Device and method for controlling access to at least one machine

A method for controlling access to at least one machine, wherein

• a portable object transmits via at least one first transmitter via a wireless radio link a first signal, a second wireless radio transceiver provided with a device for locking and unlocking of the machine receives the first signal,
• the first transmitter transmits the first signal,
• a third control member, which is connected to the second wireless radio transceiver causes, when the second wireless radio transceiver has received the first signal, transmission of a second signal by the second wireless radio transceiver to a fourth wireless radio receiver borne by the portable object, capable of receiving the second signal,
• a fifth control member of the portable object which is connected to the first transmitter and to the fourth wireless radio receiver, causes, when the fourth wireless radio receiver has received the second signal, transmission of a third signal by the first transmitter to the second wireless radio transceiver,
• the second wireless radio transceiver receives the third signal,
• the third control member and/or fifth control member being connected to a sixth calculator member for calculation of a distance between the portable object and the device for locking and unlocking of the machine from the second and third signals and/or from the first and second signals,
• the sixth calculator member for calculation of the distance being connected to a seventh comparator for comparison of the distance having been calculated to a prescribed value of distance, the seventh comparator being connected to the third control member,
• an eighth supply member of the portable object autonomously supplies the first transmitter, the fourth wireless radio receiver and the fifth control member with power, the device for locking and unlocking of the machine comprising a ninth calculator member for calculation of an angle of arrival of the first signal and/or of the third signal and a tenth comparator for comparison of the angle of arrival having been calculated to at least one prescribed angular range,
• the seventh comparator and the tenth comparator being connected to the third control member,
• the seventh comparator and the tenth comparator cause, when the tenth comparator has determined that the angle of arrival having been calculated is in the prescribed angular range and when the seventh comparator has determined that the distance having been calculated is less than the prescribed value of distance, the action of unlocking of the machine, and cause, when the tenth comparator has determined that the angle of arrival having been calculated is not in the prescribed angular range and/or when the seventh comparator has determined that the distance having been calculated is greater than the prescribed value of distance, an action of locking of the machine.