大气辅助惯导空中对准研究

The Study of In-flight Alignment for INS Based on Air Data

INS/GPS在进行空中对准时通常需要机体作机动以此来增强姿态误差角的可观性,由于GPS信号在机动条件下误差较大且与惯导信息的同步性不好,对准效果很差。针对以上问题,文中提出了利用大气数据系统输出的真空速辅助惯性基准系统进行三组合空中对准的方法,与传统的对准方法相比,飞机无需机动飞行,只需要匀速直线运动便可以完成空中对准,大大提高对准精度并且缩短对准时间。通过仿真,验证了以上方法的有效性。

INS/GPS requires the aircraft to maneuver for better observation of the attitude errors in in-fight alignment.However,the effect of the alignment is very bad because error of GPS signal is greater and synchronization is bad when aircraft maneuvers.A method of in-flight alignment by using true air speed aid inertial reference system output by air data system was presented.Compared with the traditional alignment,aircraft needn＇t maneuver,the in-flight alignment can be realized by the aircraft＇s uniform straight motion,thereby the alignment precision is improved and the time is reduced.Simulation proves the validity of the method above.