An apparatus for analyzing one or several radio systems, comprising: one or several radio-frequency units (120; 220; 22S, 221, 22N) for generating one or several baseband signals from one or several radio signals, a spectral analysis module (130; 230) for performing spectral analysis, wherein one of the one or several baseband signals is transformed to a time-frequency domain in order to obtain a spectrogram in the time-frequency domain, one or several demodulators (140; 241, 24N) for generating two or more demodulated radio packets of the one or several radio systems from the one or several baseband signals, said one or several demodulators (140; 241, 24N) being configured to provide additional information for each of the two or several demodulated radio packets, a spectrogram analyzer (135; 430) for detecting two or several radio packets found in the spectrogram in the time-frequency domain and for establishing one or several characteristics for each of the two or several radio packets found based on the spectrogram in the time-frequency domain, and a synchronization module (170; 470; 471; 472) configured to determine one or several pairs, wherein each of the one or several pairs comprises precisely one demodulated radio packet of the two or more demodulated radio packets and comprising the one or several characteristics of precisely one radio packet found of the two or several radio packets found, wherein the synchronization module (170; 470; 471; 472) is configured to determine each of the one or several pairs such that the one or several characteristics of that radio packet found in the spectrogram of the two or several radio packets found is/are associated to the demodulated radio packet of the pair in that pair which corresponds to the demodulated radio packet of the pair, wherein the synchronization module (170; 470; 471; 472) is configured to determine each of the one or several pairs in dependence on the additional information of the two or several demodulated radio packets and in dependence on the characteristics of the two or several radio packets found, and wherein the synchronization module (170; 470; 471; 472) is configured to output the one or several pairs or information depending on the one or several pairs. one or several radio-frequency units (120; 220; 22S, 221, 22N) for generating one or several baseband signals from one or several radio signals, a spectral analysis module (130; 230) for performing spectral analysis, wherein one of the one or several baseband signals is transformed to a time-frequency domain in order to obtain a spectrogram in the time-frequency domain, one or several demodulators (140; 241, 24N) for generating two or more demodulated radio packets of the one or several radio systems from the one or several baseband signals, said one or several demodulators (140; 241, 24N) being configured to provide additional information for each of the two or several demodulated radio packets, a spectrogram analyzer (135; 430) for detecting two or several radio packets found in the spectrogram in the time-frequency domain and for establishing one or several characteristics for each of the two or several radio packets found based on the spectrogram in the time-frequency domain, and a synchronization module (170; 470; 471; 472) configured to determine one or several pairs, wherein each of the one or several pairs comprises precisely one demodulated radio packet of the two or more demodulated radio packets and comprising the one or several characteristics of precisely one radio packet found of the two or several radio packets found, wherein the synchronization module (170; 470; 471; 472) is configured to determine each of the one or several pairs such that the one or several characteristics of that radio packet found in the spectrogram of the two or several radio packets found is/are associated to the demodulated radio packet of the pair in that pair which corresponds to the demodulated radio packet of the pair, wherein the synchronization module (170; 470; 471; 472) is configured to determine each of the one or several pairs in dependence on the additional information of the two or several demodulated radio packets and in dependence on the characteristics of the two or several radio packets found, and wherein the synchronization module (170; 470; 471; 472) is configured to output the one or several pairs or information depending on the one or several pairs.