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.
Highlights
Nowadays oscillators are widely used in huge number of electronic communication, measurement and testing devices
Crystal oscillators are exposed to a variety of dynamic loads, their short and medium-term stability is degraded during missions [4,5,10]
Reduction of oscillator instability is a function of an unknown parameter, which is the direction of its g-sensitivity vector
Summary
Nowadays oscillators are widely used in huge number of electronic communication, measurement and testing devices. The analysis and simulations show that the proposed mounting can provide up to 30 dB improvement in phase noise that is equal to the best reduction possible with the costly and complicated accelerometer feedback method [28]. This mounting is able to suppress the attitude change of host vehicle-induced instability. In order to reduce or ideally suppress the drawbacks of the gyroscopic mounting method which could occur in the case of any dynamic load, it is proposed to use a combined method of employing the aforementioned mounting with an active vibration noise control approach using accelerometer feedback [16,26,27,28].
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