According to the theory of generation of the sub-carriers in FM stereo broadcast

an analysis of the spectra and ambiguity functions of FM stereo signals is made.The authors point out that there are correlation peaks in the zero distance section planes of ambiguity functions of FM stereo broadcast signals with sub-carriers with a period of one half of the frequency of the pilot signals

and the Doppler section planes of ambiguity functions of FM stereo broadcast signals with sub-carriers are weighted summation of those of ambiguity functions of FM stereo broadcast signals without sub-carriers

and there are multi-peaks(correlation peak) in the ambiguity functions of the broadcast signals with sub-carriers and narrow bandwidth.The method of cancellation of the multi-peaks and the results of processing of the recorded data are also presented.