The main parameters of the fiber optic gyroscope include scale factor, scale factor nonlinearity, scale factor repeatability, zero bias, zero bias stability, zero bias repeatability, zero bias temperature sensitivity, random walk coefficient, etc.

1. Scale factor
K refers to the ratio of the gyroscope output value to the input angular rate, and its change directly affects the sensitivity of the gyroscope. The scaling factor K is calculated based on the least squares fit and represents only the slope of a specific straight line, which is an expression of the relationship between input and output data measured over the entire input angular rate range. Mode. Since different detection systems correspond to different input and output methods, it is not easy to obtain a unified scaling factor expression. For interference fiber optic gyroscopes, it is commonly expressed by equation (1).

Among them, represents the phase change value, represents the rotation angular rate, L represents the fiber length, D represents the fiber ring diameter, and represents the light source wavelength. This equation represents the ideal scaling factor.

2.Scale factor nonlinearity
Within the input angular rate variation range, relative to the straight line measured by the least squares method, the maximum deviation value (the degree of deviation from the straight line) of the actual output of the fiber optic gyroscope is higher than the maximum output of the fiber optic gyroscope.

3. Bias stability
Bias stability refers to the output value under zero input state, which can measure the degree of dispersion around its mean value. Under static conditions, zero-drift stability is also defined as the fluctuation or stability of the zero-bias, or the mean square error. It can be represented by the mean value of this output within a specified period of time, which is equivalent to the input angular velocity, also called zero drift or bias drift. It is often used to indicate the accuracy of fiber optic gyroscopes.

4. Bias repeatability
Under certain conditions and within the same interval, the degree of discreteness of the fiber optic gyroscope's zero bias relative to its mean value is determined by repeated energization. This process is highly random and can be calculated using the zero bias measured multiple times. The standard deviation is the zero-bias repeatability.

5. Bias temperature sensitivity
Compared with the zero-bias at normal temperature, affected by temperature, the zero-bias temperature sensitivity refers to the ratio of the zero-bias change of the fiber optic gyroscope to the temperature change, which is usually expressed by their maximum ratio.

6. Random walk coefficient
The random walk coefficient is an important technical indicator that characterizes the size of white noise. It is an error coefficient caused by white noise. This error coefficient is accumulated over time and output through the gyroscope. With the accumulation of time, the angular random error has great uncertainty, so it is also called angular random walk (ARW).

In the fiber optic gyroscope north seeking system, the accuracy of the fiber optic gyroscope determines the final north seeking accuracy of the system to a large extent. Therefore, the above main performance indicators, as the basic performance indicators of the fiber optic gyroscope, play a decisive role in the north seeking accuracy of the north seeking system. , which reflects the accuracy and environmental adaptability of fiber optic gyroscopes.

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