FMCW物位测量雷达距离测量精度的提高(英文)

Improvement of measurement accuracy of FMCW level radar

FMCW物位测量雷达通过差拍信号的频率测量距离 ,根据差拍信号DFT幅度最大值的位置可以粗测距离 .为了提高FMCW雷达的距离测量精度 ,提出了一种基于差拍信号相位的距离估计方法 .对差拍信号分两段进行FFT ,并利用两段信号的FFT在幅度最大值处的相位差消除相位测量中出现的整周模糊 .导出了距离估计均方根误差的计算公式 ,进行了仿真试验 。

The range measurement of the FMCW radar is based on the estimation of the frequency of the beat-note signal. The rough estimation of the frequency can be made from the location of the maximum value of the DFT amplitude of the beat-note signal. To improve the range measurement accuracy a range estimation method for FMCW level radar based on the phase of the FFT of the beat-note signal is presented. The ambiguity in the phase measurement is eliminated by the phase difference of two segmented FFTs. Formula for...