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Preliminary Study on Optical Dithering and Injecting Noise in RLG

Author: HuangLinLin
Tutor: XieYuanPing
School: National University of Defense Science and Technology
Course: Optical Engineering
Keywords: Laser gyro Lock- Backscatter Mechanical jitter Optical Jitter
CLC: V241.5
Type: Master's thesis
Year: 2009
Downloads: 34
Quote: 0
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Abstract


Lock-in effect laser gyro accuracy is an important factor , to reduce the lock area, you need to use a variety of methods to improve the gyroscope integrated backscatter . Optical Jitter is a lens through backscatter modulation to achieve improved gyro lock-in method , optical jitter thesis theoretical studies and experimental verification, to a certain conclusion. First introduced to improve the lock- optical dithering principle . Right stick on the lens in the laser gyro PZT additional optical jitter voltage signal, the lens will be based on the frequency of the signal light shaking amplitude according to certain rules sliding jitter, jitter amplitude when the lenses meet the specific relationship, in theory, can make the gyro back to minimize scattering , so as to achieve the purpose of improving the lock-in . Followed by the establishment of the quadrilateral changes in the optical path of laser gyro model , using the model to obtain a phase change of backscatter sliding the lens quantitative relationship between the amplitude . According to the cavity mirror translation of the amplitude-frequency curve for different frequencies to improve shake optically backscattered signal reaches the ideal optimum voltage value of the sensitivity of the optical cavity mirror shift jitter. Build an experimental platform , the frequency with the same amplitude , the phase difference of π constant two-way sinusoidal voltage signal loading to stick on the top two lenses implemented on a piezoelectric ceramic sliding jitter. Loading optical gyro dither signal lock area after test results show that the optical signal is actually improved lock- shaking trend in the jitter voltage amplitude is not large when basically consistent with the theory . Finally, the mechanical jitter plus noise , mechanical noise and jitter without mechanical jitter without additional optical jitter noise but three cases were compared gyro stability experiments , obtained optical jitter can play a similar mechanical gyro dither adding noise to improve conclusions performance . Additional optical jitter , the laser gyro dynamic lock reduced further validate the conclusions.

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Aircraft instrumentation,aerospace equipment > Gyro instrument
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