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Engineering implementation method for quick starting inertial measurement unit of optical fiber gyroscope and guaranteeing precision

A fiber-optic gyroscope and fast-start technology, applied in Sagnac effect gyroscopes and other directions, can solve the problems of large output noise of fiber-optic gyroscopes, limit the application of fiber-optic gyroscopes, and difficult to achieve fast start-up, and reduce zero temperature drift and Noise, alleviating the contradiction between accuracy and cost, and the effect of reducing accuracy requirements

Active Publication Date: 2005-10-26
BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
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AI Technical Summary

Problems solved by technology

[0002] The traditional electromechanical inertial measurement unit (hereinafter referred to as IMU) needs more than ten seconds of synchronization time after the motor is powered on, and temperature control is also required to ensure accuracy, and it is difficult to achieve fast startup
The fiber optic gyro IMU can be started instantaneously in the temperature range of -40°C to 65°C, but there is a large drift in the zero bias and the noise is also large. There are no reports on relevant testing and compensation methods in foreign literature, which limits The application of fiber optic gyroscope
At the same time, compared with the electromechanical gyroscope, the output noise of the fiber optic gyroscope is larger

Method used

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  • Engineering implementation method for quick starting inertial measurement unit of optical fiber gyroscope and guaranteeing precision
  • Engineering implementation method for quick starting inertial measurement unit of optical fiber gyroscope and guaranteeing precision
  • Engineering implementation method for quick starting inertial measurement unit of optical fiber gyroscope and guaranteeing precision

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Embodiment Construction

[0020] Such as figure 1 As shown, the calibration test equipment of the present invention is composed of a high-precision temperature control device TD-500 and a single-axis precision rotary table 3TS-320B. Perform temperature control. Because the turntable is installed on the vibration-isolation base, the working vibration of the temperature control equipment and the movement of personnel will not affect the IMU, ensuring the reliability of the test data.

[0021] The IMU is installed on the mounting surface of the turntable, and the input axis of the tested angular rate is horizontal. The rotary table works in the rate mode, which can calibrate the rate of the gyroscope. In the position mode, the rotary table is set to work as a digital grating dividing head, and the linearity test of the accelerometer within the range of ±1g is performed. Calibrate the IMU at the set temperature point to obtain the zero bias of the instrument.

[0022] Using the above-mentioned temperatu...

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Abstract

The invention is the project realizing method of fiber top inertia measuring device fast starting and precision guarantee, which adopts the temperature demarcating system to detect the temperature mode; found the module of the affirming parts of the fiber top and the quartz accelerator and effectively reduce the zero-bias brought by the temperature; implement small-wave transforming procession to the fiber top noises and make the stability of the zero-bias be better than 0.5 Deg. / h and the zero-bias error be smaller than 10 to power 4 g. The invention effectively reduces the zero temperature floating and noises and improves the performance of the system.

Description

technical field [0001] The invention relates to an engineering realization method for fast start-up and precision assurance of an optical fiber gyroscope inertial measurement device. Background technique [0002] The traditional electromechanical inertial measurement unit (hereinafter referred to as IMU) needs more than ten seconds of synchronization time after the motor is powered on, and temperature control is required to ensure accuracy, so it is difficult to achieve fast startup. The fiber optic gyroscope IMU can be started instantaneously in the temperature range of -40°C to 65°C, but there is a large drift in the zero bias and the noise is also large. There are no reports on relevant testing and compensation methods in foreign literature, which limits application of fiber optic gyroscopes. At the same time, compared with the electromechanical gyroscope, the output noise of the fiber optic gyroscope is larger. The random walk coefficient RWC is a technical index that ...

Claims

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Application Information

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IPC IPC(8): G01C19/72
Inventor 王巍张志鑫王颂邦杨清生朱红生秦伟亮韩英杰
Owner BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
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