Editing Allan variance (section)

==Uses==
Allan variance is used as a measure of frequency stability in a variety of precision oscillators, such as [[crystal oscillator]]s, [[atomic clock]]s and frequency-stabilized [[laser]]s over a period of a second or more. Short-term stability (under a second) is typically expressed as [[phase noise]]. The Allan variance is also used to characterize the bias stability of [[gyroscopes]], including [[fiber optic gyroscope]]s, [[hemispherical resonator gyroscope]]s and [[Microelectromechanical systems|MEMS]] gyroscopes and accelerometers.<ref>[http://www.afahc.ro/ro/afases/2014/mecanica/marinov_petrov_allan.pdf Allan variance analysis on error characters of low-cost MEMS accelerometer. MMA8451Q] afahc.ro 2014</ref><ref>{{Cite book|last1=Bose|first1=S.|last2=Gupta|first2=A. K.|last3=Handel|first3=P.|title=2017 International Conference on Indoor Positioning and Indoor Navigation (IPIN) |chapter=On the noise and power performance of a shoe-mounted multi-IMU inertial positioning system |date=September 2017|pages=1–8|doi=10.1109/IPIN.2017.8115944|isbn=978-1-5090-6299-7|s2cid=19055090}}</ref>