Device for checking access permissions
A device for checking access permissions includes an access area with guidance devices for forming an access lane for separating people or objects, in which blocking and/or signal means define an access threshold. A gate controller having a Bluetooth radio interface allows an access permission to be read from mobile data carriers, and positive validation of the access permission results in the access controller releasing the blocking and/or signal means and thus allowing separate passage through the access threshold. An access lane has an associated multiphase antenna group, the transmission/reception antennas of which are actuated by a Bluetooth transceiver module via an antenna feed network in such a way that at least two antenna lobes form that are at different distances from the access threshold as seen in the direction of access.
1. A device for checking access permissions comprises:
an access area including:
guiding devices defining an access lane for separating people or objects,
a blocking and/or signal element defining an access threshold, and
an access controller including a Bluetooth interface configured to read an access permission from mobile data carriers,
wherein the access controller and the blocking and/or signal element are configured such that, when a positive validation of the access permission is received, the access controller releases the blocking and/or signal element and thus allows separate passage through the access threshold, and
a multiphase antenna array, including transmitting/receiving antennas configured to be actuated by a Bluetooth transceiver via an antenna network to generate at least two antenna beams at different distances from the access threshold with respect to an access direction, the at least two antenna beams including a first antenna beam and a second antenna beam located a greater distance from the access threshold than is the first antenna beam,
wherein the Bluetooth transceiver is configured to continuously transmit short signals via the second antenna beam located at the greater distance from the access threshold than is the first antenna beam so as to activate a Bluetooth interface of an approaching mobile data carrier, every approaching mobile data carrier with access permission being assigned a unique identifier or permission identifier to be read via a ticket app to be activated by the Bluetooth interface,
wherein the access controller is configured to retrieve the unique identifier or permission identifier from the ticket app of the approaching mobile data carrier via the first antenna beam located a shorter distance from the access threshold than is the second antenna beam, and to measure a received signal strength indicator of a signal transmitted by the mobile data carrier at the first antenna beam, and
wherein the access controller is further configured to, when a positive assessment of the received signal strength indicator and a positive validation of the unique identifier or permission identifier of the approaching mobile data carrier is received, generate a release signal sent to the blocking and/or signal element to open the blocking and/or signal element.
2. The device according to claim 1 , wherein the Bluetooth transceiver is configured to generate a release signal by linking validation information and an item of position information from an evaluation of triangulation values of the antenna array.
3. The device according to claim 1 , wherein the multiphase antenna array having transmitting/receiving antennas to be actuated by the Bluetooth transceiver comprises at least two antenna modules arranged at a distance of λ/2 of the wavelength relative to one another with respect to the access direction, the multiphase antenna array having the transmitting/receiving antennas includes switches and phase shifters between an input of the antenna network and the at least two antenna modules to generate the at least two antenna beams at different distances from the access threshold.
4. The device according to claim 3 , wherein the multiphase antenna array having transmitting/receiving antennas to be actuated by the Bluetooth transceiver comprises four antenna modules arranged at a distance of λ/2 of the wavelength relative to one another.
5. The device according to claim 1 , wherein:
the guiding devices delimit an access lane with a width of less than one meter,
a Bluetooth antenna array is arranged on at least one side of the access lane immediately in front of the access threshold,
the Bluetooth antenna array comprises at least two antenna modules arranged at a center-to-center distance of λ/2 of the wavelength of the Bluetooth frequency from one another with respect to the access direction, and
the antenna network is configured to generate the at least two directed antenna beams within one meter in front of the access threshold, the first antenna lying closer to the access threshold than is the second antenna with respect to the access direction.
6. The device according to claim 5 , wherein:
the guiding devices delimit an access lane with a width of 60 cm,
the Bluetooth antenna array is arranged within one meter in front of the access threshold,
the multiphase antenna array comprises four antenna modules arranged at a center-to-center distance of λ/2 of the wavelength of the Bluetooth frequency from one another with respect to the access direction, and
the antenna network is configured to generate the at least two antenna beams within one meter in front of the access threshold.