Merwe, J.R. van derJ.R. van derMerweGarzia, F.F.GarziaRügamer, A.A.RügamerVidal, I.C.I.C.VidalFelber, W.W.Felber2022-03-152022-03-152020https://publica.fraunhofer.de/handle/publica/41197510.23919/ENC48637.2020.93175182-s2.0-85100525982Interference events in the global navigation satellite system (GNSS) spectrum are becoming commonplace. Therefore, the likelihood of receiving multiple simultaneous interference signals is increasing. A common approach to such complex scenarios is to cascade multiple mitigation processors. This paper analyses the response of cascaded adaptive notch filtering (ANF) against two simultaneous frequency-modulated continuous-wave (FMCW) interferences. Results show that if the amplitude differences between the FMCW interferences are sufficient, then a cascaded approach can be successful. However, if the amplitudes are similar, then an ANF would lock onto the wrong frequency-typically a frequency between the two interferences-causing significant performance losses. This effect emphasizes the need for more advanced interference mitigation methods to overcome these limitations, such as the use of multi-spectral methods.en621006conference paper