中文摘要：

基于加速度计的无陀螺寻北方法是无陀螺惯性导航必须解决的关键问题。目前加速度计的分辨率无法直接敏感地球自转北向分量，文中设计了一种基于定轴旋转的自主式寻北模型。通过将地球自转北向分量加载在载体旋转角速度上，实现加速度计间接敏感地球自转北向分量，从而进行寻北的功能。该模型可以实现载体任意状态下的寻北功能，并精确解算载体姿态。分析了影响寻北精度和姿态解算精度的几个主要因素．仿真结果表明：加速度计的分辨率和信号采集精度是决定模型寻北精度和和姿态解算精度的关键要素。当加速度计分辨率为5×10^-6g，信号采集精度为9mV时，其寻北和姿态解算精度可以达到0.20°。

英文摘要：

Accelerometers-based north-seeking plays a key role in realizing the gyro-free inertial navigation. Since the present accelerometers＇ resolution can not directly detect the north component of earth rotation. This paper presents a north self-seeking model with platform rotating around a fixed axis. By loading the north component to the angular velocity of vehicle rotation, we realize the indirect detecting of the north component of earth rotation, and then the model is capable of north seeking in any conditions, as well as accurately resolve platform attitudes. The factors that influence the accuracy of north seeking and attitude determination were discussed. The simulation results show that the resolution of accelerometers and the accuracy of signal sampling are the key factors that influence the accuracy of north seeking and attitude resolving. If the accelerometers resolution is 5x10^-6g, and the accuracy of signal sampling is 9 mV, then the accuracy of north seeks and attitude determination is better than 0.20°.