Abstract
Synchronous detection is the key of the demodulation for Two Way Automatic Communication System (TWACS), and needs to determine the existence of voltage distortion in the power noise. The reliable synchronization detection can not be achieved by traditional means of TWACS due to the strong interference in the industrial network. For this reason, the pseudo-random M sequence encoding is applied in this paper for the modulation of the synchronization information. The synthetic signals are generated according to the modulation code, and then the syndrome parameters are calculated by Short-window Fourier transform and cross-correlation technique. The quality of the synchronous detection in the poor industrial channel can be ensured by the sharp autocorrelation of the M sequence and the syndrome parameters.
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