It is proposed a method of determining a distance between a first and second devices, comprising a transmission by means of a radiofrequency transmission of the first device of a first linear chirp of the period t1 and the band width b1, a first step of estimating a time shift τ1 of the reception of said first chirp by means of a radiofrequency transmission of the second device, a transmission, after a determined duration tp after the reception of said first chirp, a second linear chirp of the period t2 and width of strip b2 by the second device, a second step of estimating a time delay τ2 of the reception of the second chirp by means of the radio frequency transmission of the first device, a step of determining the distance d between the first and second device on the basis of the formula :
