Abstract
A method of high accuracy time difference measurement for the periodic pulse signal is proposed in this paper. Normally, the time difference between the periodic pulse signals received by two channels is estimated by the phase shift of the harmonic on the cross-spectrum between the received signals. However, the cross-spectrum method would be inaccurate in the low SNR environment. Dealing with this problem, an improved method based on the stochastic resonance (SR) is proposed in this paper. A SR filtering system is established to highlight the periodic pulse in the received signal. Then, an accurate time difference is estimated by the cross-correlation between the SR filtering outputs. The simulation results show that, comparing with the cross-spectrum method, the proposed method decreases the normalized mean square error (NMSE) of the time difference estimation from 0.6 to 0.1 with an input SNR of 5dB.
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