System and method for overcoming dead zone of a closed-loop fiber optic gyroscope

Abstract

The invention discloses 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. Closed-loop fiber optic gyroscope includes broadband light source, coupler, Y waveguide integrated optical chip, fiber optic sensing ring, photodetector, signal processing circuit, signal processing circuit includes: forward amplifier circuit, A / D module, FPGA digital logic circuit , D / A module, drive circuit. When the gyro 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 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 at this time, so that the value in the rate register equal to the real input, thereby overcoming the dead zone problem.

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...

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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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