Patent ID: 9152908
Filing Date: 2015-10-06
Classification: E21D,E21F,G01S,G06K

Abstract:
1. A method for locating persons or mobile machines in a mine cavern using RFID technology; comprising: providing a plurality of base stations arranged in a distributed manner along the mine cavern to be monitored, one or more of the base stations having a transmitter and one or more receivers; providing at least one RFID transponder associated with the person or machine to be located, the RFID transponder having stored identification data, is activable using the base station and readable in a contactless manner using the receivers; wherein the transmitters of adjacently positioned base stations along a region of the mine cavern to be monitored successively emit their transmission wave in order to activate an RFID transponder; wherein a signal strength of the transmission wave from each transmitter is changeable and is changed in order to determine a distance between a detected RFID transponder and a nearest base station.