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摘要: 为提高磁通门罗盘的指向精度和稳定性, 提出了磁通门罗盘的数字信号处理方法。利用微处理器直接产生激励信号, 通过模数转换采集磁通门传感器感应的磁场信号, 对所采集的原始信息进行傅里叶变换获取偶次谐波, 得到罗盘方位值。计算结果表明: 二次谐波的波形幅度在各偶次谐波中最大, 其提取精度至少提高5倍, 而且采用多个偶次谐波并行使用解算方位的方法, 降低了原始噪声, 增大了原始信息的利用率, 提高了磁通门传感器的灵敏度, 因此, 数字信号处理方法可行。Abstract: In order to improve the pointing precision and stability of fluxgate compass, a digital signal processing method was put forward. Driving signal was generated by micro processor, magnetic field digital signal from fluxgate sensor was collected by convert analog, even harmonics were obtained by Fourier transform from original signal, and the orientation of fluxgate compass was calculated according to even harmonics. Computation result shows that the amplitude of quadratic harmonic is biggest, its extraction precision is improved by five times at least, the noise of original signal is reduced, its using efficiency is enhanced and the sensitivity of fluxgate sensor is improved because of the computed orientation from multiple even harmonics, so the method is feasible.
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