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Figure 1.8: Ideal Condition
0m
0.62m
m
0m
Main lobe threshold: -20dB
1.6. Location of Radar Installation
1) Confirm the observed region in relation the topography features:
In this example the radar must cover an altitude of 1500 meters maximum and a 70km distance
radius within the rainfall forecast area. Therefore there should not be any structures or objects
higher than radar around the installation point.
2) When installing antenna on building rooftop or a tall tower in urban area:
When mount the radar on the stand or tower, it must be higher than any surrounding obstruction
(building, structure) for proper radar operation. The tower must be designed strong enough to
withstand heavy storms, winds and severe weather conditions.
Also remind that a crane or aerial work platform vehicle might be necessary to mount the radar and
install the tower. It is important to consider any additional space required for crane operation during
installation or repair.
3) Lightning protection and grounding considerations:
Provide a lightning rod near or around the radar area to improve lightning protection performance
based on JIS A 4201, JIS Z 9290 and IEC 62305.
The protection systems should include surge protectors/absorbers.
The grounding system will typically consist of an underground grid, radials, or rods which provide a
ground resistance of not more than 1 ohm. It should have a connection point at the base of the tower.
Refer to APPENDIX A for more detail.
12m
-3deg
0m
Return produces ground clutter
Figure 1.9: Distance of main lobe
2 . 7 deg
GOOD
Side view
6
Suppression
Ratio
Figure 1.8: Actual Condition
Main beam
Main lobe
NOT GOOD
GOOD
Range Side Lobe
50m
-2m
Observe area
NOT GOOD
Top view
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