User:Rrogers314
Appearance
For measurements the interest is in the "drift" of a variable with respect to a measurement at a previous time. This is calculated by applying the signal time differencing:
to
Where is the time between measurements, , and has the units of at 1 hz and includes the contribution of both positive and negative frequency terms.
After some manipulation, the variance of the voltage difference in watts is:
References
[edit]- Milton Abramowitz and Irene A. Stegun, eds. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. New York: Dover, 1972. (See Chapter 5)