一种基于惯导/地磁信息融合的低成本组合导航方法

A Low Cost Integrated Navigation Method Based on Inertial and Geomagnetic Information Fusion

为提高飞行器在轨导航精度需要高精度惯性导航器件,由此带来成本增加。针对短时间在轨小型飞行器,提出一种基于低成本惯导/地磁敏感器件的信息融合组合导航方法,通过利用微机电系统(Micro-Electro-Mechanical System,MEMS)惯性组合和磁强计输出参数共同构建状态方程和量测方程,并采用基于反馈校正的卡尔曼滤波算法,分析了高、中、低精度的惯导组合和MEMS三轴磁强计不同测量精度条件下的导航精度偏差。结果表明,采用惯导/地磁信息融合导航,可降低对惯性器件的精度要求,从而降低轨道飞行器导航的经济、质量成本和对安装空间的需求。

High precision inertial navigation devices are required for high accuracy of on-orbit navigation of the aircraft,on the other side,it will lead to the increasement of the cost.An integrated navigation method is presented based on inertial and geomagnetic information fusion.This method constructs the state and the measurement equation of inertial combination and MEMS triaxial magnetometer,also uses Kalman filter algorithm based on feedback calibration.The navigation accuracy deviations are analyzed by inertial navigation in high,medium and low precision,together with the MEMS triaxial magnetometer under different accuracy of measurement.The result shows that inertial and geomagnetic information fusion navigation will decrease the accuracy requirements for inertial devices,leading to reducing the cost of the aircraft in the economic and quality and the need for installation space.