Method for quickly starting optical fiber gyroscope

Abstract

The invention discloses a method for quickly starting an optical fiber gyroscope. The method comprises the following steps: detecting a transient value Delat D2Pi generated by output power of a detector at 2Pi resetting moment under the modulation of square wave, and then compensating a 2Pi voltage value twice by multiplying the transient value Delat D2Pi by a secondary closed loop compensation gain coefficient K, wherein a time threshold T start is set, and the relation expressed by the following formula which is as shown in the specification is generated between the secondary closed loop compensation gain coefficient K and the time threshold T start; the absolute value of secondary K1 is greater than that of secondary K2; the secondary K1 and the secondary K2 are constants; t is working time of the optical fiber gyroscope; the electrifying moment of the optical fiber gyroscope is used as a zero point. The method can be used for effectively shortening the start time by quickly compensating the deviation of 2Pi voltage.

Description

technical field [0001] The invention belongs to the technical field of inertial navigation, and relates to a method for quickly starting a gyroscope, in particular to a method for quickly starting a fiber optic gyroscope. Background technique [0002] Fiber optic gyroscope is a sensor device sensitive to angular velocity. It has the characteristics of high reliability, long life, short start-up time, and large dynamic range. The higher, especially the higher requirements for its startup time. For the fiber optic gyroscope itself, due to the devices used, it often takes a certain warm-up time to make the zero bias reach a stable state. However, the application fields of fiber optic gyroscopes all require fast response capabilities, so shortening the start-up time of fiber optic gyroscopes has become an important problem that needs to be solved in engineering. [0003] There are many factors that affect the stability of the zero bias of the fiber optic gyroscope, and with th...

AI Technical Summary

Problems solved by technology

The closed-loop fiber optic gyroscope demodulation algorithm usually includes a closed loop for generating gyroscope output and a second closed loop for compensating and correcting the 2π reset voltage. The second closed loop is used to compensate and correct the 2π voltage, but the square wave modulation technology usually used , at small speeds, the secondary closed-loop compensation is relatively slow, and it takes a long time to correct the 2π voltage value. During this time, the zero bias of the gyro will change, causing changes in the stability of the zero bias, the so-called Especially at high and low temperatures, the actual 2π voltage value of the phase modulator deviates more from the nominal 2π voltage value, and the compensation time will be longer, which seriously affects the zero-bias stability of the gyro, which is different from the preset The profile of the thermal time is consistent with

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