A method for estimating the unambiguous Doppler frequency fd c of a moving target illuminated by a radar beam emitted in the form of a plurality of pulse patterns at a given repetition frequency f m, each pattern comprising a plurality of elementary pulses that are evenly temporally spaced apart, each elementary pulse occupying a frequency band centred on a different frequency, said method comprising a step of acquiring the signal backscattered by said target and being characterised in that it further comprises the following steps: • a first step, executed for each received pattern, of correcting spurious phase errors affecting each elementary pulse of a pattern, of compressing pulses of said pattern and of correcting migrations from the target by distance and by Doppler frequency, under the assumption that the Doppler frequency fd c of said target is equal to that of the point (M 0) on the ground towards which the radar beam points, said step resulting in the generation of a two-dimensional signal representing the received signal, on the one hand as a function of the distance between said target and said radar and on the other hand as a function of the received pattern; • a second step of computing a direct Fourier transform on said signal originating from said first step, so as to obtain a two-dimensional representation of the spectrum of said received signal, on the one hand as a function of the distance between said target and said radar and on the other hand as a function of the Doppler frequency; • a third step of determining the ambiguous Doppler frequency fdA c of said target on the basis of said spectral representation; • a fourth step of re-centring said spectral representation and of adjusting said corrections carried out during said first step on the basis of said ambiguous Doppler frequency fdA c, so as to obtain a radar image of said target; • a fifth step of determining the range of ambiguity of the Doppler frequency fdA c as being that which is among the possible ranges of ambiguity, allowing the radar image with the highest degree of focusing to be obtained. • a first step, executed for each received pattern, of correcting spurious phase errors affecting each elementary pulse of a pattern, of compressing pulses of said pattern and of correcting migrations from the target by distance and by Doppler frequency, under the assumption that the Doppler frequency fd c of said target is equal to that of the point (M 0) on the ground towards which the radar beam points, said step resulting in the generation of a two-dimensional signal representing the received signal, on the one hand as a function of the distance between said target and said radar and on the other hand as a function of the received pattern; • a second step of computing a direct Fourier transform on said signal originating from said first step, so as to obtain a two-dimensional representation of the spectrum of said received signal, on the one hand as a function of the distance between said target and said radar and on the other hand as a function of the Doppler frequency; • a third step of determining the ambiguous Doppler frequency fdA c of said target on the basis of said spectral representation; • a fourth step of re-centring said spectral representation and of adjusting said corrections carried out during said first step on the basis of said ambiguous Doppler frequency fdA c, so as to obtain a radar image of said target; • a fifth step of determining the range of ambiguity of the Doppler frequency fdA c as being that which is among the possible ranges of ambiguity, allowing the radar image with the highest degree of focusing to be obtained.