Abstract
Ring laser gyro (RLG) can work in mechanically dithered mode or rate-biased mode according to the working state of the inertial navigation system (INS). It can change from one mode to the other by receiving outer instructions. To evaluate the performance of RLG in rate-biased mode, an inertial measurement unit (IMU) based on RLG is installed on a dual-axis turntable, the turntable offers a constant angular velocity to the RLGs, in that way RLG can work in the rate-biased mode. A calibration method is proposed to calibrate the scale factor error, misalignments and constant bias of RLG in rate-biased mode, experiment results show that the differences of scale factor of the three gyros in two modes are 9 ppm, 7 ppm and 3.5 ppm, the constant biases of the three RLGs in rate-biased mode are also different from that in mechanically dithered mode with the difference of 0.017°/h, 0.011°/h and 0.020°/h, the input axis misalignment angle of RLGs in different modes also changed. What is more, a calculation method of angle random walk (ARW) of RLG in rate-biased mode is also presented. Experimental results show that the ARW of the RLG in rate-biased mode is about one third of that in mechanically dithered.
Highlights
Ring laser gyroscope is a kind of inertial rotation sensor with the advantages of wide dynamic range, high reliability and high precision [1], which make RLG the ideal sensor for inertial navigation system (INS)
More stable, when the rotation velocity is more than 30◦ /s, the difference of the scale factors of RLG in s, the deviation
Based on the experiment results, as the rotation angular velocity increases, the scale factor becomes more stable, when the rotation velocity is more than 30◦ /s, the difference of the scale factors of RLG in two modes is around 3 ppm, and 30◦ /s is chosen in this paper to calibrate the errors and the calculate the angle random walk (ARW) of the RLG in rate-biased mode
Summary
Ring laser gyroscope is a kind of inertial rotation sensor with the advantages of wide dynamic range, high reliability and high precision [1], which make RLG the ideal sensor for INS. Average ARW coefficient, so the method proposed in reference [8] has a few drawbacks What is this method cannot be used in evaluating the performance of a single RLG in rate-biased mode. When the data series of gyro is acquired, the main frequencies of Fourier analysis is an effective method to analyze the periodic components in a signal. In this the periodic rotation error in everyWhen revolution areseries obtained byisapplying analysis.
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