Digital Signal Processing - Spectral Analysis: Parametric and Non-Parametric Digital Methods - page 64

We clearly see a peak for the frequency 3.63 day -1 , i.e. a period of 27.53 days,
which can be interpreted as the lunar month. We also see a peak for a frequency
which is approximately double, i.e. a period of half a lunar month; in a qualitative
way, the spring tides come when we have the following 2 types of alignments: earth-
moon-sun, or moon-earth-sun, which explains the half lunar month. We will leave it
to the astronomers to interpret this spectral decomposition further.
2.5. Bibliography
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[HAR 78] HARRIS J., “On the use of windows for harmonic analysis with the discrete
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[IDI 01] ID IER J., Ed., Approche bayésienne pour les problèmes inverse, Hermès, 2001.
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[LJU 87] LJUNG L., System Identification: Theory for the User, Prentice Hall, 1987.
[MAR 87] MARPLE JR. S., Digital Spectral Analysis with Applications, Prentice Hall, 1987.
[MAX 96] MAX J., LACOUME J., Méthodes et techniques de traitement du signal et
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[OPP 75] OPPENHEIM A., SCHAEFER R., Digital Signal Processing, Prentice Hall, 1975.