改进的迟延相位差多信号频率估计应用

Application on the Improved Frequency Estimation of Multi Signal Based on Delayed Phase Difference

给出了一种多信号欠采样频率估计算法。该算法通过迟延相位差的允许误差求出频率大致取值区间,利用欠采样频谱结果求出多个信号的高精度频率估计值,并重点解决了当不同信号因欠采样出现谱峰重叠时测频不准确的难题。仿真表明,该算法具有良好的抗噪性能,且估计精度高。

A sub-sampling frequency estimation algorithm is proposed to aim at multi signals. By using the allowed error of delayed phase difference,the range of frequencies is roughly obtained. Then the high-accuracy frequency estimation values of multi signal are obtained based on the sub sampling frequency domain results. The problem that the wrong results are gained when the phenomenon of peak overlapping happens in sub-sampling spectrogram is solved. The results of simulation show that the algorithm has good anti-noise capability to get high-precision estimates.