On-line Calculator Tools

These calculators are offered as useful on-line tools for the following functions:-

Calculate radar horizon

This routine calculates the approximate over-water radar horizon given the antenna height and the target height in metres above sea level. The actual value will vary somewhat, depending on relative bearing, latitude and atmospheric conditions:-

 

Radar height

meters

km/nM

 

Target height

meters

Horizon

 

 

Power versus range calculations

 

1)

Calculation of the maximum range from the ESM platform to the radar given the radar ERP in dBW, the ESM sensitivity in dBmi and the radar frequency in MHz:-

 

 

 

 
 

Radar ERP

dBW

km/nM

 

ESM sensitivity

dBmi

Range

 

Radar frequency

MHz

 

2)

Calculation of the maximum range from the ESM platform to the radar given the radar ERP in dBW and the ESM Sensitivity in dBW/m2 :-

 

 

 

Radar ERP

dbW

km/nM

 

ESM sensitivity

dBW/m2

Range

 

3)

Calculation of power received in dBmi given the radar range, radar ERP in dBW and radar frequency in MHz:-

 

 

 

Radar range

 
 

Radar ERP

dBW

Power received

 

Radar frequency

MHz

 

4)

Calculation of power received in dBW/m2 given the radar range and radar ERP in dBW:-

 

 

 

Radar range

Power received

 

Radar ERP

dBW


 

Conversion from dBW/m2 to dBmi

 
 

Power received

dBW/m2

Power received

 

Radar frequency

MHz

 

 

 

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