Wu L.,Harbin Engineering University |
Tian J.,Ministry of Navy Armament |
Cheng J.-H.,Harbin Engineering University
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2011
With the practical application of fiber optic gyroscope, it is found that the carrier vibration would increase the measurement error of FOG, especially high-precision FOG. The carrier vibration also significantly influences the performance indicators of FOG. In this paper, the impact mechanism of vibration to all-digital closed-loop interferometric fiber optic gyroscope is analyzed based on the elastic-optic effect, and the non-reciprocal phase shift error signal forms between opposite spread optical signals in the fiber coil under the influence of vibration are obtained. It is proposed that noise and drift in FOG output signal could be suppressed through reasonably install the fiber coil. Experiment results show that the proposed method can effectively reduce the FOG output signal noise and suppress the vibration of the FOG drift. The FOG vibration error decreased one order of magnitude.
Cheng J.-H.,Harbin Engineering University |
Chen D.-D.,Harbin Engineering University |
Tian J.,Ministry of Navy Armament
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2013
In view of the high requirement for the vehicle linear movement characteristic in the conventional transfer alignment accuracy evaluation for shipborne weapon SINS, a new approach of accuracy evaluation based on classified factors adaptive filter is proposed by augmenting the "velocity+position+attitude" match. This approach uses the velocities and position of the differential GPS as main reference information, and uses the attitudes of the main SINS as adjective reference information to compose the multi-observation variables. A classified factors adaptive filter was designed to improve the used-ratio of SINS information. A fixed interval Kalman smoothing algorithm was used to realize the accurate evaluation of transfer alignment. Computer simulation results show that the new method can realize fast and accurate attitude evaluation only by the ship's sway, and exhibits excellent adaptability to time-dependence measure noises of attitudes. This approach is an effective method for transfer alignment accuracy evaluation, and the estimation error is less than 10%.