A method for eliminating in a radar signal (S(t)) received by a radar detector belonging to a platform, a first signal (S 1 (t)) coming from at least one on-board radar belonging to the same platform, the method comprising the following steps: - providing a replica (h(t)) of the signal (E 1 (t)) emitted by the on-board radar, - receiving by the radar detector a signal (S(t)), the received signal (S(t)) being the sum of a first signal (S 1 (t)) depending on the signal (E 1 (t)) emitted by the on-board radar and a second signal (S 2 (t)) independent of the signal (E 1 (t)) emitted by the on-board radar, the first signal (S 1 (t)) being able to be represented by a linear combination of elementary signals each having an amplitude coefficient (A i) and a delay (τ i) relative to the signal (E 1 (t)) emitted by the on-board radar, - processing the received signal (S(t)) to obtain a processed received signal (S T (t)), - determining the amplitude coefficients (A i) and the delays (τ i) of the elementary signals of the first signal (S 1 (t)) relative to the signal (E 1 (t)) emitted by the on-board radar, the determining step being carried out from the provided replica (h(t)) and the processed received signal (S T (t)), the determination step comprising calculating a filter adapted to the signal of the on-board radar from the provided replica (h(t)), the processed received signal (S T (t)), the adapted filter being a function whose extrema are the amplitude coefficients (A i) of the elementary signals of the first received signal (S 1 (t)), and - eliminating, in the processed received signal (S T (t)), the first signal (S 1 (t)) to obtain the second signal (S 2 (t)), the eliminating step being carried out from the provided replica (h(t)), the determined amplitude coefficients (A i) and the determined delays (τ i). - providing a replica (h(t)) of the signal (E 1 (t)) emitted by the on-board radar, - receiving by the radar detector a signal (S(t)), the received signal (S(t)) being the sum of a first signal (S 1 (t)) depending on the signal (E 1 (t)) emitted by the on-board radar and a second signal (S 2 (t)) independent of the signal (E 1 (t)) emitted by the on-board radar, the first signal (S 1 (t)) being able to be represented by a linear combination of elementary signals each having an amplitude coefficient (A i) and a delay (τ i) relative to the signal (E 1 (t)) emitted by the on-board radar, - processing the received signal (S(t)) to obtain a processed received signal (S T (t)), - determining the amplitude coefficients (A i) and the delays (τ i) of the elementary signals of the first signal (S 1 (t)) relative to the signal (E 1 (t)) emitted by the on-board radar, the determining step being carried out from the provided replica (h(t)) and the processed received signal (S T (t)), the determination step comprising calculating a filter adapted to the signal of the on-board radar from the provided replica (h(t)), the processed received signal (S T (t)), the adapted filter being a function whose extrema are the amplitude coefficients (A i) of the elementary signals of the first received signal (S 1 (t)), and - eliminating, in the processed received signal (S T (t)), the first signal (S 1 (t)) to obtain the second signal (S 2 (t)), the eliminating step being carried out from the provided replica (h(t)), the determined amplitude coefficients (A i) and the determined delays (τ i).