Method of checking the association of radio nodes and objects with respect to a radio environment with a radio node number of at least three mutually spaced radio nodes, wherein - each radio node of the radio node number has a respective radio interface and an individual time transmitter, - a respective time offset is present between the time transmitters of the radio nodes, - at least two radio nodes of the radio node number are reference radio nodes, a spacing of each reference radio node from the further reference radio nodes is known and the reference radio nodes form a reference system with a radio environment, - at least one radio node of the radio node number is a test radio node and an association of the at least one test radio node with respect to the radio environment of the reference system is checked, - the method comprises a measuring process, a subsequent evaluating process and a comparison process, - during the measuring process signals are transmitted and received by radio nodes of the radio node amount, - during the measuring process at least two radio nodes of the radio node number operate as transceivers and at least one radio node during the measuring process operates exclusively as a transmitter or exclusively as a receiver or as a transceiver, - the evaluating process comprises a first evaluating step and a second evaluating step, - in the first evaluating step a system transfer function between two radio nodes of the radio node number and/or a time offset between the time transmitters of two radio nodes of the radio node number is or are determined by means of received signals, - in the second evaluating step at least one item of spacing information of an object of the radio environment of the two radio nodes from the two radio nodes is determined as a result on the basis of the system transfer function and/or the time offset from the first evaluating step, - during the evaluating process in a first pass the first evaluating step and the second evaluating step for at least one pair of reference radio nodes are performed at least once, - during the evaluating process in a second pass the first evaluating step and the second evaluating step for a test radio node and a reference radio node are performed at least once, - in the comparison process at least one result of the first pass of the evaluating process is compared with at least one result of the second pass of the evaluating process and - the presence of the test radio node within the radio environment of the reference system based on at least one result of the comparison process is positively or negatively given as association with respect to the radio environment. - each radio node of the radio node number has a respective radio interface and an individual time transmitter, - a respective time offset is present between the time transmitters of the radio nodes, - at least two radio nodes of the radio node number are reference radio nodes, a spacing of each reference radio node from the further reference radio nodes is known and the reference radio nodes form a reference system with a radio environment, - at least one radio node of the radio node number is a test radio node and an association of the at least one test radio node with respect to the radio environment of the reference system is checked, - the method comprises a measuring process, a subsequent evaluating process and a comparison process, - during the measuring process signals are transmitted and received by radio nodes of the radio node amount, - during the measuring process at least two radio nodes of the radio node number operate as transceivers and at least one radio node during the measuring process operates exclusively as a transmitter or exclusively as a receiver or as a transceiver, - the evaluating process comprises a first evaluating step and a second evaluating step, - in the first evaluating step a system transfer function between two radio nodes of the radio node number and/or a time offset between the time transmitters of two radio nodes of the radio node number is or are determined by means of received signals, - in the second evaluating step at least one item of spacing information of an object of the radio environment of the two radio nodes from the two radio nodes is determined as a result on the basis of the system transfer function and/or the time offset from the first evaluating step, - during the evaluating process in a first pass the first evaluating step and the second evaluating step for at least one pair of reference radio nodes are performed at least once, - during the evaluating process in a second pass the first evaluating step and the second evaluating step for a test radio node and a reference radio node are performed at least once, - in the comparison process at least one result of the first pass of the evaluating process is compared with at least one result of the second pass of the evaluating process and - the presence of the test radio node within the radio environment of the reference system based on at least one result of the comparison process is positively or negatively given as association with respect to the radio environment.