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针对数字磁罗盘(DMC)罗差校准算法存在环境适应能力差的不足,采用微电子机械系统(MEMS)陀螺仪信号进行辅助校准。考虑MEMS陀螺仪动态漂移大的特点,设计了相对航向和绝对航向相互辅助的校准方案并提出了一种模糊闭环H∞滤波算法,用于提高数字磁罗盘对磁场干扰的有效识别率,减小航向误差。试验结果表明,在外部磁场干扰环境下,将MEMS陀螺仪的相对航向和DMC的绝对航向有机组合,可以提高DMC的航向精度和输出稳定性。
Aiming at the shortcomings of poor adaptability to environment of Digital Magnetic Compass (DMC), the calibration algorithm of MEMS gyroscope is used. Considering the large dynamic drift of MEMS gyroscope, the calibration scheme of relative heading and absolute heading is designed and a fuzzy closed-loop H∞ filtering algorithm is proposed to improve the efficiency of digital magnetic compass recognition and reduce the magnetic field disturbance Heading error. The experimental results show that combining the relative heading of MEMS gyroscope with the absolute heading of DMC can improve the heading accuracy and output stability of DMC under the condition of external magnetic interference.