Patent ID: 6823284
Filing Date: 2004-11-23
Classification: G01S,H04W

Abstract:
An apparatus for determining a propagation time of a transmit signal transmittable via a channel as a request signal and a response signal, the apparatus comprising:a timing-control unit for starting a timer providing a local counter value when transmission of the request signal begins; a correlator for determining a timing reference within the reception of the response signal; and a general-control unit coupled to the timing-control unit and the correlator for stopping the timer in response to the detection of the timing reference by the correlator, the general-control unit is adapted to derive the propagation time of the transmit signal based on the local counter value, a remote counter value that depends on the request signal, and a determinable time-delay value, the remote counter value represents an inter-time-delay between the reception of the request signal and the start of transmission of the response signal.