Abstract: A tyre monitoring device, tyre monitoring system and method including a wireless interface having range determining capability and a processor. The processor: receives a command via the wireless interface from a second device of the tyre monitoring system; determines a range to the second device; and executes the command if the range to the second device is less than a predetermined threshold.

Abstract: A method to correct the drift in the phase shift between first and second signals, the first and second signals generated by a signal having frequency Fe, the drift in the phase shift resulting from a drift in the frequency Fe, according to a given relationship. In one embodiment, the method includes the steps of (1) determining a value of the phase shift from a phase of the first signal and a phase of the second signal, (2) estimating the value of the frequency Fe, and (3) adjusting the phase shift to a value within an interval of angular values containing the angular value obtained for a reference value, using the phase shift, the estimated value of the frequency, and the given relationship.

Abstract: Disclosed is a method to correct the drift in the phase shift (&Dgr;&PHgr;,&thgr;) between two signals (S1) and (S2), said signals being generated by a signal having a reference frequency Fe or a corresponding period &OHgr;, the drift in the phase shift resulting from a drift in frequency Fe or in period, according to a given relationship R((F,&OHgr;), (&thgr;, &Dgr;&PHgr;)).