摘要
提出了采用数字式正交检波技术得到I、Q通道的方法 ,以此来测量相位 ,获取传感信息 ,很好地解决了在无线声表面波传感器测量系统中测量时间差精度低的问题。在检波过程中 ,采用了Hilbert变换法 ,简单易行 ,且运算量小 ,精度高。通过实验仿真和误差分析 ,表明该方法性能良好 ,与传统的正交检波器相比 ,测量精度大大提高。此外 。
In order to solve the problem of low accuracy in measuring time difference in SAW based wireless sensor system,a method of digital quadrature demodulation is presented.In the demodulation process,Hilbert transform is adopted to measure phase and obtain the sensing information.The method shows more excellent performance by simulation and error analysis for the narrow band reflected signal by SAW sensor.Compared with the existing quadrature detector traditionally realized by hardware,the measured accuracy is promoted greatly.Besides,the influence of ADC is also analyzed to the digital quadrature detector.
出处
《测控技术》
CSCD
2002年第3期4-6,共3页
Measurement & Control Technology
