无陀螺捷联惯导系统捷联方案研究

提出了无陀螺捷联惯导系统的惯性测量单元沿单轴相对载体旋转的捷联方案，对该方案进行了理论分析和数值仿真。结果表明，合理安装９ 个加速度计并适当选取捷联矩阵，则捷联方案无需高精度测量惯性测量单元相对载体旋转角速度也能大大提高载体角速度的精度。为满足相同的导航精度要求，本方案可降低对加速度计精度的要求约１０００ 倍。

RESEARCH ON STRAPDOWN SCHEME OF NONGYROSCOPIC STRAPDOWN INERTIAL NAVIGATION SYSTEM

A new strapdown scheme is put forward for the Nongyroscopic Strapdown Inertial Navigation System (NGSINS), which is to make its Inertial Measurement Unit(IMU) rotate around an axis fixed in the vehicle body. With the proper configuration of nine accelerometers and an appropriate definition of Strapdown Matrix, this scheme can obtain high accuracy of angular velocity with no need for high precision sensors to measure the angular velocity of the IMU. The theoretical analysis and digital simulation show that to obtain the same accuracy of navigation, this scheme only needs much lower precision accelerometers, about one thousand times, than the traditional scheme of the NGSINS.