内水平阻尼捷联惯导误差仿真研究

Error Research and Simulation of the Inner-level-damping Strapdown Inertial Navigation System

捷联惯导系统依靠算法建立导航坐标系,以数学平台取代平台惯导物理实体平台,其系统误差中同样存在三种周期振荡成分。将平台惯导内水平阻尼思想引入捷联惯导,阻尼舒拉周期振荡和傅科周期振荡误差成分,同时推导了内水平阻尼捷联惯导误差传播方程。仿真实验表明,引入内水平阻尼之后,在载体加速度较小的条件下,捷联惯导姿态精度得到明显提高。

The Strapdown Inertial Navigation System（SINS）establish navigation frame of reference using the computer arithmetic and replace the physical platform by mathematic platform.There are three types cycle oscillations in its errors.Introducing the idea of platform inner-level-damping into the SINS to obstruct Schuler and Foucault cycle oscillations.Meanwhile the transmitting form of the inner-level-damping system error is established.The result of the simulation show that when the system acceleration is small enough,the attitude precision of the SINS is improved markedly by drawing into the damped algorithm.