采用90型二频机抖激光陀螺和石英挠性加速度计，利用单轴旋转惯性组件的方法，研制了高精度姿态测量系统。介绍了系统的硬件结构组成和无减震结构设计方案，给出了初始对准和姿态测量系统的算法。系统的初始对准采取粗对准和精对准两种方式, 姿态测量系统的误差传播特性由系统的误差模型来描述。对该系统进行了静态导航实验和长时间单轴旋转导航实验。实验结果表明：系统水平姿态24h保持精度优于30″，24h航向保持精度优于30″。

The high precision attitude measurement system is researched, which is made of a model-90 dithered ring laser gyroscope and quartz flexibility accelerometers, and a method to rotate the inertial measurement unit is developed. The hardware of the system is introduced and a mechanical design concept without damper is given. The technique of the alignment and the attitude computation are described. The alignment consists of coarse alignment and precise alignment, and system error propagation characteristics can be described by system error model. The static test and single-axial rotation test are performed. The results show that the precision of the attitude in 24 hours is better than 30 seconds, and the precision of the heading in 24 hours is less than 30 seconds.