Dead zone overcoming system and method of closed-loop fiber-optic gyroscope
A technology of fiber optic gyroscope and dead zone, applied in the field of dead zone overcoming system, to achieve the effect of overcoming the dead zone problem, high reliability and simple operation
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[0035] The present invention will be further explained and illustrated below in conjunction with the accompanying drawings.
[0036] The crosstalk of the closed-loop fiber optic gyroscope mainly comes from the in-phase coupling of the modulated square wave signal generated by the signal processing circuit to the photodetector. The present invention proposes a system and method for overcoming the dead zone of the fiber optic gyroscope. When the gyroscope enters the dead zone, Since the system DAC register switches between two square wave modulation states, two square wave pulses with different amplitudes can be counted in the DAC register of the FPGA digital logic circuit at this time to determine the offset error of the measurement. Then feed back the determined crosstalk error signal to the modulation voltage for error compensation, eliminate the influence of signal crosstalk, make the gyro work in a complete closed loop, and correct the problem that the rate register is zero ...
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