Patent ID: 8199054

Claim:
Method for estimating the distance between a transmitter and at least one receiver, the transmitter having radio transmission circuitry which is operable which comprises an RF part which is actually designed for operating in a first operation mode for transmitting a first signal type within a first bandwidth but which is also operable in a second operation mode for transmitting a second signal type comprising at least a ranging component which occupies a second bandwidth which encompasses and exceeds the first bandwidth, the method comprising the steps of: a) operating said RF part of the radio transmission circuitry in said second operation mode, b) transmitting a signal of said second signal type comprising said ranging component by means of said part purposely controlling transient behavior of at least on circuitry component of the RF part of the radio transmission circuitry, c) receiving said signal of said second signal type on said at least one receiver, d) estimating the distance between said transmitter and each receiver from said ranging component in each received said signal.