A method for determining at least one parameter for the purpose of correlating two objects (10, 20), particularly the distance (r) and/or the relative speed (v) of the two objects (10, 20). A plurality of transmission pulse sequences following one after the after, each with at least one transmission pulse of an electromagnetic signal, forms a series of transmission pulse sequences. The duration of transmission of the individual transmission pulses is varied from transmission pulse sequence to transmission pulse sequence in order to reduce the susceptibility to interference in the determination of the at least one parameter.