A time estimator determines a first aggregate elapsed time between the transmission of the first transmission signal to a first beacon and receipt of a return signal, a second aggregate elapsed time between the transmission of the first transmission signal to a second beacon and receipt of a return signal,...http://www.google.fr/patents/US7647177?utm_source=gb-gplus-shareBrevet US7647177 - System and method for determining a position of a vehicle
System and method for determining a position of a vehicle
