针对基于信号到达相位差（Phase difference of arrival ，PDOA）双频比相法测距方案频率选取随机性大，导致测距结果精度低等缺点，提出了一种基于频域的信号到达相位差（Phase difference of ar‐rival in frequency domain ，FD‐PDOA ）双频比相法测距方案。结合最小二乘法以及一次线性回归的思想，建立了测距的数学模型。利用M atlab对实验数据进行仿真分析表明：在0．5 m和1．0 m处，若采用PDOA双频比相法测距方案，误差分别在50％和30％上下浮动；采用FD‐PDOA双频比相法测距方案，从整体上分析相位差值的变化特性，误差在10％上下浮动，进一步提升了测距精度。%To overcome the drawbacks of phase difference of arrival (PDOA )dual‐frequency comparison ranging method ,i .e .large frequency selection random and low measuring distance accuracy ,the phase difference of arrival in frequency domain (FD‐PDOA) dual‐frequency comparison ranging method is pro‐posed .Combining with the least square method and linear regression ,a mathematic model is built to measure the distance .Simulation results show that the measurement error of PDOA dual‐frequency com‐parison ranging method floats at 50% and 30% at distance 0 .5 m and 1 .0 m respectively ,while the measurement error of FD‐PDOA dual‐frequency comparison ranging method is reduced to 10% through an overall analysis of the phase difference change characteristics ,and the method considerably improve the measuring distance accuracy .
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