Research on laser coded signal extraction technology based on stochastic resonance

The coded laser signal with low energy for irradiation the target is proposed for countermining laser warning system and laser protection technology. Meanwhile, the stochastic resonance technology is applied to extract and recognize the weak laser encoded signal. The principle of stochastic resonance technique is analyzed, and the process of the extraction of low signal to noise ratio (SNR) of the normal periodic code signal, binary signal and four coded signal are simulated. The results show that, in the case of suitable parameters, the low SNR laser coded signal can be effectively extracted by the stochastic resonance system. Stochastic resonance technique is one of an important method for extracting the signal with low SNR.