An orientation spectrum estimation method based on temporal and spatial instantaneous stability

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 281-288.

WANG Linsheng1,2, WANG Huiting3, LIU Zhigang4

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Abstract

Here, aiming at the robustness problem of spatial orientation spectrum estimation method based on subspace decomposition, an orientation spectrum estimation method based on temporal and spatial instantaneous stability was proposed. Firstly, according to the instantaneous stability of space target signal in time domain, the solving process in frequency domain of covariance matrix was converted into its solving process in complex domain by coherent compensation to reduce effects of spatial data stability on covariance matrix estimation. Secondly, according to difference of orientation spectrum peak value index dispersion output by each subspace, the weighting factor of orientation spectrum of each subspace was extracted. Finally, various subspace orientation spectra were weighted with these weighting factors to form the synthetized space orientation spectrum and reduce effects of background noise on the final spectrum. The results of numerical simulation and actual measured data processing showed that compared with the subspace decomposition method, the proposed method can effectively reduce effects of spatial data stability on covariance matrix estimation without loss of spatial resolution; the requirement of the minimum signal-to-noise ratio is reduced by more than 6 dB without target prior information.

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orientation spectrum estimation / covariance matrix / complex domain / peak index dispersion / weighting factor

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WANG Linsheng1,2, WANG Huiting3, LIU Zhigang4. An orientation spectrum estimation method based on temporal and spatial instantaneous stability[J]. Journal of Vibration and Shock, 2021, 40(13): 281-288

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