title: Novel Gyroscopic Mounting for Crystal Oscillators to Increase Short and Medium Term Stability under Highly Dynamic Conditions.
abstract: In this paper, a gyroscopic mounting method for crystal oscillators to reduce the impact of dynamic loads on their output stability has been proposed. In order to prove the efficiency of this mounting approach, each dynamic load-induced instability has been analyzed in detail. A statistical study has been performed on the elevation angle of the g-sensitivity vector of Stress Compensated-cut (SC-cut) crystals. The analysis results show that the proposed gyroscopic mounting method gives good performance for host vehicle attitude changes. A phase noise improvement of 27 dB maximum and 5.7 dB on average can be achieved in the case of steady state loads, while under sinusoidal vibration conditions, the maximum and average phase noise improvement are as high as 24 dB and 7.5 dB respectively. With this gyroscopic mounting method, random vibration-induced phase noise instability is reduced 30 dB maximum and 8.7 dB on average. Good effects are apparent for crystal g-sensitivity vectors with low elevation angle φ and azimuthal angle β. under highly dynamic conditions, indicating the probability that crystal oscillator instability will be significantly reduced by using the proposed mounting approach.
authors.affiliation: School of Electronics and Information Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China. abedi_maryam@buaa.edu.cn.
authors.forename: Maryam
authors.initials: M
authors.lastname: Abedi
authors.affiliation: School of Electronics and Information Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China. jintian@buaa.edu.cn.
authors.forename: Tian
authors.initials: T
authors.lastname: Jin
authors.affiliation: School of Computer and Information, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China. kewen.sun@hfut.edu.cn.
authors.forename: Kewen
authors.initials: K
authors.lastname: Sun
keywords: crystal oscillator; g-sensitivity; gyroscopic mounting; high dynamic; random vibration; sinusoidal vibrations; stability