A method for autonomous verification of fiber optic gyroscope detection circuit

Abstract

The invention discloses an autonomic verification method for a fiber-optic gyroscope detection circuit. The method comprises the following steps that: firstly, constructing a fiber-optic gyroscope detection circuit, determining the intrinsic frequency of the fiber-optic gyroscope and the external crystal oscillation frequency of the fiber-optic gyroscope detection circuit, and manufacturing an AD(Analog-to-Digital) convertor and a DA convertor to collect a clock signal; then, carrying out testing and calculation to obtain the time delay of a pre-amplification circuit and the AD convertor, anddetecting all time delays t2 of the detection circuit; and finally, manufacturing a modulation square wave control signal, a demodulation square wave control signal, a demodulation process positive half cycle sampling signal and a demodulation process negative half cycle sampling signal so as to carry out analysis to obtain whether the functions of the pre-amplification circuit and the AD convertor circuit are normal or not, detecting the noise of the pre-amplification circuit and the AD convertor circuit, detecting whether the functions of all circuits are normal or not, and detecting the noise of all circuits.

Description

technical field [0001] The invention relates to the technical field of optical fiber gyroscope angular rate measurement, in particular to an autonomous verification method for an optical fiber gyroscope detection circuit. Background technique [0002] Fiber optic gyro, as a new type of inertial attitude sensor with all solid-state, small size, large dynamics, and mechanical resistance, is being used more and more widely. At present, the detection circuit of fiber optic gyroscope is generally realized by full digital closed-loop detection. . [0003] A typical closed-loop detection circuit of a fiber optic gyroscope generally includes a pre-amplifier circuit, an AD converter, a signal processor, a DA converter, and a post-amplifier. The signal processor is used to complete the analog-to-digital conversion. The signal processor is the core part, which is used to complete the modulation, demodulation and closed-loop control based on the digital signal. The DA converter is used...

AI Technical Summary

Problems solved by technology

[0008] Method (1) relies on the cooperation of the optical fiber loop, which leads to the inability to effectively decouple the verification of the circuit part from the optical circuit part, thus affecting product development

And in the case of problems in the product development process, it is impossible to quickly decouple the positioning problem, thus further affecting the product development process;

[0009] Method (2) lacks targeted tests for hardware, such as the design and analysis of performance index test schemes that have a greater impact on modulation and demodulation, such as delay links;

[0010] Method (2) lacks targeted verification for each module of the hardware, resulting in the final verification result for the entire circuit, unable to find key modules that affect product performance, which may lead to "performance problems, it is difficult to locate each module" or " Performance improvement, unable to find key factors", lack of practical application value

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