Patent ID: 6414633
Filing Date: 2002-07-02
Classification: G01S

Abstract:
A device for localising a transmitter unit (2), comprising a base unit (1) and at least one such transmitter unit (2), wherein said transmitter unit (2) comprises means (4), which enable attachment of the transmitter unit (2) to an object (3), and a transmitter member (6), which is arranged to transmit a signal having a determined frequency content, wherein the base unit (1) is arranged to receive said signal and comprises at least two antennas (7), which are positioned on a relatively small distance (a) from each other and each arranged to sense such signal, and wherein the base unit (1) comprises a processing member (9), which is arranged to calculate at least the direction to said transmitter unit (2) by means of the signal sensed by the antennas (7), characterised in that said transmitter unit (2) comprises a receiver member (17), the base unit (1) comprises a transmitter member (18), and the transmitter member (18) of the base unit (1) and the receiver member (17) of the transmitter unit (2) are arranged to communicate by means of a protocol.