ACOUSTIC POSITIONING SYSTEM AND METHOD

摘要

The present invention relates to an acoustic positioning device comprising acoustic emission means (B1) and acoustic reception means (B2), the device being configured so as to emit a sequence of at least one first acoustic signal S1 and one second acoustic signal S2, separated by a time interval T, and to receive and measure the arrival phase phi1 of S1 and the arrival phase phi2 of S2. According to the invention, the device comprises means for measuring a relative displacement between the acoustic emission means (B1) and the acoustic reception means (B2) comprising means for determining a value of the approximate difference (R2-R1)AUX between, on the one hand the distance R1 travelled by the first acoustic signal S1 between the acoustic emission means and the acoustic reception means, and on the other hand the distance R2 travelled by the second acoustic signal S2 between the acoustic emission means and the acoustic reception means, and means for calculating the relative displacement (R2-R1) between said acoustic emission means and said acoustic reception means as a function of the approximate difference (R2-R1)AUX, of the time interval T and of the arrival phases phi1, phi2 respectively of the first acoustic signal S1 and of the second acoustic signal S2.