A method for the verification of anti-jamming in a communications system comprises several sensors or adaptive antennas, comprising at least the following steps: estimating the mean power .pi.;^.sub.y of the output of the communications system, estimating the respective power values Pu or P'u, of a station u, the antenna noise Pa or P'a, the thermal noise PT, or P'T, estimating at least one of the following ratios: .times..times..times..times..times..times..times..times..times..times..ti- mes..times..times..times..times..times. ##EQU00001## comparing at least one of the three ratios with a threshold value.