System method and a detecting device related to robotic working tools for detecting a break in a robotic work tool system boundary wire

摘要

The present disclosure relates to a robotic work tool system where a base station 5 feeds a signal to a boundary wire 7, and a robotic tool 3 detects, by means of the signal, the boundary wire in order to stay within a work area 9 defined by the latter. The emitted signal has a high relative bandwidth. If there is a break in the wire, the location of this break can be detected by measuring the emitted signal’s absolute phase.