Patent ID: 6236836
Filing Date: 2001-05-22
Classification: G01S

Abstract:
A transponder system (B) for localization of an object being provided with a transponder for this system comprising antenna device and a paging receiver (1) having an unique call, further comprisinga built-in marker transmitter (10) having a standby mode, and a working enabling mode during which said marker transmitter (10) is working on a fixed frequency different from the frequency of the paging receiver (1),a unit (2) for decoding of an authorization code and a control information obtained via the paging receiver (1),an electronic logic unit (3) for processing of control information obtained from the decoder (2),a power supply (11) to permit the transponder system (B) and its marker transmitter (10) to operate during a certain minimum time period during the enabling mode, andthat operation of the marker transmitter (10) during the enabling mode is controlled by the logic unit (3) based on remotely transmitted control information obtained from the paging receiver (1) via the unit (2) for decoding.