Patent ID: 8428615

Claim:
A method for determining a position of a first apparatus, comprising: transmitting a first signal from a second apparatus to the first apparatus; transmitting a second signal from the first apparatus to the second apparatus as a response to the first signal received by the first apparatus, the first signal and the second signal each being transmitted by way of a transmit path wherein the transmit path comprises two different mediums; measuring a signal strength of the second signal received by the second apparatus; measuring a transfer time from a first time of transmission of the first signal to a second time of receipt of the second signal; and calculating the position of the first apparatus as being a first possible position of the first apparatus as determined as a function of the measured signal strength of the received second signal when the first possible position as determined as a function of the measured signal strength is the same as a second possible position of the first apparatus as determined separately as a function of the measured transfer time of the received second signal.