Recognition of Intra-pulse Modulation based on Phase Difference
Aiming at the common radar signal,a fast recognition algorithm of intra-pulse modulation with low SNR is proposed.Firstly,the signal is filtered by FFT,and the instantaneous frequency is calculated by phase difference.Then,characters are extracted by peak detection,least squares linear estimation and second order phase difference.Finally,the combined parameters are used to realize rapid recognition.The method of positive and negative frequency labeling is given,which is differentiated in the ambiguity resolution stage.Based on the analysis of phase error sources,the dual-threshold phase unwrapping method is proposed by using the principle of hysteresis comparator,which can effectively suppress the phase mutation caused by noise.Simulation results show that the recognition rate can reach 90%when SNR is above-4dB.
phase difference phase unwrapping peaks detection intra-pulse modulation recognition
Linzhou Li Xiaolei Fan Zengping Chen
College of Electronic Science and Engineering,National University of Defense Technology Changsha,China
国际会议
重庆
英文
421-425
2017-03-25（万方平台首次上网日期，不代表论文的发表时间）