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研究了在空间中独立的两个传感器接收到的复正弦信号的时延估计问题。在频率已知的前提下,设计出利用接收信号的离散傅立叶变换相位差的简单时延估计器。使用周期图该算法还可以用于估计未知频率信号的时延。并计算出在信号频率已知或未知、恒定或矩形包络情况下时延估计的最小方差。对实正弦信号的时延估计进行了研究。通过对不同频率、包络和噪声限制条件下的估计特性进行比较,显示出该方法的效果。
The time delay estimation of complex sinusoidal signals received by two independent sensors in space is studied. Under the condition of known frequency, a simple time delay estimator using phase difference of discrete Fourier transform of received signal is designed. The use of the cycle diagram The algorithm can also be used to estimate the unknown frequency signal delay. And calculate the minimum variance of the delay estimate in the case of a constant or rectangular envelope with a known or unknown signal frequency. The time delay estimation of real sinusoidal signal is studied. By comparing the estimation characteristics under different frequency, envelope and noise constraints, the effect of this method is demonstrated.