A method for jamming, using a number K of jammers that is at least equal to one, signals of the GNSS type received by a first group, comprising a number N, which is at least equal to one, of mobile receivers i with known positions within a given geographic area, said mobile receivers being adapted to receive at least one GNSS signal transmitted according to a given waveform in order to support a service I, said jammers k being adapted to generate at least one jamming signal s having a power J k,s that is at most equal to a maximum power J k max, said jamming signal being adapted to jam said GNSS signal supporting said service I, said method being characterised in that it comprises at least the following steps: ∘ determining, for each of said mobile receivers i and for each of said GNSS signals received by said receiver i, an operating margin Δ N i, l = G l. C l η. L R − N th. F R, as a function of the gain G I procured by the antenna of said receiver i on the GNSS signal that it receives, of the power C I of the received GNSS signal before the antenna of said receiver i, with L R being a term modelling the power losses inside said receiver i, F R being the noise factor of said receiver i, N th being the thermal noise power that affects the GNSS signal received by said receiver i and η being the minimum value of the signal-to-interference-plus-noise ratio below which said receiver i no longer receives said GNSS signal; ∘ determining, using a computation step, the optimal power J k,s that is assigned to each jamming signal s produced by each of said jammers k and that complies with the following constraints: ▪ the total jamming power J = ∑ k = 1 K ∑ s = 1 S J k, s is as low as possible, with S being the number of different jamming signals generated by said jammer k; ▪ the following jamming constraint is complied with for each receiver i and for each GNSS I service used by said receiver i: ∑ k = 1 K ∑ s = 1 S GE k, i. P k, i. SSC I k, s, l. J k, s / A k, i ≥ Δ N i, l i = 1,..., N, with GE k,i being the gain of the antenna of said jammer k towards said receiver i, P k,i being the level of rejection of the jamming signal by the antenna of said jammer k, A k,i being a term modelling the propagation losses between said jammer k and said receiver i, SSC I k,s,l being the spectral correlation coefficient between the jamming signal and the signal that supports the service I and is received by said receiver i. ∘ determining, for each of said mobile receivers i and for each of said GNSS signals received by said receiver i, an operating margin Δ N i, l = G l. C l η. L R − N th. F R, as a function of the gain G I procured by the antenna of said receiver i on the GNSS signal that it receives, of the power C I of the received GNSS signal before the antenna of said receiver i, with L R being a term modelling the power losses inside said receiver i, F R being the noise factor of said receiver i, N th being the thermal noise power that affects the GNSS signal received by said receiver i and η being the minimum value of the signal-to-interference-plus-noise ratio below which said receiver i no longer receives said GNSS signal; ∘ determining, using a computation step, the optimal power J k,s that is assigned to each jamming signal s produced by each of said jammers k and that complies with the following constraints: ▪ the total jamming power J = ∑ k = 1 K ∑ s = 1 S J k, s is as low as possible, with S being the number of different jamming signals generated by said jammer k; ▪ the following jamming constraint is complied with for each receiver i and for each GNSS I service used by said receiver i: ∑ k = 1 K ∑ s = 1 S GE k, i. P k, i. SSC I k, s, l. J k, s / A k, i ≥ Δ N i, l i = 1,..., N, with GE k,i being the gain of the antenna of said jammer k towards said receiver i, P k,i being the level of rejection of the jamming signal by the antenna of said jammer k, A k,i being a term modelling the propagation losses between said jammer k and said receiver i, SSC I k,s,l being the spectral correlation coefficient between the jamming signal and the signal that supports the service I and is received by said receiver i. ▪ the total jamming power J = ∑ k = 1 K ∑ s = 1 S J k, s is as low as possible, with S being the number of different jamming signals generated by said jammer k; ▪ the following jamming constraint is complied with for each receiver i and for each GNSS I service used by said receiver i: ∑ k = 1 K ∑ s = 1 S GE k, i. P k, i. SSC I k, s, l. J k, s / A k, i ≥ Δ N i, l i = 1,..., N, with GE k,i being the gain of the antenna of said jammer k towards said receiver i, P k,i being the level of rejection of the jamming signal by the antenna of said jammer k, A k,i being a term modelling the propagation losses between said jammer k and said receiver i, SSC I k,s,l being the spectral correlation coefficient between the jamming signal and the signal that supports the service I and is received by said receiver i.