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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 ,试验结果与给出的公式计算结果相吻合
The FMCW level measurement radar can measure the distance by the frequency of the beat signal, and the distance can be roughly measured according to the maximum amplitude of the beat signal DFT.In order to improve the distance measurement accuracy of the FMCW radar, a distance estimation based on the phase of the beat signal is proposed Methods The beat signal is divided into two sections to perform FFT, and the phase difference at the maximum amplitude of the FFT of two sections of signals is used to eliminate the whole-week ambiguity appearing in the phase measurement. The calculation formula of the root mean square error The simulation results show that the experimental results are consistent with the calculated results