RTCA SC186 WG5 UAT MOPS GROUP

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RTCA SC186 WG5UAT MOPS GROUP
AMCP WGC3/WP9

• Status of activities

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Working Group 5

• Established in Dec 2000.
• Tasked to develop MOPS for ADS-B systems using
  the UAT data link.
• Chaired by George Ligler (PMEI), Richard
  Jennings (FAA)

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Participation

• US
• FAA, DoD,
• MITRE, JHU,
• US manufacturers and industry
• Europe
• Eurocontrol

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Objectives

• Completion date target of June 2002
• UAT MOPS will consider the ADS-B and FIS-B MASPS
  requirements, as well as other input as
  appropriate
• range requirements from Eurocontrol
• accuracy and integrity parameters from ADS-B
  MASPS update group (RTCA/SC186/WG6)
• TIS-B requirements are expected to be
  accommodated by the UAT MOPS.

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Objectives (cont.)

• Compatibility
• DME no more than 1 DME channel to be vacated
• JTIDS/MIDS (Link 16) coexistence under agreed
  operational scenarios.
• Performance Assessment of UAT air-to-air and
  air-to-ground performance in agreed traffic
  scenarios (LA Basin 2020 and Core Europe 2015)
• UAT frequency assignment initially within the
  U.S. However, the selected frequency should be
  possible to assign internationally

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Activities

• Bench tests to
• characterise UAT receiver response to
  transmissions from interfering UAT equipped
  aircraft
• characterise UAT receiver response to
  transmissions from DME and Link16
• characterise DME interrogator receiver response
  to UAT transmissions
• determine UAT receiver bandwidth in order to
  minimise impact of adjacent channel DME
  assignments

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Activities (cont.)

• Identification of candidate UAT channels on the
  basis of minimising impact to DMEs
• Simulations to
• Apply bench test data and agreed traffic
  scenarios to model UAT performance, and assess
  compatibility with DMEs and JTIDS/MIDS
• Determine optimum FEC coding and message
  structure for UAT
• Assure that selected UAT transmit power levels
  and receiver sensitivity can support ADS-B
  application requirements.

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Current Status

• Candidate operational frequency of 978 MHz
  identified
• Limits European impact to 6 assignments
• No US impact
• Waveform and message structure finalised
• Testing of representative DME interrogators
  proposed by the FAA and Eurocontrol indicates
  that UAT should not adversely affect DME
  operational performance

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Current Status (cont.)

• Simulations to date suggest that UAT can meet
  MASPS required performance in future high-density
  terminal areas in severe interference
  environments
• (analysis of cost/ performance tradeoffs
  continues)
• UAT MOPS sections, other than test procedures and
  installation requirements, are in draft form, as
  are several Appendices

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Meetings schedule
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Meetings (cont.)
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More information

• Web site
• http//adsb.tc.faa.gov/ADS-B/186-subf.htm