Distance-determining system, contact-monitoring system, contact-tracking system and method for determining distance and/or tracking contact

A contact-monitoring system at least for a monitoring of an observation of given distances or of minimal distances and/or maximal distances, with a distance-determining system, comprising:

• at least one first monitoring unit;
• and
• at least one second monitoring unit,
• wherein at least the first monitoring unit comprises a transmitter unit that is configured to emit a sound signal, and an electromagnetic signal,
• wherein at least the second monitoring unit comprises a receiver unit that is configured to receive the sound signal and the electromagnetic signal such that a distance between the first monitoring unit and the second monitoring unit can be determined on the basis of a runtime difference between the sound signal received by the receiver unit and the electromagnetic signal received by the receiver unit and allocated to the received sound signal,
• wherein at least the second monitoring unit comprises an alerting device or is connected to an external alerting device in terms of data transmission technology, the alerting device being configured to output an alert signal if a predeterminable minimal distance from the first monitoring unit is gone below, and/or if a predeterminable maximal distance from the first monitoring unit is exceeded,
• with the contact-monitoring system further comprising a grouping function configured to make an activation of the alerting device dependent on a received identifier which is contained in a signal pair comprising a sound signal and an electromagnetic signal and which is bijectively assigned to a further monitoring unit grouped in a common group with the second monitoring unit.

A contact-tracking system at least for a back-tracking of contacts, in particular of chains of infection, with a distance-determining system, with at least one first monitoring unit and with at least one second monitoring unit, wherein at least the first monitoring unit comprises a transmitter unit that is configured to emit a sound signal, and an electromagnetic signal, wherein at least the second monitoring unit comprises a receiver unit that is configured to receive the sound signal and the electromagnetic signal such that a distance between the first monitoring unit and the second monitoring unit can be determined on the basis of a runtime difference between the sound signal received by the receiver unit and the electromagnetic signal received by the receiver unit and allocated to the received sound signal,

• with the contact-tracking system further comprising:
• at least one mobile monitoring unit, which is assigned to a person, with the transmitter unit and with the receiver unit, and
• at least one stationary further monitoring unit, which is fixedly installed in an environment accessible for persons, with a transmitter unit and with a receiver unit,
• and a plurality of stationary monitoring units allocated to a common space, wherein the stationary monitoring units are arranged in the common space such that each point of the common space is always situated within ranges of the transmitter units of at least two stationary monitoring units, such that a bilateration of a position of the at least one mobile monitoring unit that is moved in the space is enabled.