一种MHD角振动传感器动态本底噪声无偏高效测试方法  

An unbiased and efficient measurement method for dynamic noise floor testing of MHD angular vibration sensors

作　　者：李醒飞[1] 刘帆 LI Xingfei;LIU Fan(State key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《中国惯性技术学报》2024年第6期620-629,共10页Journal of Chinese Inertial Technology

基　　金：深海技术科学太湖实验室“揭榜挂帅”项目(2022JBGS03001)。

摘　　要：目前,磁流体动力学(MHD)角振动传感器动态本底噪声测试尚无统一方法,难以有效开展测试。首先,针对双通道和三通道方法系统误差不明确的问题,推导了两种方法的系统误差,指出了方法的适用条件;然后,针对双通道方法存在系统误差、三通道方法系统结构复杂的问题,提出了一种基于最小二乘的传感器动态本底噪声无偏高效测试方法,证明了所提方法不存在系统误差;最后,实验对比了三种方法的测试效果。结果表明,所提方法能够在时域和频域上准确分离传感器的动态本底噪声;相比双通道和三通道方法,所提方法的平均相对误差最小,分别为7.2%和3.7%;测试系统所需资源少、结构简单而且易于实现,满足MHD角振动传感器动态本底噪声的测试需求。Currently,there is no unified method for testing the dynamic noise floor of magneto-hydro-dynamic(MHD)angular vibration sensors,which makes it difficult to conduct effective testing.Firstly,to address the issue of unclear systematic errors in the two-channel and three-channel methods,the systematic errors of these two methods are derived,and the application conditions are pointed out.Then,aiming at the issues of systematic errors in the two-channel method and the complex system structure in the three-channel method,a unbiased and efficient dynamic noise floor measurement method based on least squares is proposed,and it is proved that the proposed method has no systematic error.Finally,the effects of the three methods are compared through experiments.The experimental results show that the proposed method can accurately separate the dynamic noise floor in both the time and frequency domains.Compared to the two-channel and three-channel methods,the proposed method has the smallest average relative errors,which are 7.2%and 3.7%,respectively.The proposed method requires fewer resources,has simple structure and is easy to implement,which meets the need for testing the dynamic noise floor of MHD angular vibration sensors.

关 键 词：微角振动 角速度传感器 本底噪声 最小二乘 

分 类 号：V241.59[航空宇航科学与技术—飞行器设计]