AIS Data Link

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AIS Data Link

• RTCA SC-206
• Washington, DC
• July 18 - 20, 2005

Jim Terpstra
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SC-206 AIS or Data Link?

• We are to decide the format of the content
  between the master storage unit (tea pot) to the
  end user unit (the glass).
• We are NOT to design the teapot, the glass, or
  the conduit between them.

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SC-206 AIS or Data Link?

• Does the flow go both ways?
• Most likely with weather data
• Most likely not with aeronautical information data

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Terms of Reference
PRODUCTS DUE DATE

• 1) Revise - DO-267A, Minimum Aviation System
  Performance Dec 2005
• Standards (MASPS) for Flight Information
  Services Broadcast (FIS/B)
• Data Link.
• 2) Revise - DO-252, Minimum Interoperability
  Standards (MIS) for Dec 2005
• Automated Meteorological Transmission (AUTOMET).
• 3) Develop new document - Minimum Aviation
  System Performance Dec 2006
• Standards (MASPS) for Flight Information Services
  - Tactical Use
• (as opposed to advisory, non-control use) AIS
  applications

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Based on Data-Driven Charts
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Three Category of Chart Types

• Raster
• Individual pixels
• Pre-composed
• Vector
• Lines, arcs, text, etc. drawn from pre-determined
  locations
• Pre-composed
• Data Driven
• Image created on the fly from database

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Raster Charts
Can be geo-referenced
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Vector Charts
Can be geo-referenced
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Data-Driven Charts
Are always geo-referenced
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Three Primary Areas of Interest

• Weather
• NOTAMs
• Aeronautical Information

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TFR NOTAMsTemporary Flight Restrictions
TFR Graphic Overlay - Dimensions - Duration -
Contact Info
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NOTAM

• KBZN FIRST 3000 FT RWY 30 CLOSED FOR REPAIRS

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NOTAM

• KBZN BZN VOR OTS UFN

Procedure still valid?
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NOTAMBZN VOR OTS UFN
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NOTAMBZN VOR 2NM NE
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ICAO Aeronautical InformationRegulation and
Control (AIRAC)

• 28-day cycle for computer NavData
• 21-day cut off for database information
• ICAO specifies 42 days in advance
• Mass source changes come too late
• New cycle every fourth Thursday

21-day NavData cutoff
42-day AIP Advance
Effective Period
28-day cycle
28-day cycle
28-day cycle
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ICAO Aeronautical InformationRegulation and
Control (AIRAC)

• 7, 14, 28-day cycle for chart revisions
• 17 and 24-day cut off for chart information
• ICAO specifies 42 days in advance
• Mass source changes come too late
• New cycle every fourth Thursday

17-day Chart cutoff
42-day AIP Advance
Effective Period
28-day cycle
28-day cycle
28-day cycle
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FMS

• Currently on 28-day cycle
• Effective date cycle matches charts
• Information does not match charts
• Should FMS be updated incrementally?
• Should 28-day cycle be killed?

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Symbology
Symbology not in scope for SC-206 Issue is being
worked by SAE G-10 ABET
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Some personal thoughts

• WX half of our efforts
• Short term AIS
• TFRs
• Some graphic overlays
• on raster vector charts
• Long term AIS
• Full impact of AIS Data Link needs data-driven
  charts
• Determine applicability to FMSs
• Our goal is to determine timing and specs
• Security such as CRCs considered

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AIS Data Link

• Thanks
• July 18 - 20, 2005

Jim Terpstra