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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。
In order to meet the demand of airborne real-time alignment (SINS) system’s air-landing alignment, a quaternion-based analytical coarse alignment method is proposed, which has no requirements on flight dynamics and flight stability. The method of calculating the attitude of the carrier by using the velocity information measured by GNSS and the output of the inertial navigation system is deduced. The influencing factors of the accuracy are analyzed. The simulation results show that this method can maintain high alignment accuracy over a wide dynamic range, with less computational complexity and faster speed, and meets the requirements of speed and accuracy for coarse alignment in air.