Spectral Analysis via Lag-Reshaping of the Correlation Estimate; Programs and Simulation Results
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
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The fundamental performance of the generalized spectral analysis technique employing quadratic frequency-smoothing of Fourier-transformed, overlapped, weighted data segments was thoroughly investigated analytically and reported. Possibility pointed out there was that of doing lag-reshaping of the first-stage correlation estimate, and thereby realizing effective spectral window with low sidelobes and good decay rates, without the need for overlap or any temporal weighting at all. However, no programs or simulation results. This situation is rectified by presenting programs for achieving maximally stable low-sidelobe spectral estimates via the lag-reshaping procedure and then employ these routines to exhibit some simulation results for data with tones and noise. In this report, attention is to the case of abutting rectangular temporal weightings with no overlap this procedure, with appropriate lag-reshaping. Keywords Effective window FFT processing Lag-reshaping Lag weighting Minimum execution time Minimum variance.
- Computer Programming and Software