捷联惯导空中粗对准方法

针对飞机进近着陆对捷联惯导系统空中重新对准功能的需求,提出一种基于四元数的解析粗对准方法,该方法对飞行动态和飞行平稳性没有要求.推导了利用GNSS测量的速度信息和惯导系统的输出信息对载体姿态进行解算的方法,对精度的影响因素进行了分析.仿真结果表明,该方法可在较宽的动态范围内保持较高的对准精度,计算量较小,速度较快,满足空中粗对准对速度和精度的要求.

Study on coarse alignment method of airborne SINS

An analytical method of coarse alignment in flight based on quaternion which can be used in landing system was presented without any restrictive condition of dynamic process and flight stability.The formula of the coarse alignment which can solve the attitude of the airplane with the velocity measured by GNSS and specific force measured by inertial measurement unit were derived.The factors affecting the alignment performance were analyzed.The simulation results show that the method can be carried out in wide dynamic range with high accuracy,high speed and low computer complexity and can satisfy the requirement of speed and.precision of flight coarse alignment.