Time series analysis of analog data by analog-to-digital and digital data processing methods at the Naval Postgraduate School.
Jones, Robert Drake
Boston, Noël E.J.
Thornton, Edward B.
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Time series data consisting of temperature and velocity fluctuations recorded two to four meters above a tidal mud flat were processed to produce power spectra. The analog data were first processed through an Analog-to-Digital computer consisting of a Hybrid Computer System (XDS 9300/Ci 5000). The resulting tapes, in octal representation, were converted to hexadecimal representation for further processing on a 768k byte storage digital computer (IBM 360/67). A series of three digital programs were used to compute and plot Fourier coefficients in spectral form. Digital data processing procedure using magnetic tape on the two computer systems is explained in detail and specific examples of programs and control card decks are given. Significant noise levels were encountered in the Hybrid Computer System (ADC) which must be eliminated in future studies.
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