两步非线性最小方差法在微机械陀螺测量火箭弹自旋角中的应用

火箭弹自旋角的测量是火箭弹姿态角测量中的关键。因为火箭弹的自旋角速度较高,所以陀螺杆度因子的微小变化将引起自旋角度很大的测量误差,使测量结果失去意义,为了克服标度因子变化带来的影响,本文首先将标度因子扩展为状态变量,然后利用Haupt提出的两步非线性最小方差估计器将其估计出来,仿真结果表明,当标度因子的漂移小于0.5%时,能对自旋角进行较好的估计。

APPLICATION OF A TWO-STEP LEAST SQUARE METHOD IN THE MEASUREMENT OF SPINNING ANGLE OF ROLLING PROJECTILES WITH MICRO GYROS

Measurement of the spinning angle of a projectile is a key to the measurement of the projectile's attitude Because of the high spinning rate, a small fluctuation in the scale factor of the gyros will cause marked errors in the spinning angle, which invalids the measurement To cope with the influence of the fluctuation, the scale factor to the state equation is adopted and a two step least square estimation method proposed by Gordon T Haupt is used to estimate it Simulation results show that the two step method can estimate the spinning rate satisfactorily if the fluctuation of the scale factor is kept within 0 5%