvre  Conflict Management  Manoeuvre w/o Conflict Conflict Management Delegated Encounter Manoeuvre w/o Conflict Lateral Passing & Crossing Vertical Passing & Crossing User Request

14 Federal Aviation Administration 14  Example surface application elements (draft)  Runway crossing  Runway incursion detection (and resolution)  Taxi follow  Taxi merge  Autonomous take-off (in TM environment) D4, Chapter 3 Application Elements (5 of 5) Runway Crossing Taxi Merge Taxi Follow

15 Federal Aviation Administration 15 D4, Chapter 3 ASAS Functions  ASAS functions - the processes, calculations, and monitoring tasks to enable the application element. There are:  Traffic Data: identify & track aircraft, provide reference aircraft trajectory, assess initiation/continuation/termination criteria  Merge: compute manoeuvre to the merge, compute merge location  Follow: compute dependant following trajectory  Manage Interval: compute speed to achieve and maintain interval, monitor interval conformance  Separation Maintenance: monitor and maintain separation between reference and subject aircraft  Conflict Detection: probe trajectory for conflicts, alert crew to conflicts  Conflict Resolution: vertical, lateral, or user-preferred trajectory to ensure traffic separation  Trajectory Optimization: compute conflict-free user-preferred trajectory, compute manoeuvring flexibility

16 Federal Aviation Administration 16 D4, Chapter 4 Example of Application Two examples to put together process, elements, and functions.  #1): Merging and Spacing with Separation  ASEP M&S (PO-ASAS 3)  Objectives:  Achieve Relative Position  Maintain Relative Position  #2): Self-Separation Airborne Trajectory Management  SSEP-AirTM (PO-ASAS 4)  Objective:  Maximize Use of Desired Trajectory

17 Federal Aviation Administration 17 D4, Chapter 4 Example #1 of Application: ASEP M&S (1 of 2)  NAME: ASEP M&S  Ground Set-Up  Aircraft Operation Crew receives clearance, selects lead aircraft, enters assigned spacing interval. Crew verifies acceptable speed, then follows speed guidance Crew follows speed guidance while merging the aircraft

18 Federal Aviation Administration 18 D4, Chapter 4 Example #1 of Application: ASEP M&S (2 of 2)  Objectives:  Achieve Relative Position  Maintain Relative Position P2: Aircraft ID and Procedure Feasibility P3: Clearance & Transfer of Responsibility P4: ASEP M&S Procedure P5: Procedure Complete P6: Exceptions P1: Set Up  Elements:  Functions: P2 P3 Identify Designated Aircraft Transfer Separation Authority P4 Target Point Merge Pair wise Interval Achievement Pair wise Interval Maintenance Track Follow Transfer Separation Authority P5 Contingency Procedures P6 Identify reference aircraft Track reference aircraft Provide reference aircraft trajectory Assessing initiation criteria P2 P3 Compute maneuvers to merge Compute speeds to achieve and maintain interval Compute dependent following trajectory Monitor maintenance of separation Compute guidance to maintain separation Assessing continuation criteria P4 Assessing termination criteria P5

19 Federal Aviation Administration 19  NAME: SSEP AirTM  Ground Operations  Manage Airspace Resources  Generate Flow Constraints  Manage Unequipped Aircraft  Airborne Operations  Broadcast State and Intent Data  Self-Separate from Traffic, Weather, and Airspace  Conform to Ground- Generated Constraints (RTAs, etc)  Optimize Trajectory                         En Route Airspace Ground managed Self-Separating Next briefing, “NASA ASAS” covers more detail D4, Chapter 4 Example #2 of Application: SSEP AirTM (1 of 2)

20 Federal Aviation Administration 20 D4, Chapter 4 Example #2 of Application: SSEP AirTM (2 of 2)  NAME: SSEP-AirTM  Objectives:  Maximize Use of Desired Trajectory P1: Set Up Trajectory P2: Responsibility Transfer P3: Separation Prediction P5: RBT Change Monitor P7: Termination P8: Exceptions P6: Trajectory Revision P4: Performance Monitor AC approaches transfer point AC continues along trajectory Trajectory change required Current trajectory is acceptable  Elements:  Functions: P1 P2 User requested maneuver Transfer Separation Authority P3 P6 Conflict detection And resolution Maneuver without conflict Transfer Separation Authority P7 Contingency Procedures P8 Probe trajectory for conflicts Track reference aircraft Provide reference aircraft trajectory Assessing initiation criteria P1 P2 Assessing termination criteria P5 P3 P6 Probe trajectory for conflicts Monitor maintenance of separation Compute guidance to maintain separation Assessing continuation criteria Compute user- preferred trajectory to provide separation Alert crew for conflicts Compute traffic-constrained user-preferred trajectory Compute aircraft performances Compute maneuvering flexibility

21 Federal Aviation Administration 21 D4: Way Forward  AP23 is proposing  a set of ASAS elements and functions,  a method to build applications, and  how to apply this in a practical manner for NextGen and SESAR.  D4 stops short of proposing a firm set of applications for “Package 2”  Engage with larger community to build key applications  Cost benefit analyses to be performed by stakeholder in specified scope and operational environment  Lots of validation now needed – to be identified in the next AP23 deliverable (D5 – issues for ASEP)  D4 is a work in progress, represents “snapshot” of current work

22 Federal Aviation Administration 22 Thank you

Application Elements ASAS Functions Spec ify a refer ence aircr aft Track refere nce aircra ft Provi de refere nce aircra ft's traject ory Compu te maneu vers to merge Comp ute merg e locati on Comp ute depe ndent follow ing traject ory Comp ute speed s to achie ve interv al Monitor interval confor mance Monitor mainte nance of separat ion Comp ute guida nce to maint ain separ ation Probe traject ory for confli cts Conf lict alerti ng Comp ute vertica l mane uvers to provid e separ ation Comp ute lateral mane uvers to provid e separ ation Comp ute user- preferr ed traject ory to provid e separ ation Comput e traffic- constrai ned user preferre d trajector y Comp ute mane uverin g flexibil ity Target Point Merging xxxx Target Track Merging xxxxx Dynamic Path Merging xxxxxx Pair-wise Interval Achievement xxxxx Pair-wise Interval Maintenance xxxxx Track Following xxx Dynamic Path Following xxxx

Application Elements ASAS Functions Spe cify a refer ence aircr aft Track refere nce aircra ft Provi de refere nce aircra ft's traject ory Compu te maneu vers to merge Comp ute merg e locati on Comp ute depe ndent follow ing traject ory Comp ute speed s to achie ve interv al Monitor interval confor mance Monitor mainte nance of separat ion Comp ute guida nce to maint ain separ ation Probe traject ory for confli cts Conf lict alerti ng Comp ute vertica l mane uvers to provid e separ ation Comp ute lateral mane uvers to provid e separ ation Comp ute user- preferr ed traject ory to provid e separ ation Comput e traffic- constrai ned user preferre d trajector y Comp ute mane uverin g flexibil ity Vertical Passing or Crossing xxxx Lateral Passing or Crossing xxxx Delegated Encounter Management xxxxxxx User Requested Manoeuvre xxxxxxxxx Conflict Detection xxxx Conflict Resolution xxxxxxxx Manoeuvring Without Conflict xxxxxxx Identifying Designated Aircraft x Transferring Separation Responsibility