Abstract
The relative performance of the current methods for frequency and phase measurements is analyzed in this paper. These methods include the time domain processors (namely the counter and the covariance processors) and the frequency domain processor using the Fourier transform (for the actual signal or for its correlation function). It can be shown that the Fourier transform method gives the optimum frequency and phase estimation in terms of the Maximum Likelihood criteria (ML). The quantization effect is also analyzed and it is shown that 1 bit quantization provides sufficient accuracy for laser Doppler velocimeter applications and, in general, for any application where a single tone parameter estimation is of interest.
Finally, a practical implementation of a frequency domain Doppler signal processor will be described. The processor implementation is based on 1-bit sampling, quadrature mixing, and several innovative methods for signal to noise optimization. The advantages of using 1-bit over multibit sampling for processing speed improvement and data storage reduction will be discussed.
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© 1991 Springer-Verlag Berlin, Heidelberg
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Ibrahim, K.M., Werthimer, G.D., Bachalo, W.D. (1991). Signal Processing Considerations for Laser Doppler and Phase Doppler Applications. In: Adrian, R.J., Durão, D.F.G., Durst, F., Maeda, M., Whitelaw, J. (eds) Applications of Laser Techniques to Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-61254-1_15
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DOI: https://doi.org/10.1007/978-3-642-61254-1_15
Publisher Name: Springer, Berlin, Heidelberg
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