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《Journal of Data Acquisition and Processing》 2011-05
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Intra-Pulse Modulated Signal Recognition in Low Signal-to-Noise Ratio

Zhao Feng,Liu Yu,Yang Jian(College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China)  
Intra-pulse modulated signal recognition is important in electronic warfare(EW).Filtering by a sliding window in the process of orthogonal transformation can remove the out-of-band noise and improve the signal-to-noise ratio(SNR).Then the phase of signals can be obtained by the improved phase unwrapping algorithm,thus automatically recognizing the normal signal,the linear frequency modulation signal and the three-order polynomial phase signal by fitting the curve of instantaneous phase,and estimating the parameters.The simulation results show that the recognition rate is greater than 90% and the precision of parameters estimation is high enough when SNR is not less than 0 dB.
【CateGory Index】: TN957.51
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