Redline Communications Inc. AN30 用户手册

 

 

AN-30 System User Manual 

 

 

 

 

 

 

 
The formula for calculating the radius of the first Fresnel zone, as depicted in Figure 21, 
is given as: 
 

)

2

1

(

*

2

*

1

1

.

72

+

=

 (ft) 

where, 
 

- D1 and D2 are the distances from the terminals to the point of interest (in 
miles), and  
- f is the frequency (in GHz) 

  (Note: multiply results by 0.3048 to obtain a solution in meters) 

 
 
 

 

 
Specific FSL formulas are required to deal with this NLOS phenomenon. There are many 
NLOS calculations available from established institutions including the Institute of 
Electrical and Electronics Engineers (IEEE) and International Telecommunications 
Union (ITU), who are chartered with developing standardized calculations. The Redline 
Link Budget Tool is built upon these formulas; however, it is important to bear in mind 
that the calculations are an estimate only, with relatively large standard deviations (5-15 
dB) depending on the exact deployment scenario and obstacle characteristics.   

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