Importance

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Abstract

The invention relates to a symmetrical multi-path method for determining the spatial distance between two transmitter-receivers. Both transmitter-receivers set off at least one signal round in each case. A signal round comprises the steps: a) transmitting at least one request data frame of a first transmitter-receiver to a second transmitter-receiver at a request transmitting time (T.sub.TA1, T.sub.TB2), b) receiving the request data frame at the second transmitter-receiver at a request receiving time (T.sub.RB1, T.sub.RA2), c) transmitting a reply data frame from the second transmitter-receiver to the first transmitter-receiver at a reply transmitting time (T.sub.TB1, T.sub.TA2), which has a respective reply time interval (T.sub.replyB1, T.sub.replyA2) from the request receiving time (T.sub.RB1, T.sub.RA2) and detecting the reply time interval, d) receiving the reply data frame at the first transmitter-receiver setting off the signal round and detecting an allocated reply receiving time (T.sub.RA1, T.sub.RB2). The signal rounds are performed in such a way that the reply time intervals (T.sub.replyA2, T.sub.replyB1) are either identical or have a difference, in the case of performing more than one signal round set off by each transmitter-receiver an average difference, the amount of which is a maximum of 200 microseconds.

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First Claim