4-72
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
Text Box: L (f) (dBc)
L (f) (dBc)
1K
2K
300
5
45 dB
Text Box: L(f) without vibration
L(f) without vibration
Text Box: L(f) under the random vibration shown
L(f) under the random vibration shown
5
300
1K
2K
Text Box: PSD (g2/Hz)
PSD (g2/Hz)
.04
.07
Text Box: Frequency (Hz)
Frequency (Hz)
Typical aircraft
random vibration
envelope
Phase noise under vibration is for G = 1 x 10-9 per g and f = 10 MHz  
Random-Vibration-Induced Phase Noise
   Shown above is a typical aircraft random vibration specification (power spectral density vs. vibration frequency is shown in the upper right portion of the figure) and the resulting vibration-induced phase noise degradation.  The degradation of 45 dB can produce severe system performance degradation.


R. L. Filler, "The Acceleration Sensitivity of Quartz Crystal Oscillators:  A Review," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 35, No. 3, pp. 297-305, May 1988.