Patent ID: 7203500

Claim:
A method comprising: exchanging two or more ultrawideband (UWB) signals with one or more target device(s), each device recording a transmission strobe time and a receive strobe time associated with the transmission and reception of such signal(s); exchanging the recorded transmission strobe time(s) and receive strobe time(s) associated with the exchanged UWB signals from which one or more of a signal propagation time, timing offset and frequency offset are computed; and computing as a frequency offset between two devices a ratio of the clock frequency of the first device with respect to the second device using the transmission and receive strobe times associated with the exchange of a number (N) of ranging messages, in accordance with the followings equation: f o = T1 TA - T3 TA T1 RB - T3 RB ⇒ f o ⁢ T1 RB - f o ⁢ T3 RB = T1 TA - T3 TA where: TN TA is the recorded time of transmit of message N (1 . . . 3) at a first device (A); TN RB is the recorded time of reception of message N at a second device (B); and f o is the frequency offset.