Furuno WR110, Installation Manual

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1.3. Mechanical Operation
This system observes the development of rain clouds outputs the intensity of precipitation, the speed
of rain clouds (Doppler speed) and observes rainfall phenomena. It is capable of high resolution rain
observation, rain cloud, precipitation density and speed observation. The solid-state transmitter
replaces previous aging devices such as a magnetron.
The area sampled by the radar increases with distance. The wider the beam the greater the likelihood
of sampling a mixture of precipitation types and also a greater the likelihood of sampled both inside
and outside a cloud. Obstacles can also block a portion of the radar beam resulting in an artificially
high power return.
Required accuracy for leveling:
Although 0.2 degrees is an acceptable level, it may
cause a 104.9m difference at a 30km distance from
radar. For best target accuracy make mount level 0.0 to
0.1 degrees.
1.4. Multi-radar System
The single X-band weather radar can be difficult to avoid problems with blind areas due to buildings,
mountains or strong signal extinction by heavy rain.
Furuno provide multi-radar system that consists of three radar systems. While two radar systems are
detecting and tracking rain clouds and observing their movements, the other one is working as RHI
sector scan mode at high speed and cutting through the clouds to observe their internal structures. It is
very difficult to complete signal processing of all the radar systems on single PC because of the CPU
performance. Therefore signal processing is distributed among the PC of each radar system, and all the
data are gathered on the central PC and composited into one synchronized image.
Elevation Angle
Azimuth Angle
The diagram shows the comparison between ground surface and height of
radar beams
Upper radar beam
Ground surface
Ground projection point
Ground projection point
Middle radar beam
Lower radar beam
Radar unit
mounting point
Observation area
Observation point
Ground clutter
Ice crystal snowflake
raindrop
graupel
Rain gauge
hail
Evaporation
wind
sun