A time delay difference estimation method for unknown frequency of underwater acoustic signals

作者：Zheng En Ming; Chen Xin Hua; Sun Chang Yu

来源：Journal of Vibration and Shock, 2014, 33(9): 190-194.

DOI：10.13465/j.cnki.jvs.2014.09.035

• Cross correlation methods
• Cross correlations
• Estimation methods
• Frequency domains
• Information processing technology
• Line spectra
• Target frequencies
• Underwater acoustic signal

Aiming at the problem of time delay difference(TDD) estimation of unknown frequency, a time delay difference estimation method with time delay difference variance weighted is presented. Firstly, the received signals are processed using Fast Fourier Transform(FFT). Then, the cross-correlation of every frequency unit is conducted by using a pilot signal in frequency domain. The final TDD is obtained by calculating statistically the TDD initial values of all frequency units, when the macimum value of cross-correlation spectrum of noise frequency unit is random and the maximum values of cross-correlation spectrum of target frequency unit nearly consistent. The theoretical analysis and experimental results showed that the proposed method is valid and the signal-to-noise ratio tolerance of the method is much better than that of the cross-correlation method in frequency domain. A reference idea was provided for the time delay difference estimation of weak line spectrum target.

• 出版日期2014
• 单位中国科学院大学