Sinusoidal noise injection into the dither of a ring laser gyroscope
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United States of America Patent
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May 16, 1995
Grant Date -
N/A
app pub date -
Apr 25, 1994
filing date -
Apr 25, 1994
priority date (Note) -
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Abstract
Method and apparatus for reducing the effects of lock-in in a ring laser gyroscope. A sinusoidal noise signal is generated having a peak amplitude which shifts as a function of a dither drive monitor signal to new, random, peak amplitude levels. In the preferred embodiment, the peak amplitude level changes at each zero crossing of the dither drive monitor signal. Each new peak amplitude level is determined as a function of a value provided by a passband filtered random or pseudo random noise source. A step noise signal representative of that passband filtered value is multiplied by the dither drive monitor signal and the resulting sinusoidal noise signal is summed into the dither drive monitor signal. The resulting signal is then used to introduce a frequency bias, electrically or mechanically in at least one of the RLG light beams.
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