单轴旋转捷联惯导系统重力扰动补偿方法研究

随着惯性器件精度的提升以及系统级补偿技术的应用,惯性导航系统精度得到不断提升。原先忽略的一些误差源如重力扰动,成为制约惯导精度进一步提升的关键。针对该问题,研究了单轴旋转捷联惯导系统重力扰动补偿,补偿所需重力扰动信息通过德国波尔茨坦GFZ研制的EIGEN-6C4计算得到。仿真结果表明,经重力扰动补偿后,单轴旋转捷联惯导系统精度有显著提升。

Gravity Disturbance Compensation for Single-axis Rotary-Modulation Strapdown Inertial Navigation System

In recent years, the precision of inertial navigation system (INS) has been much improved due to the precision improvement of inertial sensors and development of system-level compensation methods. Some error sources, which have been ignored previously, have become the critical issues that restrict the further improvement of INS. The gravity disturbance is just within this category. With this consideration, this paper is devoted to investigating the gravity disturbance compensation for single-axis rotary-modulation strapdown INS. The required gravity disturbance is derived by the high-degree spherical harmonic model EIGEN-6C4 provided by GFZ. The numerical results show that the performance of strapdown INS has been improved to a certain extent after the gravity disturbance compensation.