Closed-loop control method for fiber-optic gyroscope

Abstract

The invention discloses a closed-loop control method for a fiber-optic gyroscope. The closed-loop control method comprises the following steps of 1, enabling a signal to enter AD; 2, sampling being carried out in two sampling periods P and S, and sampling values being obtained; performing consistency check on the sampling values, and removing abrupt change points to obtain phase errors; 3, carrying out integration processing on the phase error to generate sawtooth waves; 4, sawtooth waves being provided for DA; 5, superposing the square wave modulation signal into DA to form a step wave; and 6, the DA converting the step wave signal into a current / voltage signal and applying the current / voltage signal to the integrated optical modulator, and closed-loop control over the gyroscope being achieved. In the second step, a method for carrying out consistency check and abrupt change point removal processing on the collected signals comprises the following steps of respectively carrying out noise suppression processing on sampling values in two adjacent sampling periods P and S to respectively obtain sums; and then calculating the phase error according to a formula. The method is advantaged in that the noise suppression effect can be effectively improved.

Description

technical field [0001] The invention relates to a control method for an optical fiber gyroscope, in particular to a closed-loop control method for an optical fiber gyroscope. Background technique [0002] Fiber optic gyroscope, as an all-solid-state fiber optic gyroscope, has been widely used in various fields such as military and civilian. The basic working principle of the fiber optic gyroscope is based on the Sagnac effect, that is, in a closed circular optical path, the light emitted by the light source is divided into two by the coupler, and the two beams of light propagate in the clockwise and counterclockwise directions respectively, and return to the coupling device position. When the circular light path rotates clockwise (or counterclockwise) with respect to the inertial reference frame, the light waves propagating clockwise and counterclockwise experience different optical paths. By measuring the optical path difference, the relative Angular velocity of rotation ...

AI Technical Summary

Problems solved by technology

[0009] However, in the traditional processing method, the default analog-to-digital converter is error-free; but in the actual system, due to the influence of the modulation signal (generating comb-like spikes), even if suppression measures such as de-spike are used, the analog-to-digital converter Occasional bit errors still occur

Due to the characteristics of the closed-loop fiber optic gyro (the steady-state error is zero), occasional bit errors will not cause the gyro to open the loop or malfunction, but only increase the gyro noise

However, for higher precision applications, such noise can seriously affect its accuracy

[0010] Therefore, the existing closed-loop control method has the problem of unsatisfactory noise suppression effect

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