Abstract：Aiming at shortcomings of existing chaotic detection methods, a new method based on chaotic synchronization system was proposed to measure frequency values of weak signals under strong noise background. With the proposed method, characteristics of Lorenz chaotic system, such as, sensitivity to initial values, immunity of noise and synchronism were used, and the drive-response method was adopted to construct a synchronization detection system to de- noise weak signals. Using the multi-signal classification (MUSIC) algorithm, the synchronization error signal was processed to realize frequency measurement of weak signals. It was shown that this method can effectively solve problems of single Duffing oscillator’s complex parameter setting, long operation state conversion time and difficult state determination; it does not need complex chaotic system array structure to solve frequency values of weak signals to be measured. The simulation and test results showed that the new method can correctly detect frequency values of weak signals, and further improve the existing chaotic detection methods. The results provided a new idea for application of chaotic synchronization systems in practical engineering.
李国正，谭南林，苏树强，张驰. 基于Lorenz混沌同步系统的未知频率微弱信号检测[J]. 振动与冲击, 2019, 38(5): 155-161.
LI Guozheng, TAN Nanlin, SU Shuqiang, ZHANG Chi. Unknown frequency weak signal detection based on Lorenz chaotic synchronization system. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(5): 155-161.
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