寻北仪在军事和民用等领域发挥着重要的作用，为了短时间内提供载体航向信息，设计了一种动态捷联式寻北仪。系统主要由一个单轴光纤陀螺、一个石英加速度计和一个旋转平台组成。在静基座条件下，使旋转平台绕垂直轴恒速单向旋转，通过对陀螺和加速度计输出数据的动态特性进行分析，设计了基于正交检测技术的快速寻北方案，能有效抑制惯性元件的漂移噪声，并且旋转平台可以免去复杂的调整水平过程。仿真结果表明，寻北仪转速设置为3(°)/s，在120 s 内给出载体航向信息，精度优于30″，同时也能输出一定精度的水平姿态信息。%North seeker plays an important role in military and civilian fields. With the purpose of providing heading information rapidly, a dynamic strapdown north seeker system was designed, which consists of a single axis fiber optic gyroscope, a quartz-accelerometer and a rotating platform. Based on static base, the rotating platform was made to rotate at the constant rate and in the same direction about the vertical axis. According to the data’s dynamic characteristics of gyroscope and accelerometer, the rapid north seeker scheme based on the orthogonal detection technology was designed. This scheme can effectively suppress the drift noise of the inertial components and free the rotating platform from complex leveling process. Simulation results show that the north seeker, when with 3(°)/s angular rate, can give the heading information in 120 s with the accuracy being superior to 30″, and it can also provide the level attitude information.
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