Research on Anti-Interference Transmission of Cascaded Low-Frequency Trigger Signal
During the operation of cascaded low-frequency trigger,it is affected by the interference signal bandwidth and different interference sources,which leads to poor synchronization signal transmission.For this reason,the anti-interference transmission method of cascaded low-frequency trigger signal is proposed.Firstly,the cascaded low-frequency trigger synchronization control signal is separated by transforming observation matrix,and the signal order is determined by using the Euclidean distance measure of signal similarity.Next,the center frequency of the interfering signals is detected and the corresponding bandwidth in each interfering signal as well as the location of the interfering source are estimated by an adaptive spectrum estimator.Then,the instantaneous frequencies are processed using the Wigner Ville distribution(WVD)method to calculate the optimal weights for maximizing the signal-to-noise ratio.Finally,the cascaded low-frequency trigger synchronization control signal anti-interference transmission is realized by suppressing the interference,multiplying the compensation coefficients,and rejecting the interference through the adaptive time-varying filtering method.The experimental results show that the proposed method has better noise interference filtering effect.The signal frequency after control is stable between[-1,+1].The detection rate of cascaded low-frequency trigger synchronization control signals is higher than 95%.The correct detection rate of signals with different signal-to-noise ratios is above 90%.The packet loss rate of signals transmitted with different reading distances is lower than 7%.The proposed method has better anti-interference transmission performance of synchronization control signal with less interference.
Cascade low-frequency triggerSynchronous control signalAnti-interference transmissionSignal separationEuropean distanceSpectrum estimatorSignal-to-noise ratio
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