Furuno WR2120 Operator's Manual page 18

Hits mode:
Set a sample value for caluculating Zh, Zdr, φdp, and ρhv. Recommendation is using "Auto" mode.
・ Auto: It will determine and adjust the antenna rotation speed and PRF to proper values. Higher
hit value (lower rotation speed) brings higher accuracy.
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[e.g., 10 rpm = 60 deg/sec]
・ Manual: Adjust the value manually at "Hits value". Signal processing will be set by this hit value.
Hits value:
Enter the value for the hits mode when setup manual at "Hits mode".
Scan mode:
Select the scan mode of antenna. For PPI and
Volume scan modes, lower azimuth direction rotation
speed will observe higher accuracy.
On the other hand, fast rotation speed will cause low
accuracy.
A recommendation is to maintain observation accuracy on rotation speed less than 7.0 [rpm]. (Refer
to Table 2.8 )
PPI scan brief overview [2D data]
[Plan Position Indicator scan]
It scans a continuous equiangular with 360 degree horizontal rotation at a single selectable elevation
It is used to observe one set elevation continuously in a 360 degree radius.
Example of settings:
Observe 3.5 [deg] elevation angle at a rotational speed
of 7.0 [rpm] in a 360 degree azimuth radius set as
.
shown in Table 2.2
Sector RHI scan brief overview [3D data] (Refer to Figure 2.2 )
[Sector Range Height Indicator scan]
It scans vertically (RHI) while moving horizontally, continuously within a preset azimuth and elevation
range generating a 3 dimensional rectangular solid angle. Horizontal data is not saved.
It continuously moves between the preset clockwise and counter clockwise azimuth and horizontal
limits.
Example of settings:
The RainMap setting should be entered as shown
in Table 2.3 to observe the parameters shown
below:
・ Range of azimuth angle: 30.0 to 60.0 deg.
・ Azimuth step angle: 2.0 deg. (6.0 rpm interval)
・ Elevation angle: 3.5 to 22.0 deg.
Volume scan brief overview [3D data] (Refer to Figure 2.3)
This mode activates PPI scan to change the elevation angle up to 32 steps. It references the
Volume Scan Period and RainMap time indication.
Volume Scan is an observation of the azimuth rotation speed and multiple elevation angles as one
complete pattern.
Observation starts at the specified minute (0 second) of every set interval. Whatever set operation
interval is used, all selected steps must be completed within the specified interval time. These
volume scan periods are also necessary to consider the elevation angle value, observation rotation
speed (rpm), moving speed to elevation direction (rpm), time to stabilize after elevation change (fixed
at 10 deg.), and observation interval for setting.
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= 1.8
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PPI scan
Sector RHI scan
Volume Scan
Sector PPI scan
8
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Table 2.1
Scan mode Extension (V3 or V10)
sppi or sppix
Table 2.2
Key
EL angle [deg]
AZ rotation speed [rpm]
Table 2.3
Key
EL rotation speed [rpm]
AZ start angle [deg]
AZ end angle [deg]
AZ step angle [deg]
EL start angle [deg]
EL end angle [deg]
ppi or ppix
rhi or rhix
scn or scnx
Value
3.5
7.0
Value
6.0
30.0
60.0
2.0
3.5
22.0