The level of interference determined by the interferer’s transmit power, the antenna gains and propagation loss, is further decreased due to the receiver blocking performance for a given interferer/victim frequency separation. Details on the iRSS_blocking calculation are given in ANNEX 5:.

Note that from SEAMCAT 5.0.1 onwards, the blocking attenuation is computed at the ILT frequency and that the ILT bandwidth is nowconsidered (see ANNEX 8:). There are 3 ways to calculate the blocking response which are described in more detail in ANNEX 8::

User Defined (dB): Att_Blocking = Block_{UD (dB)}(Eq. 13)

Protection Ratio (dB): Att_Blocking = Block_PR _(dB) + C/(N+I) _(dB) + (N+I)/N _(dB) - I/N _(dB)(Eq. 14)

Sensitivity Mode (dBm): Att_Blocking = Block_Sens _(dBm) – Sensitivity_VLR _(dBm) + C/(N+I) _(dB) – I/N _(dB)(Eq. 15)

Figure 12: Illustration of the blocking of the victim link receiver (i.e. total emission power of ILT reduced by the blocking attenuation (selectivity) function of the VLR

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