Precision frequency division method for three-axis optical fiber gyroscope

Abstract

The invention relates to a precision frequency division method for a three-axis optical fiber gyroscope. The precision frequency division method is characterized in that the frequency division methodcomprises the following steps of 1) external clock reference and two-stage DCM design; 2) two-stage DCM scheme timing processing; 3) precise frequency division improvement; and 4) calculation of a frequency division parameter algorithm. According to the method, the design is scientific and reasonable, the purpose of precise frequency division of loop components with different lengths is achieved on the basis that the gyroscope modulation and demodulation hardware circuit is not changed, so that the gyroscope performance is improved, and the full-temperature zero-bias repeatability of the three-axis gyroscope can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, relates to precise frequency division of a three-axis fiber optic gyroscope, and in particular to a method for precise frequency division of a three-axis fiber optic gyroscope. Background technique [0002] In the development and production process of the three-axis gyroscope, the unavoidable problem is that there are differences in the eigenfrequency of the three ring components of the same gyroscope. This difference mainly comes from two aspects: [0003] 1) One is that during the ring winding process, due to insufficient winding precision, there will be errors in the number of turns of optical fibers in different layers, or winding errors caused by different fiber diameters. These errors are reflected in the geometric length difference of the ring components ; [0004] 2) The second is the difference caused by the difference in the equivalent refractive index. Even if the geome...

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Problems solved by technology

[0003] 1) First, in the loop winding process, due to insufficient winding precision, there will be errors in the number of turns of optical fibers in different layers, or winding errors caused by different fiber diameters. These errors are reflected in the geometric length difference of the loop components ;

[0004] 2) The second is the difference caused by the difference in the equivalent refractive index. Even if the geometric lengths of the optical fibers of the three ring components are the same, the difference in the equivalent refractive index will also cause differences in the intrinsic frequency

For the three ring components with different eigenfrequencies, it is difficult to require the least common multiple of the three different modulation frequencies to meet the requirements of the DCM module (and the maximum frequency multiplication factor is 32), so this solution does not meet the engineering application conditions

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