Patent ID: 8535183
Filing Date: 2013-09-17
Classification: A63B

Abstract:
1. A system comprising a movable object having sensor means for sensing an electromagnetic field, radio wave emitter means arranged in the movable object, an internal electrical power supply arranged in the movable object to supply power to the radio wave emitter means, and control means for controlling the operation of the radio wave emitter means, the control means being arranged to sample electromagnetic field intensity measured by the sensor means and transmit data relating to the measured field intensity by means of said radio wave emitter means, the system further comprising stationary exciter means arranged for providing the electromagnetic field measured by said sensor means, the stationary exciter means extending at the periphery of a flat target plane along a horizontal crossbar and vertical side posts of a goal delimiting the flat target plane, stationary receiver means for receiving the radio waves from the radio wave emitter means and provide an output accordingly, and data processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the predetermined set of conditions are fulfilled to determine whether the movable object passes the flat target plane.