北京航空航天大学学报 ›› 2016, Vol. 42 ›› Issue (9): 1836-1842.doi: 10.13700/j.bh.1001-5965.2015.0544

• 论文 • 上一篇    下一篇

光纤陀螺惯性测量单元数据频混误差仿真分析

潘雄, 黄玉琼, 张少博, 王夏霄, 宋凝芳   

  1. 北京航空航天大学 仪器科学与光电工程学院, 北京 100083
  • 收稿日期:2015-08-24 出版日期:2016-09-20 发布日期:2016-02-18
  • 通讯作者: 潘雄,Tel.:010-82316547-898,E-mail:08768@buaa.edu.cn E-mail:08768@buaa.edu.cn
  • 作者简介:潘雄,男,博士,讲师,硕士生导师。主要研究方向:光纤陀螺技术。Tel.:010-82316547-898,E-mail:08768@buaa.edu.cn;黄玉琼女,硕士研究生。主要研究方向:多采样率信号处理。Tel.:010-82316547-819,E-mail:15029913792@163.com;张少博,男,博士研究生。主要研究方向:光纤传感器信号处理及系统集成。Tel.:010-82316547-819,E-mail:zhangshaobo@buaa.edu.cn;王夏霄男,博士,高级工程师,硕士生导师。主要研究方向:光纤陀螺与光纤传感技术。Tel.:010-82316547-811,E-mail:wangxiaxiao@buaa.edu.cn;宋凝芳女,博士,教授,博士生导师。主要研究方向:光纤传感技术、空间光电技术。Tel.:010-82338814,E-mail:snf@263.net

Simulation and analysis of data frequency mixing errors in IMU based on FOG

PAN Xiong, HUANG Yuqiong, ZHANG Shaobo, WANG Xiaxiao, SONG Ningfang   

  1. School of Instrumentation Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2015-08-24 Online:2016-09-20 Published:2016-02-18

摘要: 导航计算机对光纤陀螺(FOG)测量数据的异步重采样将引起数据的频谱混叠误差。基于FOG信号检测特点,以FOG闭环输出数据更新率、惯性测量单元(IMU)异步通信定时脉冲频率为参量,以载体的正弦干扰频率为变量,以导航计算机接收信号直流(DC)分量的幅值误差抑制为目标,建立了仿真模型。分析了现有内插抽取方案和滑动滤波方案的数据频混误差及延时特性。提出了类盲发变滑窗长度方案,抑制了频混误差响应谱对滑窗长度的敏感性。仿真结果表明,相比滑窗长度偏离最优值4%的滑动滤波方案,变滑窗长度方案的误差最大值从0.056 85降至0.009 737,能更好地适应定时脉冲信号频率抖动或切换的工程应用需求。

关键词: 光纤陀螺(FOG), 导航, 异步通信, 多抽样率, 数字滤波

Abstract: The asynchronous resampling of fiber optic gyroscope (FOG) output data by navigation computer can cause frequency mixing errors. Based on the characteristics of FOG signal detection, a simulation model was established using the update rate of FOG closed-loop output and the resampling frequency of inertial measurement unit (IMU) as parameters, the sinusoidal noise frequency of vehicle as a variable, and the decrease of signal direct current (DC) amplitude error received by navigation computer as the target. The frequency mixing errors and delay characteristics of interpolation and decimation scheme and sliding filter scheme were analyzed. A variable sliding window length scheme was proposed and the sensitivity of error response spectrum to sliding window length was suppressed. The simulation results show that the maximum error of the variable sliding window length scheme is reduced from 0.056 85 to 0.009 737 compared with the sliding filter scheme with sliding window length's deviation from the optimal value of 4%. Besides, the proposed scheme can better accommodate the engineering requirement of timing pulse frequency dithering or switch.

Key words: fiber optic gyroscope (FOG), navigation, asynchronous communication, multirate sampling rate, digital filter

中图分类号: 


版权所有 © 《北京航空航天大学学报》编辑部
通讯地址:北京市海淀区学院路37号 北京航空航天大学学报编辑部 邮编:100191 E-mail:jbuaa@buaa.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发