变频信号的自适应相位测量系统设计

Design of Adaptive Phase Measurement System for Variable-Frequency Signal

相位是传感器响应周期性物理量的重要参数,相位变化量的高精度测量可以提供更加详细的物理信息.针对现有相位测量方法不能自适应描述信号细节的问题,以及存在传感器输出变频信号时,高频信号的相位测量值比低频信号少的问题,设计了基于压控振荡器控制技术的自适应相位测量系统.通过分析传感器输出变频信号的调理技术,研究压控振荡器的控制技术,设计了随信号频率变化自动调整测相间隔的相位测量模型,建立了相位测量系统误差模型,解决了传感器输出周期信号时测相间隔固定的问题,实现了传感器输出周期信号的自适应等相位间隔测量.并通过磁传感器响应模拟旋转磁场的相位测量实验,验证了该系统的相位测量能力,能够满足实际测量相位的需求,并同时输出信号的周期.

Phase is an important signal parameter when the sensor responds to the periodic physical variable,and phase variations can provide more detailed physical information when the phase is in high precision measurement.In view of the problem that the existing phase measurement method can＇t describe the details of the signal,and the phase measurement of the high frequency signal is less than the low frequency signal,an adaptive phase measurement system was designed using VCO control technique.In order to design the system,the characteristics of the variable frequency signal were analyzed,the control technology of V-F oscillator was studied,the phase measurement model was designed,and the model was adjusted automatically with the change of the signal frequency.And the structure of the system phase measurement error was constructed,which solved the problem of measuring the width of the phase when the sensor output frequency conversion cycle signal.Adaptive phase interval measurement of periodic signals is realized.The phase measurement capability of the system is verified using the experimental results,which measured the signal of magnetic sensors in the phase measurement of the rotating magnetic field and measured the signal period.