Vibration error compensation method of fiber optic gyro strap-down inertia measurement system

Abstract

The invention provides a vibration error compensation method of a fiber optic gyro strap-down inertia measurement system. A vibration experiment is conducted on the fiber optic gyro strap-down inertiameasurement system to collect the output data of an inertia measurement element accelerometer and a fiber optic gyro of the fiber optic gyro strap-down inertia measurement system; the installation error of the fiber optic gyro and the accelerometer is considered and is compensated to the output of the gyro and the accelerometer; and power spectral analysis is conducted on the output of the accelerometer after the compensation of installation error to obtain the vibration characteristics of a vibration signal; and an Elman neural network method is used to conduct non-linear compensation to thevibration error output of the fiber optic gyro strap-down inertia measurement system. In the situation of environmental vibration, the method uses a reasonable neural network model to compensate thevibration error and can effectively reduce the effect of the environmental vibration on the precision of the system and maintain favorable precision.

Description

(1) Technical field [0001] The invention relates to an error compensation method for a fiber optic gyroscope strapdown inertial measurement system, in particular to a fiber optic gyroscope strapdown inertial measurement system vibration error compensation method based on an Elman neural network. (2) Background technology [0002] At present, the medium and low-precision fiber optic gyro strapdown inertial measurement system has moved from the laboratory to the practical stage, but the application of the high-precision fiber optic gyro strapdown inertial measurement system is still limited by environmental conditions, especially vibration conditions. Theoretically speaking, compared with the mechanical gyroscope, the characteristics of the all-solid structure and no rotating moving parts of the fiber optic gyroscope determine that it should have the advantages of strong shock resistance, strong anti-vibration ability, and high reliability. However, in practical applications, ...

AI Technical Summary

Problems solved by technology

However, in practical applications, the stress change of the optical fiber ring caused by shock and vibration, the vibration of the device tail fiber, and the resonance of the structure will all cause gyro errors, resulting in an increase in the dynamic error in the vibration state, resulting in an increase in the accuracy of the fiber optic gyro strapdown inertial measurement system. reduction of

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