A Closed-loop Fiber Optic Gyroscope Temperature Compensation Method
A fiber optic gyroscope and temperature compensation technology, applied in the fields of inertial navigation and fiber optic sensing, can solve the problems of large temperature signal noise, low temperature resolution, large space required, etc., and achieves high reliability, simple implementation method and low cost. Effect
Active Publication Date: 2020-04-28
XIAN FLIGHT SELF CONTROL INST OF AVIC
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[0005] The purpose of the present invention is: in order to overcome the problems of complex circuit, low temperature resolution, large temperature signal noise, high cost and large space required in the existing optical fiber gyroscope temperature compensation technology, the present invention utilizes the necessary integration of the closed-loop optical fiber gyroscope itself The optical modulator (referred to as Y waveguide) has a linear correlation characteristic between half-wave voltage and temperature, and proposes a method for closed-loop fiber optic gyro temperature compensation using Y-wave half-wave voltage information instead of temperature information
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[0089] 1) Press figure 1 For the structure shown, choose a closed-loop fiber optic gyroscope with a ring length of 1200 meters and a room temperature accuracy of 0.007° / h for the pre-compensation variable temperature and zero offset test (temperature range -40°C to +60°C, temperature change rate 1°C / min). The output before gyro compensation is as Figure 7 As shown, the solid line is the zero offset data, and the dashed line is the Y-waveguide half-wave voltage code value data;
[0090] 2) Determine the gyro compensation model coefficient b by the least square method according to the zero offset and half-wave voltage data output by the gyro 0 , K 1 , K 2 Value, calculated b 0 =8.4752, k 1 =0.0043, k 2 =0.2046, the established compensation model is:
[0091] B(v)=8.4752+0.0043v+0.2046v′
[0092] Compensate the gyro according to the compensation model, and the compensation result is as follows Figure 8 Shown by the dotted line;
[0093] 3) Compensate the gyro according to the establish...
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The invention belongs to the technical fields of optical fiber sensing and inertial navigation, and relates to a closed loop fiber-optical gyroscope temperature compensating method. The closed loop fiber-optical gyroscope temperature compensating method is characterized in that a Y waveguide half-wave voltage substitutes temperature information to carry out temperature compensation on a closed loop fiber-optical gyroscope by using the approximate linear relationship between the Y waveguide half-wave voltage change and the temperature change of the closed loop fiber-optical gyroscope, and a four state modulation-based double-loop closed loop fiber-optical gyroscope is used to extract the change information of the waveguide half-wave voltage with the temperature in real time in order to realize the temperature sensor-free closed loop fiber-optical gyroscope temperature compensation. The method simplifies the design of software and hardware of a circuit, further reduces the size of the gyroscope, increases the compensation precision, has the characteristics of simple realization method, low cost and high reliability, and is of great significance to increase the temperature change precision of the fiber-optical gyroscope and further expand the application field of the fiber-optical gyroscope.
Description
Technical field [0001] The invention belongs to the technical field of optical fiber sensing and inertial navigation, and relates to a closed-loop optical fiber gyroscope temperature compensation method, in particular to a closed-loop optical fiber gyroscope temperature compensation method without a temperature sensor. Background technique [0002] Fiber Optic Gyroscope (FOG) is an all-solid-state inertial instrument that uses the optical Sagnac effect (Sagnac) to measure the angular velocity of the carrier space. With the continuous expansion of fiber optic gyroscope technology and its application fields, the accuracy requirements for fiber optic gyroscopes under variable temperature environments continue to increase. [0003] At present, the deterioration of the accuracy of the fiber optic gyroscope in a variable temperature environment has always been one of the important factors affecting the further improvement of the fiber optic gyroscope's performance and the expansion of th...
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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 谷林梁霄李彬
Owner XIAN FLIGHT SELF CONTROL INST OF AVIC
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