Calculate radar horizon
This routine calculates the approximate overwater 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:


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: 





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 : 




3) 
Calculation of power received in dBmi given the radar range, radar ERP in dBW and radar frequency in MHz: 




4) 
Calculation of power received in dBW/m2 given the radar range and radar ERP in dBW: 




Conversion from dBW/m2 to dBmi 
