A method for detecting the start of a frame of a communication signal, said frame including a preamble corresponding to a predetermined sequence of binary symbols, said method including: • a sampling of the signal, • a filtering for shaping the samples obtained directly at the output of the sampling, • a first phase for estimating an approximate frequency error of the signal and a candidate first sample for the start of the frame, said first phase including: o for each of a plurality of predetermined frequency hypotheses: a correlation between the samples obtained after shaping filtering and at least one portion of the preamble, o an estimation on the one hand of a candidate first sample for the start of the frame corresponding to a sample for which the best correlation value obtained among the different frequency hypotheses is higher than a predetermined threshold and, on the other hand, of the approximate frequency error from the frequency hypothesis having provided the best correlation value, the method being characterized in that it includes: • a temporal recording of the samples obtained at the output of the sampling or at the output of the shaping filtering in a buffer memory while the first phase is executed, • a second phase for accurately estimating a final candidate sample for the start of the frame, said second phase including: o a frequency correction applied to the samples obtained at the output of the buffer memory, said frequency correction being determined from the approximate frequency error estimated at the first phase, o a correlation between the corrected samples and the preamble for a limited set of samples comprising the candidate first sample, o a determination of the final candidate sample for the start of the frame corresponding to the sample for which the best correlation value is obtained. • a sampling of the signal, • a filtering for shaping the samples obtained directly at the output of the sampling, • a first phase for estimating an approximate frequency error of the signal and a candidate first sample for the start of the frame, said first phase including: o for each of a plurality of predetermined frequency hypotheses: a correlation between the samples obtained after shaping filtering and at least one portion of the preamble, o an estimation on the one hand of a candidate first sample for the start of the frame corresponding to a sample for which the best correlation value obtained among the different frequency hypotheses is higher than a predetermined threshold and, on the other hand, of the approximate frequency error from the frequency hypothesis having provided the best correlation value, o for each of a plurality of predetermined frequency hypotheses: a correlation between the samples obtained after shaping filtering and at least one portion of the preamble, o an estimation on the one hand of a candidate first sample for the start of the frame corresponding to a sample for which the best correlation value obtained among the different frequency hypotheses is higher than a predetermined threshold and, on the other hand, of the approximate frequency error from the frequency hypothesis having provided the best correlation value, • a temporal recording of the samples obtained at the output of the sampling or at the output of the shaping filtering in a buffer memory while the first phase is executed, • a second phase for accurately estimating a final candidate sample for the start of the frame, said second phase including: o a frequency correction applied to the samples obtained at the output of the buffer memory, said frequency correction being determined from the approximate frequency error estimated at the first phase, o a correlation between the corrected samples and the preamble for a limited set of samples comprising the candidate first sample, o a determination of the final candidate sample for the start of the frame corresponding to the sample for which the best correlation value is obtained. o a frequency correction applied to the samples obtained at the output of the buffer memory, said frequency correction being determined from the approximate frequency error estimated at the first phase, o a correlation between the corrected samples and the preamble for a limited set of samples comprising the candidate first sample, o a determination of the final candidate sample for the start of the frame corresponding to the sample for which the best correlation value is obtained.