加速度计I/F变换电路数字补偿方法  

Digital compensation for I/F converter of accelerometer

作　　者：黄丽娟 邵志浩 郑永强 李丽 

机构地区：[1]湖北航天技术研究院总体设计所,武汉430040

出　　处：《中国惯性技术学报》2014年第4期547-551,共5页Journal of Chinese Inertial Technology

基　　金：国防863项目(2006AA702106)

摘　　要：石英挠性加速度计的输出I/F变换电路存在分辨率与线性度互为矛盾的现象,也是目前困扰国内惯导产品精度提升的普遍问题。文中通过对现有I/F变换电路的电路原理、影响输出分辨率和线性度的主要原因、电路中元器件的参数特性等进行了详细分析,提出了一种全新的数字补偿算法,可以在不改变现有硬件的基础上,用软件实现线性度的算法补偿,并给出了完整的数字补偿计算公式和各参数的获取方法。经过惯导产品的试验验证,该算法可以使I/F变换电路的线性度提高一个数量级。I/F变换电路数字补偿算法不仅有效解决了电路分辨率与线性度互为矛盾的问题,且易于实现,同时还可以大大简化生产中繁琐的硬件调试过程,具有较高的工程应用价值。The resolution and linearity of quartz flexible accelerometer’s I/F converter are contradictory. Nowadays, this problem prevents the improvement of I/F converter of inertial measurement unit(IMU). By analyzing the existing I/F converter, including the circuitry, the main reasons that affect the output resolution and linearity, and the parameter characteristics of electronic components, a new digital compensation method is put forward. It applies software to realize the linearity’s compensation without changing any hardware, and the compensation formula and parameter calculation are given. The experiments show that the linearity of I/F converter circuit can be improved by an order of magnitude. This method resolves the contradictory of resolution and linearity, simplifies the process of hardware debug, and is easy to implement.

关 键 词：惯导系统 石英挠性加速度计 I/F变换 线性度 数字补偿 

分 类 号：TJ765.4[兵器科学与技术—武器系统与运用工程]