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direction.
In practise, wind speed ratios can differ from 1.00 for various reasons. For
example, if all the ratios are low his may indicate a wind speed sensor bearing
problem causing it to rotate slowly.
Both the “Speed Ratio over Direction Graph” and the “Difference from
Mean” wind gauge indicate to a user if there is an obvious problem with a
station sensor and whither the problem is directional or not.
Speed Ratio Frequency Graph
This graph shows the ratio of the weather station wind speed sensor data
average against the network wind speed average, for all directions.
A “perfect” system would register a ratio of 1.00 in all directions.
Direction Difference Frequency Graph
This graph shows the percentage difference between the weather station’s
sensor direction average against the network direction average. A difference
of ±5º is considered acceptable.
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2.1.11.4 Installation and Maintenance Tools
2.1.11.4.1 Communications Testing Tools
Due to the fact that the entire communication system is based on digital
radios and a digital protocol, all communication analysis is done in software.
Other devices are not needed to isolate faults and monitor the
communications however the IFR 1600 is quoted as an option.
2.1.11.4.1.1 Communication Service Monitor
The equivalent of the Communication Service Monitor is a software package
that is delivered with the digital radios. Please see the Maintenance section in
the WAWS Installation and Maintenance Manual.
2.1.11.4.1.2 Serial Communication Analyser
The Technicians Screens in the MetConsole software running on the Master
Station Servers may be used to analyse the digital communication traffic.
These screens are described in the Maintenance Section of the MetConsole
Reference Manual.
2.1.11.4.2 Installation Tools
The following is a list of the tools which will be provided for the installation
and servicing of the LLWAS equipment :
1) Adjustable Spanners-
• 6"
• 10"
2) Crimp Tools-
• Suitable for Bootlace Ferrules
• Suitable for crimp lugs used
• Suitable network RJ45 plugs (8 way 8 contact)
• Suitable for RF connectors used
3) Drill Bit Set -
4) Drill – Battery type
5) Hexagon Key Set - Imperial Sizes
6) Pliers -
• Long Nose
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• Linesman’s
• Sidecutters
7) Knife with snap-off blades
8) Scissors
9) Screwdrivers -
• 3.5mm Flat Blade
• 5mm Flat Blade
• No.0 Posidriv
• No.1 Posidriv
• No.2 Posidriv
10) Weller Soldering Iron & Solder
11) Wire Strippers
12) 60mm Mini Bench Vice
2.1.12 System Modes (States)
The LLWAS software runs in a number of states based on the availability of
remote stations in the network, and the presence of maintenance activities
being carried out on the system. These states are described in detail below.
2.1.12.1 Real Time Normal
All remote stations and text displays (AADs) are fully operational.
2.1.12.2 Real Time Degraded
At least one remote station is not operational and at least a specified number
of remote stations are operational. This specified number is a parameter
defined in the CAA furnished configuration files. The system is also in the
Real Time Degraded state when fewer than all of the text displays (AADs) are
operational.
2.1.12.3 System Support
Fewer than a specified number of remote stations have been operational for a
period of time. The specified number of remote stations is a parameter
defined in the CAA furnished configuration files. The period of time is
defined by the algorithm's ability to fill data gaps. (Refer to the algorithm
specification in Appendix A)
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The system is also in the System Support state whenever the system
determines that at least one of the configuration files is invalid or whenever
other serious unexpected system problems are encountered.
2.1.12.4 Initialization
The system state during the period of time required for the system to start up
from the powered off condition until it is processing adequate data to start
displaying wind data, wind shear and microburst alerts (as defined in the
algorithm specification).
The system shall complete its initialization procedures and restore itself to real
　
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