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Published online by Cambridge University Press: 21 April 2022
As mentioned earlier, time series data must include time stamps. It may seem trivial, but some attentions are needed to properly use time to avoid mistakes. The objective of this chapter is to review a few concepts of time so that when an analysis of time series data is performed, there is less chance to make mistakes with respect to data consistency, the result of analysis, and interpretation. We will discuss some basic astronomical concepts related to time; different definitions of day; and time measurements, GMT, and UTC. We will learn using MATLAB to construct a time sequence from civil time or time strings, i.e. the year, month, day, hour, minute, and second to a real number of time and vice versa. We will also briefly discuss the Positioning, Navigation, and Timing (PNT) data from the Global Positioning System (GPS).
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