|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
DUAL-POLARIZATION RADAR SYSTEM
1. Purpose and objectives
Rainfall measurement system by radar. The system is used for measurement of areal rainfall amount and rainfall prediction in short time.
The system consists of four major subsystems, which are the radar subsystem, the data processing subsystem, the controlling system and the data servicing subsystem.
Rainfall rate is estimated by the ZDR method and the Bß method. That is, when a rainfall rate is strong, the ZDR method is applied, and the Bß method is applied when a rainfall rate is weak. It is called combined method.
Rainfall rate is measured in mm/hr out to a range of 198 km (or 300 km) using a polar mesh of 256 sectors (1.4 degrees) by 1.5 km.
After the data
processing, the polar mesh is converted to the rectangular mesh
(1km x 1km) and the rainfall is displayed on CRT display in 9
rainfall amounts every 5 minutes on each mesh. Areal rainfall
amounts every 5 minutes are also displayed. The outputs can
be displayed on remote colour CRT displays in several formats.
5. Operational requirements and restrictions
personnel with experience of large electronic systems
are required. To extend the observing range the radar subsystem
should be sited on a mountain-top, with data being transmitted to
the data processing subsystem situated at the base of the
mountain. Only a simple building is
telemetering raingauges are required for calibration.
6. Form of presentation
and instrument specifications describing the radar equipment,
communication subsystem and data processing subsystem
8. Operational experience
Used successfully since 1998.
One system is
now in operation. This system consists of 26 radar raingauge
8. Originator and technical support
Originator: Ministry of Construction (River Bureau).
support: Toshiba Corp., Mitsubishi Electric Corp. and Japan Radio
From the HOMS
National Reference Centre for Japan.
10. Conditions on use
The system is for sale.
|(First entered: FEB 01||
Last updated: APR 00)