捷联惯性导航系统重力扰动影响分析

摘要

Through the calculation of the gravity disturbance with the EGM2008 spherical harmonic model the gravity disturbance graph of a certain area wasgenerated . Since the model of strapdown inertial navigation error under the condition of gravity disturbance was established, then the influence of the horizontal component of gravity disturbance on the error of strapdown inertial navigation system can be proved by a simulation. The simulation results show that gravity disturbance can cause the velocity and the position error with the Schuler period oscilation, when there is 12.5 × 10-5ms-2 gravity disturbance, it will cause position error of 160 m.%通过EGM2008地球重力场球谐模型生成某区域重力扰动图,建立重力扰动情况下捷联惯性导航系统误差模型,仿真验证重力扰动的水平分量对捷联惯性导航误差的影响,结果表明:重力扰动的水平分量引起的捷联惯性导航系统的水平位置与速度误差以舒拉周期进行振荡,重力扰动为12.5×10 -5ms-2时,位置误差达160 m.