船体变形测量中激光陀螺误差的抑制机理  

Error suppression mechanism for ring laser gyro in ship deformation measurement

作　　者：吴伟[1] 秦石乔[1] 杨云涛[1] 王省书[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《中国惯性技术学报》2014年第5期665-670,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金资助项目(11172323;61275002)

摘　　要：针对激光陀螺测量误差对船体自主变形测量精度的影响问题,在角速度匹配方程基础上提出了一种信号同步积分求解变形角的方法。根据船体角运动的周期特性,利用实测船体运动角速度信号产生时序同步信号,并与角速度匹配方程相乘得到新的测量方程,使得包含变形角信息的有用信号通过积分得到增强,而陀螺误差则被调制为随机信号,积分后被抑制,从而提高了测量方程的信噪比。仿真结果表明:当积分时间大于5 min时,变形角测量误差的均方根值(RMS)小于10",且随着积分时间的增加,测量精度将会提高。这种同步积分方法不需要对陀螺误差建模即可实现对船体变形的高精度测量,而且直观地解释了在激光陀螺误差存在条件下自主变形测量误差不随时间发散的原因。A synchronization integral method based on the angular matching function is presented for reducing the influence of the ring laser gyro (RLG) error in ship deformation measurement. Specifically, the method produce the synchronization time series from the ship angular rate signal according to the period characteristics of ship angular motion, and then the time series are multiplied by the angular matching function to get a new measurement function. As a result, the signals with the deformation information are strengthen through integral, while the RLG errors are modulated to random signals and reduced through integral. Therefore, the signal to noise ratio of measurement function is improved through synchronization integral. Simulation results show that the deformation measurement can achieve an accuracy of 10 arcsecs (RMS) within 5 min, and the accuracy can even be improved when with longer integral time. This synchronization method can solve the ship deformation values to reach high accuracy without requiring a priori knowledge of RLG error model. Additionally, it also directly depicts the reason why ship deformation measurement error is not increased with time when RLG errors exist.

关 键 词：船体变形 激光陀螺 零偏误差 随机误差 同步积分法 

分 类 号：U666.1[交通运输工程—船舶及航道工程]