Methods and devices for determining a distance value representing a transit time and/or a spacing between at least two transceivers, in particular by a motor vehicle and by a vehicle key

A vehicular key system, comprising:

• a first transceiver having at least one antenna for transferring messages;
• a second transceiver having a first antenna and a second antenna for transferring messages with the first transceiver;
• at least one evaluation unit configured to determine a first distance value using messages transferred by the at least one antenna and to determine at least one second distance value using messages transferred by the at least one antenna,
• a selection unit configured to select the smallest distance value from the last determined distance values of the first and second distance values;
• wherein the selection unit is configured to select the smaller of the last two determined distance values of the first and second distance values in response to a distance value being determined from messages received by both the first antenna and the second antenna;
• and
• wherein the selection unit is configured to determine the last distance value from messages received by the first antenna in response to a distance value being undeterminable from the last transmitted messages received by the second antenna.