Study On Error Mechanism And Identification Of Error Model For The Dynamically Tuned GYRO

Dynamically tuned gyro (DTG)become a new kind of precision gyro, and has been used widely succeeding liquid floated gyro and gas floated gyro . Because of the merits of miniature, low weight, short warm-up time, long span-life, and high reliability, DTG has been widely used in spaceflight, aviation, seafaring and other fields. Its precision is significant for navigation and more and more attention on its accuracy is being paid for. Now people are thinking many of the analyses of DTG's error and the calibration of high-precision error model. By using Navier-Stokes equation, this paper analyzes the motion of the gas and its disturbing moments which are made in the front gap and radial gap, and gives the suggestion for reducing the influence of the disturbing moments on DTG's precision. Then gives the plans to calibrate DTG's high-precision error mode with the three-axis turntable: for three-order static-error model, there are the test plan with D-optimal criteria and the low angular rate test plan; for three-order dynamic-error model, establishes the relationship between the uniform angular velocities of three axes and the harmonic angular velocities and angular accelerations which the formers make, and puts forward the test plans which include the constant ratio and the variable ratio of the uniform angular velocities. With these researches, we can calibrate all the DTG's static errors and dynamic errors accurately by installing instrument only one time. [12]20Finally, these plans are validated by the software, their effects are compared by least square appraisal, D-optimal criteria and some other theories, and the influence of the concerned factors on the identification effect is also discussed.