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Novel Gyroscopic Mounting for Crystal Oscillators to Increase Short and Medium Term Stability under Highly Dynamic Conditions.

Abedi M, Jin T, Sun K - Sensors (Basel) (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: School of Electronics and Information Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China. abedi_maryam@buaa.edu.cn.

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.

No MeSH data available.


Related in: MedlinePlus

Maximum instability (ξ = φ) caused by random vibration for ƒRV = 2000 (Hz). (a) Frequency jitter of fixed oscillator; (b) Frequency jitter of gyroscopic mounting; (c) Phase noise of fixed oscillator; (d) Phase noise of gyroscopic mounting.
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sensors-15-14261-f022: Maximum instability (ξ = φ) caused by random vibration for ƒRV = 2000 (Hz). (a) Frequency jitter of fixed oscillator; (b) Frequency jitter of gyroscopic mounting; (c) Phase noise of fixed oscillator; (d) Phase noise of gyroscopic mounting.

Mentions: If ξ = φ and β = 0, thus and coincide each other, therefore this mounting shows the best positive effects for low elevation angle φ. If ξ – φ = π/2 or β = π/2, then and are perpendicular to each other, in this case gyroscopic mounting shows the worst performance. These results are shown in Figure 22 and Figure 23.


Novel Gyroscopic Mounting for Crystal Oscillators to Increase Short and Medium Term Stability under Highly Dynamic Conditions.

Abedi M, Jin T, Sun K - Sensors (Basel) (2015)

Maximum instability (ξ = φ) caused by random vibration for ƒRV = 2000 (Hz). (a) Frequency jitter of fixed oscillator; (b) Frequency jitter of gyroscopic mounting; (c) Phase noise of fixed oscillator; (d) Phase noise of gyroscopic mounting.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507649&req=5

sensors-15-14261-f022: Maximum instability (ξ = φ) caused by random vibration for ƒRV = 2000 (Hz). (a) Frequency jitter of fixed oscillator; (b) Frequency jitter of gyroscopic mounting; (c) Phase noise of fixed oscillator; (d) Phase noise of gyroscopic mounting.
Mentions: If ξ = φ and β = 0, thus and coincide each other, therefore this mounting shows the best positive effects for low elevation angle φ. If ξ – φ = π/2 or β = π/2, then and are perpendicular to each other, in this case gyroscopic mounting shows the worst performance. These results are shown in Figure 22 and Figure 23.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: School of Electronics and Information Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China. abedi_maryam@buaa.edu.cn.

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.

No MeSH data available.


Related in: MedlinePlus