To deal with the problem of basic waveforms extraction in multifunction radar pulse train analysis

a new method is proposed based on statistic change point detection.Considering the discrete scan pattern of phased array antenna

the extraction of basic waveforms is converted into the detection of pulse amplitude change points.The circular binary segmentation algorithm which is used for biological chromosome analysis is introduced to split the pulse train into regions of equal amplitude

each of which corresponds to a certain basic waveform.The proposed method needs no prior knowledge

and can give a high performance even when the noise level is comparable with the change level of amplitude.Simulation results show that the method is applicable and effective.