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commitment to the aviation weather industry. Our experience in both
developing products for aviation weather systems, and managing installations
of these systems ensures that we can provide the most qualified installation
support and services to all of our customers.
1.2 LLWAS System Summary
The Almos LLWAS-III system is a component of Almos’ advanced MetConsole
Aviation/Meteorology display and processing system. The modularity of
Almos’ design ensures that the provided LLWAS will meet and exceed lifetime
requirements while providing a maximum of future expandability options if
required.
The main MetConsole system is a completely configurable software package
designed to operate under Windows environments (95, 98, NT, 2000,
2003,…). A wide variety of communications, display and processing modules
may be included with a MetConsole system to provide the required
functionality.
In addition, dual server operation of the MetConsole package ensures that
system configuration and servicing may take place without interruption of the
LLWAS detection algorithm.
Additional modules may be ordered initially or added later, including ATIS
(computer generated voice, data output, or operator-recorded message),
METAR/SPECI, AFTN integration and a variety of standard WMO messages,
data input/output and observer screens. MetConsole is designed to allow you
TELVENT Low Level Windshear Alert System
Almos
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LLWAS
Low Level Windshear Alert System
to completely integrate your Aviation computer systems, either now or in the
future.
The MetConsole LLWAS component uses a communications and processing
design that has been installed and tested in a number of different
environments, including Darwin International Airport (Australia), Sungshan
and Chiang Kai Shek Airports (Taiwan), Bilbao and Tenerife Airports (Spain)
and Kuwait International Airport (Kuwait).
Key points in the selection of an Almos MetConsole solution include:
• Cost effective
• User friendly
• Extensive, well written user help & manuals
• High speed Processing
• Extremely Reliable Communications
• Robust Equipment
• Commitment to Quality and Reliability
• Committed to Customer Satisfaction
• COTS processor - No customisation required.
• Experience in design and manufacture of LLWAS equipment
• Worldwide coverage
• UCAR Licensee since 1996
• Easy maintenance makes better use of manpower.
• Expandable software configurable to each customer’s unique
requirements.
• Easy connection to DWR LLWAS Radar.
2. System Description
2.1 System Performance
2.1.1 System Performance Overview
Almos’ LLWAS is implemented using Almos’ MetConsole software system to
provide both a proven, reliable design as well as a system that is easy to use
TELVENT Low Level Windshear Alert System
Almos
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LLWAS
Low Level Windshear Alert System
and maintain. (MetConsole is the same system software used for AWOS, ATIS,
ASOS and other system products.)
This document describes the proposed implementation of this system to
ensure that the LLWAS detection system meets or exceeds all internationally
recognised requirements.
Almos’ LLWAS system uses the UCAR Phase-III LLWAS algorithm. Coupled
with a fault tolerant communications system that well exceeds the standard
1.05e7 bit error rates, Almos’ probability of detection meets that promised by
the UCAR Phase-III LLWAS algorithm for any given airport configuration.
The Almos LLWAS system provides the detection performance for a standard
airport configuration as included in the following table:
POD 94% The probability that some alert (WSA or MBA) is issued
whenever microburst intensity exceeds 15 knots
POD:MB 97% The probability that some alert (WSA or MBA) is issued
whenever microburst intensity exceeds 30 knots.
PID:MB 92% The probability that an MBA is issued whenever
microburst intensity exceeds 30 knots
PFA:MB 3% The probability that an issued MBA is false; it is not
related to any part of a microburst life cycle.
POW 7% The probability that an issued WSA is an over warning;
the event is a microburst with strength less than 30
knots.
PUW 8% The probability that an issued WSA is an underwarning;
the event is a microburst with strength
greater than 30 knots.
Determining an exact POD at each airport is possible only through operational
use with the installed configuration, as localised meteorological, topographic
and geographic features will affect the resulting performance.
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