Abstract: The method comprises, at each receiver of the system, the steps of making a comparison, modulo the number of bits contained in a frame of transmitted data, of the value of each of the bits received with the pre-supposed values of the synchronization bits, totalizing the results of the comparisons made on each bit and identifying, in the received bits, the bit positions modulo the number of bits contained in a frame for which the totals obtained are greater than an adjustable threshold value, modulo the number of bits contained in a frame, as a function of the number of comparisons already made for each bit of a frame and adapted according to the probabilities of false alarms and of non-detection which characterize the transmission.