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4.2.3 4.2.3

This mode is identical to the “sensitivity” mode since the only difference is that the Blocking value (relative to the noise floor) is provided in dB. The software processes the information using exactly the same method to obtain the value of the receiver attenuation (see Figure 12see A8.7).

The function block_{Protection Ratio}(Df) that you entered represents the protection ratio, i.e. the ratio of maximum acceptable level of interfering signal to the wanted signal level, at a given frequency separation.

In this case SEAMCAT calculates the receiver attenuation a_VLR(Df) to be applied to the interfering signal by using the following expression (see Figure 109105):

...

(Eq. 24)   

                       

Mathinline
body Attenuation (f) = blockProtection Ratio(f) (dB) + C/(N+I) (dB) + (N+I)/N (dB) – I/N (dB)

...

   

                       

Mathinline
body Attenuation (f ) = 40 + 16 + 3 - 0 = 59

...

dB

Mathinline
body iRSSblocking = Interfering Signal Level (f it ) = -54.5 - 59 = -113.5 dBm

...

     

                                            

 

Figure 109

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F105 F105

Figure 105: Mean iRSS_blocking in case of Protection-ratio mode