Simulation test method of frequency characteristics of all-digital closed-loop fiber optic gyro system

Abstract

The simulation testing method of the frequency characteristic of full-digital closed-loop fiber optic gyro system: it comprises the following steps (1) the signal processing system that is made up of FPGA chip and EPROM chip produces digital signal inside full-digital closed-loop fiber optic gyroscope system, comprises digital step signal, digital Pulse signals and digital sinusoidal signals of different frequencies; use the FPGA signal processing system to superimpose the digital signals generated in step (1) on the feedback channel of the all-digital closed-loop fiber optic gyro system; (3) use the DSP signal detection system to quickly collect the above-mentioned The input and output of the all-digital closed-loop fiber optic gyroscope system under digital signal input; (4) use the system identification principle to perform least squares processing on the test data of the full-digital closed-loop fiber optic gyroscope system collected above to obtain the frequency of the all-digital closed-loop fiber optic gyroscope system characteristic. The invention eliminates test equipment errors and human errors in engineering applications, has advantages in precision, reliability, debugging manufacturability and the like, and reduces costs.

Description

technical field [0001] The invention relates to a simulation test method for obtaining the frequency characteristics of an all-digital closed-loop fiber optic gyro system. Background technique [0002] At present, the theory and practice of the frequency characteristics of the all-digital closed-loop fiber optic gyro system are not deep enough and not systematic enough, and are still in the debugging stage based on engineering experience, especially the frequency characteristics of the all-digital closed-loop fiber optic gyroscope system that have not yet formed a system Test Methods. The general method to obtain the frequency characteristics of the all-digital closed-loop fiber optic gyro system in engineering is to use laser interferometer to generate interference, indirectly apply sinusoidal signals to the all-digital closed-loop fiber optic gyroscope system through the angular vibration table, and pick up the frequency of the all-digital closed-loop fiber optic gyroscope...

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Problems solved by technology

[0003] The main problem of adopting the above-mentioned angular vibration table scheme is that there are test equipment errors and human operation errors, so that the frequency characteristics of the all-digital closed-loop fiber optic gyroscope system cannot be accurately obtained, mainly in the following aspects:

[0004] (1) There is a problem of leveling the angular vibrating table itself. In actual operation, the level of the angular vibrating table cannot be adjusted by the machine to reach an absolute level, which will affect the gyro response effect;

[0005] (2) The input sinusoidal signal of angular vibration is applied by the signal generator, and there is an operation error when the amplitude and frequency of the input signal are artificially adjusted;

Operational errors occur when interferometric alignment is artificially performed

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