# 1.4.10 Interference calculation

SEAMCAT calculates the probability of interference for generic (i.e. non-cellular) victim systems. Each sample of dRSS and iRSS generated during a simulation is compared against the relevant signal-to-noise criterion (specified in the scenario, such as C/N, C/N+I etc). The probability of interference is calculated for all events where the dRSS is greater than the sensitivity of the victim link receiver (*dRSS* > sens). This probability can be calculated for two different modes, as illustrated in [Figure 271](https://ecowiki.atlassian.net/wiki/spaces/SH/pages/493014/12.9.2+Interference+calculation+GUI#id-12.9.2InterferencecalculationGUI-F271 "https://ecowiki.atlassian.net/wiki/spaces/SH/pages/493014/12.9.2+Interference+calculation+GUI#id-12.9.2InterferencecalculationGUI-F271") of section [12.9.2](https://ecowiki.atlassian.net/wiki/spaces/SH/pages/493014 "https://ecowiki.atlassian.net/wiki/spaces/SH/pages/493014").

- **Compatibility**: This mode provides a single-figure estimate of the probability of interference in a given interference scenario;
- **Translation**: This mode calculates probability of interference as a function of changing one of the following parameters:

1. Transmitter power of the interefering link transmitter;
2. Blocking response level of the victim link receiver;
3. Intermodulation rejection level for the victim link receiver

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/bcUV21dd0kyliZeo-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/bcUV21dd0kyliZeo-image.png)