A rotating inertial navigation system with the rotating axis error compensation consisting of fiber optic gyros |
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| Authors: | Zha Feng Hu Bai-qing Qin Fang-jun and Luo Yin-bo |
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| Affiliation: | College of Electricity and Information Engineering, Naval University of Engineering, Wuhan 430033, China;College of Electricity and Information Engineering, Naval University of Engineering, Wuhan 430033, China;College of Electricity and Information Engineering, Naval University of Engineering, Wuhan 430033, China;College of Electricity and Information Engineering, Naval University of Engineering, Wuhan 430033, China |
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| Abstract: | An effective and flexible rotation and compensation scheme is designed to improve the accuracy of rotating inertial navigation
system (RINS). The accuracy of single-axial RINS is limited by the errors on the rotating axis. A novel inertial measurement
unit (IMU) scheme with error compensation for the rotating axis of fiber optic gyros (FOG) RINS is presented. In the scheme,
two couples of inertial sensors with similar error characteristics are mounted oppositely on the rotating axes to compensate
the sensors error. Without any change for the rotation cycle, this scheme improves the system’s precision and reliability,
and also offers the redundancy for the system. The results of 36 h navigation simulation prove that the accuracy of the system
is improved notably compared with normal strapdown INS, besides the heading accuracy is increased by 3 times compared with
single-axial RINS, and the position accuracy is improved by 1 order of magnitude. |
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