Dead zone overcoming system and method of closed-loop fiber-optic gyroscope

Abstract

The invention discloses a dead zone overcoming system and method of a closed-loop fiber-optic gyroscope, and belongs to the technical field of fiber-optic gyroscopes. The closed-loop fiber-optic gyroscope comprises a wide-spectrum light source, a coupler, a Y waveguide integrated optical chip, an optical fiber sensing ring, a photoelectric detector and a signal processing circuit, wherein the signal processing circuit comprises a forward amplification circuit, an A/D module, an FPGA digital logic circuit, a D/A module and a driving circuit. When the gyroscope enters a dead zone, due to the fact that a DAC register of the system is switched between two square wave modulation states, two kinds of square wave pulses with different amplitudes can be counted in the DAC register to determine a measured bias error. The determined crosstalk error signal is fed back to the modulation voltage for error compensation, the influence caused by signal crosstalk is eliminated, the gyroscope works in a complete closed loop, and the problem that the rate register is zero at the moment is corrected, so that the numerical value in the rate register is equal to the real input, and the dead zone problem is solved.

Description

technical field [0001] The invention relates to a system and a method for overcoming a dead zone of a closed-loop fiber optic gyroscope, belonging to the technical field of fiber optic gyroscopes. Background technique [0002] The fiber optic gyroscope is an angular velocity measuring instrument based on the sagnac effect, and is an important component in the field of inertial navigation technology. At present, the digital closed-loop detection scheme is widely used. The structure of the closed-loop fiber optic gyroscope is as follows: figure 1 As shown, it consists of 1 wide-spectrum light source, 2 couplers, 3Y waveguide integrated optical chips, 4 optical fiber rings, 5 photodetectors, 7A / D modules, 9D / A modules, 6 forward amplifier circuits, 10 drive circuits, 8FPGA digital Logic circuit composition. [0003] In the fully digital closed-loop fiber optic gyroscope, the light emitted by the broadband light source 1 is divided into two by the coupler 2, and one beam of li...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the above problems, to provide a closed-loop fiber optic gyroscope dead zone overcoming system and its method, which can effectively solve the problem of zero output at low speeds caused by electronic crosstalk signals in fiber optic gyroscopes

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