Acceleration, vibration and shock effects-IEEE standards Project P1193

Vig, J.R.; Audoin, C.; Cutler, L.S.; Driscoll, M.M.; EerNisse, E.P.; Filler, R.L.; Garvey, R. Michael; Riley, William J.; Smythe, R.C.; Weglein, R.D.

doi:10.1109/freq.1992.269960

Cited by 20 publications

(6 citation statements)

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“…Resonator deformations that affect its center frequency depend on designs of mounting, elastic properties of materials, acoustic resonances, sound and vibration isolation, orientation, etc. Therefore, suppression of only "dc or time-independent" acceleration sensitivity due to what is commonly called 2 gtipover (Vig et al, 1992) or steady acceleration has limitations and is insufficient to solve the larger problem of "ac or time dependent" acceleration sensitivity due to vibration. Acceleration sensitivity and vibration sensitivity are often used interchangeably for timedependent accelerations.…”

Section: Defining Acceleration Sensitivitymentioning

confidence: 99%

“…Typical aircraft random vibration profile Section 5 is primarily focused on studying the effect of vibration on the phase noise of electronic and opto-electronic oscillators at 10 GHz and also comparing their acceleration sensitivity. The acceleration sensitivity of a quartz oscillator is not discussed here because enormous amounts of work have already been done and the data are readily available in the literature (Vig, 1992;Driscoll, 1993;Filler, 1983;Kosinski, 2000). A good quartz oscillator typically has an acceleration sensitivity of 1 × 10 -9 /g, and the lowest known acceleration sensitivity for a quartz oscillator is 2 × 10 -11 /g for 10 Hz ≤ f v ≤ 200 Hz (Bloch et al, 2006).…”

Section: Environmentmentioning

confidence: 99%

“…However, these oscillators are sensitive to acceleration that can be in the form of steady acceleration, vibration, shock, or acoustic pickup. In most applications the acceleration experienced by an oscillator is in the form of vibration, which can introduce mechanical deformations that deteriorate the oscillator's otherwise low PM noise (Filler, 1988;Vig et al, 1992;Howe et al, 2005). This degrades the performance of the entire electronic system that depends on this oscillator's low phase noise.…”

Section: Introductionmentioning

confidence: 99%

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Vibration-Induced PM Noise in Oscillators and Its Suppression

Hati¹,

Nelson²,

Howe³

2009

Aerial Vehicles

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Section: Defining Acceleration Sensitivitymentioning

confidence: 99%

Section: Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vibration-Induced PM Noise in Oscillators and Its Suppression

Hati¹,

Nelson²,

Howe³

2009

Aerial Vehicles

View full text Add to dashboard Cite

“…Due to these external influences, there is a shift in the nominal frequency of the oscillator or an increased phase noise. As explained by Filler (1988) and Vig et al (1992), the frequency shift depends upon the acceleration sensitivity of the oscillator. Assuming the sensitivity of a 10 MHz oscillator is 1 × 10 -9 per one gravitational acceleration unit g amounting to approximately 9.8 m/s 2 , and with typical root-meansquare accelerations of different aircrafts being in the range of 0.02-5 g, the frequency shift would be about 0.2-50 mHz, respectively.…”

Section: Introductionmentioning

confidence: 96%

Performance of miniaturized atomic clocks in static laboratory and dynamic flight environments

et al. 2020

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Miniaturized atomic clocks with high frequency stability as local oscillators in global navigation satellite system (GNSS) receivers promise to improve real-time kinematic applications. For a number of years, such oscillators are being investigated regarding their overall technical applicability, i.e., transportability, and performance in dynamic environments. The short-term frequency stability of these clocks is usually specified by the manufacturer, being valid for stationary applications. Since the performance of most oscillators is likely degraded in dynamic conditions, various oscillators are tested to find the limits of receiver clock modeling in dynamic cases and consequently derive adequate stochastic models to be used in navigation. We present the performance of three different oscillators (Microsemi MAC SA.35m, Spectratime LCR-900 and Stanford Research Systems SC10) for static and dynamic applications. For the static case, all three oscillators are characterized in terms of their frequency stability at Physikalisch-Technische Bundesanstalt, Germany's national metrology institute. The resulting Allan deviations agree well with the manufacturer's data. Furthermore, a flight experiment was conducted in order to evaluate the performance of the oscillators under dynamic conditions. Here, each oscillator is replacing the internal oscillator of a geodetic-grade GNSS receiver and the stability of the receiver clock biases is determined. The time and frequency offsets of the oscillators are characterized with regard to the flight dynamics recorded by a navigation-grade inertial measurement unit. The results of the experiment show that the frequency stability of each oscillator is degraded by about at least one order of magnitude compared to the static case. Also, the two quartz oscillators show a significant g-sensitivity resulting in frequency shifts of − 1.2 × 10−9 and + 1.5 × 10−9, respectively, while the rubidium clocks are less sensitive, thus enabling receiver clock modeling and strengthening of the navigation performance even in high dynamics.

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“…The measurement technique typically uses a 3-axis accelerometer mounted on or near the oscillator's resonator or other vibration-sensitive components. The spectrum of the mechanical vibration along each axis determines the acceleration level and this is measured against L(f), the resulting PM noise of the oscillating signal while the device is vibrated [5,6]. Noteworthy to this discussion, the spurious sidebands generated by oscillators under vibration is a more serious issue as the signal frequency increases.…”

Section: Introductionmentioning

confidence: 99%