A method for detecting a change in a communications channel system of a motor vehicle with at least one communications channel, the said method comprising the following steps: a) Transmitting an ultra-wideband transmission signal by means of a transmission unit via the communications channel system, b) Receiving at least one reception signal based on the ultra-wideband transmission signal by means of a reception unit, c) Determining at least one channel impulse response of the at least one communications channel of the motor vehicle based on the reception signal by means of a determination unit, - Repeating steps a) to c) several times to determine at least one plurality of channel impulse responses of the at least one communications channel, - Respectively adapting at least a part of the determined channel impulse responses of the plurality of channel impulse responses of the at least one communications channel to a known channel impulse response of the at least one communications channel of the motor vehicle to a respective adapted channel impulse response by means of an adaptation unit in such a way that a correlation coefficient resulting from the determined channel impulse response and the known channel impulse response increases, - Filtering the at least one part of the adapted channel impulse responses at least of the at least one communications channel in a time direction by means of a filter unit to obtain a specific filter signal of the filtered, adapted channel impulse responses of the at least one communications channel, - Detecting the change in the communications channel system at least on the basis of the specific filter signal of the at least one communications channel by means of a detection unit. a) Transmitting an ultra-wideband transmission signal by means of a transmission unit via the communications channel system, b) Receiving at least one reception signal based on the ultra-wideband transmission signal by means of a reception unit, c) Determining at least one channel impulse response of the at least one communications channel of the motor vehicle based on the reception signal by means of a determination unit, - Repeating steps a) to c) several times to determine at least one plurality of channel impulse responses of the at least one communications channel, - Respectively adapting at least a part of the determined channel impulse responses of the plurality of channel impulse responses of the at least one communications channel to a known channel impulse response of the at least one communications channel of the motor vehicle to a respective adapted channel impulse response by means of an adaptation unit in such a way that a correlation coefficient resulting from the determined channel impulse response and the known channel impulse response increases, - Filtering the at least one part of the adapted channel impulse responses at least of the at least one communications channel in a time direction by means of a filter unit to obtain a specific filter signal of the filtered, adapted channel impulse responses of the at least one communications channel, - Detecting the change in the communications channel system at least on the basis of the specific filter signal of the at least one communications channel by means of a detection unit. - Repeating steps a) to c) several times to determine at least one plurality of channel impulse responses of the at least one communications channel, - Respectively adapting at least a part of the determined channel impulse responses of the plurality of channel impulse responses of the at least one communications channel to a known channel impulse response of the at least one communications channel of the motor vehicle to a respective adapted channel impulse response by means of an adaptation unit in such a way that a correlation coefficient resulting from the determined channel impulse response and the known channel impulse response increases, - Filtering the at least one part of the adapted channel impulse responses at least of the at least one communications channel in a time direction by means of a filter unit to obtain a specific filter signal of the filtered, adapted channel impulse responses of the at least one communications channel, - Detecting the change in the communications channel system at least on the basis of the specific filter signal of the at least one communications channel by means of a detection unit.