Learn How to Calculate Satellite Antenna Bearing

Learn How to Calculate Satellite Antenna Bearing

Definition:

Azimuth is an angular measurement, which denotes the rotation of an antenna around a vertical axis. Elevation is the angular distance between earth and satellite and it concerns towards the upward and downward placing of the satellite antenna. This tutorial explains how to calculate the Azimuth and Elevation value of an antenna.

Formula :
Antenna Azimuth and Elevation
Where,
long rx = Receiver Longitude long sat = Satellite Longitude lat rx = Receiver Latitude h = 35,800 km Ro = 6,370 km
Example:

Find the Antenna Azimuth and Elevation if Receiver Longitude, Latitude are 170,o 60 o and Satellite Longitude is 110 o

Given,

Receiver Longitude ( long rx ) = 170 o Receiver Latitude ( lat rx ) = 60 o Satellite Longitude ( long sat ) = 110 o

To Find,

Antenna Azimuth and Elevation

Solution:
Step 1:
Antenna Azimuth Calculation:

Substitute the given values in the formula, = { tan -1 { [ tan((PI/180)*170-110) / sin((PI/180)* 60 ) ] } * (180/PI) } +180 = { tan -1 (1.732/0.86) * 57.29 } + 180 = 1.1071 * 57.29 + 180 = 243.434 o

Step 2:
Antenna Elevation:

= cos(rx_lat*(PI/180))*cos(170-110*(PI/180))-6,370/(6,370+ 35,800) = 0.098944 = sqrt [ 1-pow(cos(rx_lat*(PI/180))* cos(170-110*(PI/180))) ]; = 0.9682 = 180 / PI * tan -1 0.098944 / 0.9682; = 5.834 o


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