Transponder module for determination of a crossing time in a measuring system

A transponder module intended to be disposed on a moving object for determination of a crossing time on a line of passage for a sports competition of a measuring system, the system comprising at least one transmission unit of a low-frequency electromagnetic field signal via an antenna disposed at the level of the line of passage, and a decoder unit, in order at least to receive at least one measurement signal from the activated transponder module near the line of passage, the transponder module comprising a low-frequency signal receiver in order to receive the electromagnetic field signal via a receiving antenna in order to be woken up by said electromagnetic field signal, a microcontroller receiving a receiving signal from the receiver, at least one transmitter linked to the microcontroller for transmission via a high-frequency antenna of at least one measurement result in a high-frequency measurement signal,

• wherein the transponder module comprises a time base in the microcontroller, the time base being activated upon receiving the electromagnetic field signal, and
• wherein the microcontroller, once woken up, is capable of measuring several successive intensities of the captured electromagnetic field signal in order to reconstruct an electromagnetic field curve and to determine a crossing time of the transponder module with the activated time base thereof, in order to transmit, to the decoder unit of the measurement system, the result of the crossing time determined by the microcontroller.