中文摘要：

针对电子罗盘在甚小口径终端（Very Small Aperture Terminal,VSAT）应用中出现的航向和姿态测量精度问题进行了研究.讨论了电子罗盘航向和姿态测量的基本原理,推导了姿态测量误差和航向测量误差的数学模型,分析了滚转角和航向角测量误差随俯仰角增大而增大的原因,提出了一种提高航向和姿态测量精度的新方法.仿真和实测结果表明：新方法能基本消除俯仰角对滚转角测量精度的影响,同时能有效提高航向角测量精度.在转台俯仰角30°情况下,采用新方法修正后的滚转角精度约为0.2°,航向角精度约为0.5°.

英文摘要：

This paper studied the measurement precision of the electronic compass used in VSAT（very small aperture terminal）, The basic principle of the measurement was discussed in detail, and the error mathematical model of the measurement was derived. The cause for the increase of the roll angle measurement error with the increases of the pitch angle was analyzed and a novel method for improving the measurement precision was proposed based on the above analysis. The simulation and experiment results show that the novel method can remove the influence of pitch angle on the roll angle measurement and can im- prove the accuracy of heading measurement effectively. The application of the novel method shows that the roll angle accuracy is approximately 0.2v and the heading angle accuracy is approximately 0.5°with a turntable pitch angle of 30 °.