数字磁通门传感器的自动相位对准

三轴数字磁通门传感器信号处理电路的延时(相位延迟)及各轴延时不一致,影响数字滤波器的输出性能。提出了基于加权最小二乘法的互功率谱相位法计算延时的方法,针对该数字滤波器的特性,选择传感器的不同谐波信号对比分析相位延迟计算的精度,并设计了传感器的自动相位对准方法。实验结果表明:该计算方法精确有效,自动相位对准使滤波器输出性能提高25.89%。

Automatic phase-detection of digital fluxgate sensor

For three-axis digital fluxgate sensor,time delay(phase delay)of signal processing circuit and inconsistency of phase delay reduce the performance of the digital filter.The cross-power spectrum phase method based on weighted least squares is proposed to calculate the delay.On the basis of the analysis on the digital filter,the precisions of the filter output with different harmonic signal are compared and analyzed,and an automatic phase calibration method is designed.Experimental results show that the correlation method is reliable and easy to implement,the performance of the digital filter acquired after the automatic phase calibration is improved by 25.89%.