Method for operating a radio-based monitoring system of a transportation vehicle and monitoring system and transmitting and receiving unit for the monitoring system

A tag unit for a wireless-based monitoring system for monitoring a transportation vehicle, wherein the monitoring system comprises a central control unit and a plurality of the mobile, portable tag units, tag unit comprising:

• a position sensor apparatus;
• and
• a distance measuring apparatus,
• wherein the tag units are held in the transportation vehicle by respective retention devices, each retention device respectively having a mechanical encoding through which a spatial orientation of the held tag unit is specified,
• wherein the spatial orientation of the held tag unit is characteristic of the installation position of the retention device in the transportation vehicle,
• wherein each tag unit determines its spatial orientation and, thereby, its characteristic position in the transportation vehicle by its own position sensor apparatus, and transmits the characteristic position via wireless connection to the central control unit,
• wherein, in a monitoring mode of the monitoring system, each tag unit, by its own distance measuring apparatus, repeatedly captures a distance from at least one predetermined object and signals the distance via wireless connection to the central control unit,
• wherein, the central control unit determines a respective object position of the at least one object based on the respective characteristic position of one or more of the plurality of tag units and the distances transmitted, and controls at least one predetermined transportation vehicle security function based on the determined object position.

A transportation vehicle with a wireless-based monitoring system for monitoring a transportation vehicle, wherein the monitoring system comprises:

• a central control unit;
• a plurality of mobile, portable tag units each including its own position sensor apparatus and its own distance measuring apparatus;
• and
• a plurality of retention devices, each corresponding to a respective tag unit of the plurality of mobile, portable tag units, wherein each of the retention devices respectively comprises a mechanical encoding through which a spatial orientation of the held tag unit is specified, wherein the spatial orientation of the held tag unit is unique for the installation position of the respective retention device in the transportation vehicle, wherein the spatial orientation of the held tag unit is characteristic of the installation position of the retention device in the transportation vehicle,
• wherein each tag unit determines its spatial orientation and, thereby, its characteristic position in the transportation vehicle by its own position sensor apparatus, and transmits the characteristic position via wireless connection to the central control unit,
• wherein, in a monitoring mode of the monitoring system, each tag unit, by its own distance measuring apparatus, repeatedly captures a distance from at least one predetermined object and signals the distance via wireless connection to the central control unit, and
• wherein, the central control unit determines a respective object position of the at least one object based on the respective characteristic position of one or more of the plurality of tag units and the distances transmitted, and controls at least one predetermined transportation vehicle security function based on the determined object position.

A method for operating a wireless-based monitoring system of a transportation vehicle, wherein a central control unit and a plurality of mobile, portable tag units are made available by the monitoring system and the tag units are held in the transportation vehicle by a respective retention device, the method comprising:

• each tag unit determining its spatial orientation by its own position sensor apparatus, wherein the tag units are held in the transportation vehicle by respective retention devices, each retention device respectively having a mechanical encoding through which a spatial orientation of the held tag unit is specified, wherein the spatial orientation of the held tag unit is characteristic for the installation position of the retention device in the transportation vehicle;
• each tag determining its characteristic position in the transportation vehicle based on the determined spatial orientation and thereby its characteristic position in the transportation vehicle;
• each tag transmitting its characteristic position via wireless connection to the central control unit;
• and
• in a monitoring mode of the monitoring system, each tag unit, by its own distance measuring apparatus, repeatedly capturing a distance from at least one predetermined object and transmitting the measured distance via wireless connection to the central control unit;
• determining, by the central control unit, a respective object position of the at least one object based on the respective characteristic position of at least one or a few of the tag units and of the distances signaled respectively by this tag unit or these tag units;
• and
• controlling at least one predetermined security function in the transportation vehicle depending on the respective determined object position of the at least one object.