Appendix D. IRIS TDWR
Features
D.1 Items Provided with IRIS/TDWR
Option
The optional IRIS/SHEAR package includes features for terminal Doppler weather radar
applications:
• SHEAR Product
The WARN product run on a radial SHEAR product is used for microburst detection.
See SHEAR : Wind Shear (page 176).
• SLINE Product
Detects wind shifts associated with gust fronts and cold fronts. Can use radial,
azimuthal or combined radial and azimuthal shear.
See SLINE : Shear Line (page 188).
• Ribbon Display
Ribbon display terminals (RBDT's) are large format text-only displays that are used to
display and signal alerts to controllers. IRIS supports US FAA-style Dale RBDT's which
are serial line hardware devices and Virtual RBDT's (vribbons) which are X-Window
displays.
See Ribbon Displays (page 342).
• TDWR/LLWAS Integrator
Uses the US FAA algorithm to integrate information from IRIS shear warning products
and LLWAS (low-level wind shear alert system) to generate TDWR products for output
to standard US FAA-style ribbon displays. Note that an LLWAS system is not required.
See TDWR/LLWAS Integrator and Runways Utility (page 353).
• Runway Utility
Graphical utility for selecting the active runways that are in use. The information is used
by the TDWR/LLWAS Integrator to select for which runway corridors alerts are issued
to the RBDT's.
See Runways Utility (page 360).
These features, combined with all the standard features of IRIS, provide controllers with
timely, concise information concerning wind shear and other weather phenomena that can
aect air terminal operations.
The TDWR used by the US FAA is based on technology circa 1985. Since this time, computer
speeds have increased dramatically. There have also been changes, in algorithms,
networking standards and user interface. The goal of the IRIS/TDWR is to take the best
elements of the TDWR designs and implement them in the context of today's technology.
Vaisala does not warrant that the IRIS/TDWR option will function in accordance with US FAA
Specifications.
IRIS Product and Display User Guide M211319EN-H
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