On the Identification of Systems and the Unscrambling of Data--I: Hidden Periodicities.
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A general problem in science and control engineering is that of identifying a system on the basis of observations. This series of studies will show how to view this as a nonlinear multipoint boundary-value problem that can be resolved numerically using the method of quasilinearization. The memorandum hunts for hidden periodicities in data and provides an alternative to the classical periodogram analysis. 10 pp. (See also RM-4266, RM-4332.)
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