Abstract
Due to the asynchronous sampling in practical applications, spectrum leakage and fence effect significantly decrease the precision of fast Fourier transform (FFT)-the common signal processing method for laser Doppler velocimeter (LDV). In order to increase the precision of LDV signal processing, trispectral interpolation of Nuttall window is proposed. Based on the comparison and analysis of sidelobe characteristics, four-term first-order, four-term third-order, four-term minimum sidelobe, three-term minimum sidelobe Nuttall windows were adopted to reduce the spectrum leakage. Trispectral interpolation of these four kinds of window functions were carried out to alleviate the fence effect. Processing results of simulated and measured signals verify the viladity and accuracy of proposed method. For measured signals in laboratory, the minimum relative error of trispectral interpolation is 0.06% (four-term minimum sidelobe Nuttall window). Meanwhile, for simulated signals, the minimum relative error is only 0.0068% (four-term third-order Nuttall window in low frequency range). Overally speaking, four-term third-order and four-term minimum sidelobe Nuttall windows have better accuracy. Owing to its conciseness and efficience, trispectral interpolation of Nuttall window is a practical method for LDV signal processing.
Published Version
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