瞬態(tài)信號雙譜估計的一種新方法
A NEW METHOD OF BISPECTRAL ESTIMATION FOR TRANSIENT SIGNAL
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摘要: 瞬態(tài)信號的模型參數(shù)估計在許多領(lǐng)域占據(jù)相當重要的地位。本文利用高階矩的性質(zhì),提出一種Q-slice馬爾可夫ARMA模型雙譜估計算法。仿真結(jié)果表明,該方法估計精度高,計算量小,即使在低信噪比的情況下,對瞬態(tài)信號也有較好的擬合效果.
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關(guān)鍵詞:
- 瞬態(tài)信號; 雙譜估計; Q-slice算法; ARMA模型; 馬爾可夫模型
Abstract: Estimation of model parameter for transient signal is very important in many aspects. This paper presents a new Markov ARMA model Q-slice estimation algorithm of transient signal based on bispectrum. Simulation results show that this new method has some special features, such as higher estimation precision, lower amount of calculation, higher fitting effect even in lower signal-to-noise ratio (SNR) situation. -
[1] Subba Rao T, Gabr M M. An Introduction to Bispectral Analysis and Bilinear Time Series Models. New York: Seringer-Verilag, 1984. [2] Nikias C L, Raghuveer M. Bispectrum estimation: A digital signal processing framework[J].Proc. IEEE.1987, 75(7):869-891 [3] 陸軍,雙譜在沖激雷達信號處理中的應(yīng)用:[碩士論文],長沙:國防科技大學,1996. [4] Giannakis G B, Mendel J M. Cumulant-based order determination of non-Gaussian ARMA model, IEEE Trans. on Acoust, Speech, Signal Proccessing, 1990, ASSP-38(8): 1411-1423. -
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