H

Elevation Angle 3 °

Elevation Angle 3 °

Horizontal Plane Horizontal Plane

Ground Ground

A

A < H + D tan 3 °

A = Height of the building

H = Height of the antenna pedestal bottom above the ground

D = Horizontal distance between the bottom center of an antenna pedestal and the building

Sketch 1

Limit Line of Building Height Limit Line of Building Height

D

The radius of clearance zone surrounding a weather radar antenna is described as follows ：For the zone 0 - 186 m, the height limit of surrounding buildings is 30meters. Zone of the minimal discernible signal ： (Pulse width) ×(Wave speed)÷2 ＋ (Distance between the pl

ane of antenna disk and central axis of pedestal) As for the CWB’s Doppler weather radar : (3.3 × 10-6) × (3 × 108) ÷2 ＋ 3 ＝ 498 m

186 m 186 m ~498 m

Heightof AntennaTower (30m)

0.5°

Building Height Limit

Sketch 2

Elevation Angle 3 °

Elevation Angle 3 °

Limit Line of Building Height Limit Line of Building Height

Horizontal PlaneHorizontal Plane

Ground Ground

AH

A < H + D tan 3 °

A = Height of a building

H = Height of the bottom center of the antenna pedestal above the ground

D = Horizontal distance between the bottom center of the antenna pedestal and the surrounding building

Sketch 3