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1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE May 2002 3. REPORT TYPE AND DATES COVERED Technical Memorandum
4. TITLE AND SUBTITLE Development of Intent Information Changes to Revised Minimum Aviation System Performance Standards for Automatic Dependent Surveillance Broadcast (RTCA/DO-242A) 5. FUNDING NUMBERS 727-01-26-01
6. AUTHOR(S) Richard Barhydt and Anthony W. Warren
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) NASA Langley Research Center Hampton, VA 23681-2199 Boeing Air Traffic Management Seattle, WA 98124-2207 8. PERFORMING ORGANIZATION REPORT NUMBER L-18206
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) National Aeronautics and Space Administration Washington, DC 20546-0001 The Boeing Company Seattle, WA 98124-2207 10. SPONSORING/MONITORING AGENCY REPORT NUMBER NASA/TM-2002-211669
11. SUPPLEMENTARY NOTES Barhydt: NASA Langley Research Center, Hampton, VA; Warren: Boeing Air Traffic Management, Seattle, WA.
12a. DISTRIBUTION/AVAILABILITY STATEMENT Unclassified–Unlimited Subject Category 04 Distribution: Standard Availability: NASA CASI (301) 621-0390 12b. DISTRIBUTION CODE
13. ABSTRACT (Maximum 200 words) RTCA Special Committee 186 has recently adopted a series of changes to the original Minimum Aviation System Performance Standards (MASPS) for Automatic Dependent Surveillance Broadcast (ADS-B). The new document will be published as DO-242A. Major changes to the MASPS include a significant restructuring and expansion of the intent parameters for future ADS-B systems. ADS-B provides a means for aircraft to exchange information about their intended trajectories with each other and with ground systems. NASA and Boeing have played signifi-cant roles in recommending these changes and providing supporting analysis. The intent changes are anticipated to provide substantial benefits to several programs and operational concepts under development by the two organiza-tions. Major changes include the addition of Target State reports and the replacement of Trajectory Change Point reports with Trajectory Change reports. These changes have been designed to better reflect the capabilities of existing and future aircraft avionics, while providing benefits to current and proposed applications. DO-242A implements intent information elements that can be supported by current avionics systems and data buses. Provi-sions are made for future incorporation of other intent elements, as needed to meet operational requirements. This document summarizes the reasons for the DO-242A intent changes and provides a detailed overview of current and future intended ADS-B MASPS changes related to aircraft intent.
14. SUBJECT TERMS aircraft communications, aircraft tracking, collision avoidance, navigation systems (aircraft), digital communications systems (aircraft) 15. NUMBER OF PAGES 48
16. PRICE CODE
17. SECURITY CLASSIFICATION OF REPORT Unclassified 18. SECURITY CLASSIFICATION OF THIS PAGE Unclassified 19. SECURITY CLASSIFICATION OF ABSTRACT Unclassified 20. LIMITATION OF ABSTRACT UL
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