Design Of Tract Circuit Signal Detection System Based On Stochastic Resonance

With the cocntinuous acceleration of China's high-speed railways,the requirements for controlling the safety of trains are also increasing.ZPW-2000A non-insulated track circuit,as the backbone of China's self-developed fr-equency-shift automatic occlusion system,plays a vital role in ensuring traffic safety and improving railway transportation capacity and efficiency,The track circuit signal is the indication signal of the train,but since the track circuit signal is an electrical signal,it is inevitably disturbed by various strong noises.Therefore,it is extremely important to detect the track circuit signal from a strong noise background.This paper studies the detection of track circuit signals in the background of strong noise.Firstly,the time-domain and fr equency-domain characteristics of the ZPW-2000A frequency-shifted signal and its parameter characteristics are s'ummarized.The an alysis technique of the orbit signal is mainly in the frequency domain and the time domain is supplemented.Secondly,for the problem that the track signal is not effectively recognized by the interference noise during the transmission process,the adaptive tracking circuit signal detection algorithm based on stochastic resonance is proposed.By using the stochastic resonance generated by the combination of signal,noise and nonlinear bistable system,it can exert a strong advantage in strong noise background detection.Thirdly,for the problem that the parameters of nonlinear bistable system are difficult to adjust,this paper adopts the continuous domain adaptive ant colony algorithm based on mesh partitioning strategy,and solves th e parameter adjustment problem of bistable system by using its excellent parallel optimization characteristics.The output signal-to-noise ratio is used as the evaluation function of the closed-loop adaptive system.The ant colony algorithm is used to realize the adaptive adjustment of the system parameters.Finally,the algorithm is verified by MATLAB,then the software and hardware design of the transmissi on and reception of the scheme is completed,and the experimental verification is carried out on the railway siteThe experimental results show that the output signal-to-noise ratio of the output signal is higher than the input signal-to-noise ratio,and the carrier frequency and modulation frequency of the track circuit signal can be accurately identified.The feasibility of the scheme is confirmed again,and the detection of the track circuit signal in the background of strong noise can be realized.