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H Elevation Angle 3 ° Horizontal Plane 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 D
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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 plane of antenna disk and central axis of pedestal) As for the CWB’s Doppler weather radar : (3.3 × 10 -6 ) × (3 × 10 8 ) ÷2 ＋ 3 ＝ 498 m 186 m186 m ~498 m Height of Antenna Tower (30m) 0.5° Building Height Limit Sketch 2
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Elevation Angle 3 ° Limit Line of Building Height Horizontal Plane Ground A H 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
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