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 π;^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: J tot ⁢ / ⁢ S tot = ( ∑ p = 1 P ⁢ P p ) ⁢ / ⁢ ( ∑ u = 1 U ⁢ P u ) J tot ⁢ / ⁢ S u = ( ∑ p = 1 P ⁢ P p ) ⁢ / ⁢ P u J u ⁢ / ⁢ S u = ( ∑ p = 1 P ⁢ P pu ) ⁢ / ⁢ P u comparing at least one of the three ratios with a threshold value.