基于导航姿态解算的光纤陀螺平台低频角振动测试方法研究CSCD

为准确评价光纤陀螺平台的低频角振动特性,提出了一种基于导航姿态解算的光纤陀螺平台低频角振动测试方法。首先,通过角振动台精确模拟载体的低频角振动状态,并通过光纤陀螺平台飞行导航过程中的断调平差分信号,实现平台框架角度信号与角振动台激励角度信号的数据同步;然后,利用平台式惯导系统的导航姿态解算方法,实时解算低频角振动过程中光纤陀螺平台的台体姿态,并通过坐标系转换得到平台基座系相对于地理系的实时姿态;最后,通过对光纤陀螺平台稳定回路的幅相特性分析,得到低频角振动激励下稳定回路的幅值和相位特性,实现对光纤陀螺平台角动态特性的准确评估。

The Research about Low-Frequency Angular Vibration Test Method Based on Navigation Attitude Algorithm of Fiber Optic Gyroscope Platform

In order to accurately evaluate the low-frequency angular vibration performance of fiber optic gyroscope platform, a test method for low-frequency angular vibration based on navigation attitude algorithm of fiber optic gyroscope platform is proposed in this paper. Firstly, the angular vibration of the carrier is simulated accurately by the angular vibration table, and time synchronization can be implemented between the frame angle signals of platform and the excitation signals of angular vibration table via the differential signal in the process of flight navigation of fiber optic gyroscope platform. Secondly, the attitude of fiber optic gyroscope platform in the course of low-frequency angular vibration is calculated in real time by means of the navigation attitude algorithm, and the real-time attitude of the platform base coordinate system relative to the geographic coordinate system can be obtained by coordinate transformation. Finally, amplitude and phase characteristics of the stable loop under the low-frequency angular vibration stimulation can be obtained via amplitude-phase characteristic analysis on the stable loop of fiber optic gyroscope platform, which can realize the accurate evaluation on the angular dynamic characteristic of fiber optic gyroscope platform.