Phased-locked loop laser gyroscope system

Details Phased-locked loop laser gyroscope system Phased-locked loop laser gyroscope system

H - Electricity

01

S

345/10

H01S 3/082 (2006.01) G01C 19/66 (2006.01)

Patent

CA 1136249

PHASE-LOCKED LOOP LASER GYROSCOPE SYSTEM Abstract A very high resolution laser gyroscope system having a phased-locked loop operatively coupled to one or more frequency difference outputs from a laser gyroscope cavity. Waves of at least four frequencies propagate around the gyroscope cavity, with output signals being formed having a frequency equal to the difference between the frequencies of wave pairs. In one set of embodiments of the invention, the frequency difference signal for one wave pair is phase-locked to an external reference source. A signal applied to a Faraday rotator bias coil provides the frequency shifting of the wave pairs necessary to achieve phase lock. The amplitude of the signal applied to the Faraday bias coil provides a highly precise measure of the rate of rotation. In another set of embodiments of the invention, one or more of the wave pair frequency difference signals are coupled as inputs to an external phase-locked loop in which a voltage controlled oscillator-is followed by a frequency divider of the feedback circuit. In these embodiments, the output of the voltage controlled oscillator provides an output signal which has a frequency in proportion to but many times higher than the frequencies of the wave pair difference signals In still further embodiments of the invention, the two phase- locked loop techniques may be combined. In all of the disclosed systems, the quantization error normally associated with laser gyroscope output signals is substantially reduced.

322871

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