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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

Sinusoidal vibrations of the Ariane 5 launch vehicle. Adapted from [7].
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sensors-15-14261-f014: Sinusoidal vibrations of the Ariane 5 launch vehicle. Adapted from [7].

Mentions: Sinusoidal vibrations applied on the payload installed inside the fairing of Ariane 5 are as shown in Figure 14. The magnitude and angular orientation of these vibrations are illustrated in Figure 15 by dividing the frequency into three bands. That is why, in this section, two jumps are seen in the analyses figures corresponding to sinusoidal vibration-induced disturbances. The conic area in Figure 15 points out that this load can be applied on the crystal surface with any angle 0° < β < 360°, and it directly depends on the installation of the oscillator on the host vehicle.


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)

Sinusoidal vibrations of the Ariane 5 launch vehicle. Adapted from [7].
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-14261-f014: Sinusoidal vibrations of the Ariane 5 launch vehicle. Adapted from [7].
Mentions: Sinusoidal vibrations applied on the payload installed inside the fairing of Ariane 5 are as shown in Figure 14. The magnitude and angular orientation of these vibrations are illustrated in Figure 15 by dividing the frequency into three bands. That is why, in this section, two jumps are seen in the analyses figures corresponding to sinusoidal vibration-induced disturbances. The conic area in Figure 15 points out that this load can be applied on the crystal surface with any angle 0° < β < 360°, and it directly depends on the installation of the oscillator on the host vehicle.

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