一种双正弦信号的快速频率测量方法
Fast Frequencies Measurement Method for Dual Sinusoidal Signals
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摘要: 信号频率测量在雷达信号处理中起到重要的作用。基于DFT和自相关理论，该文提出了一种双正弦信号频率的快速估计方法。该方法先用DFT估计其中一个频率及其幅度，以此频率对信号解调并对消该频率成分，最后利用自相关理论估计信号的频差。计算机模拟证实了方法具有精度高、测频速率快的特点。Abstract: The frequency measurement for dual signals is crucial in radar signal processing. A method, which realizes the fast frequency measurement for dual sinusoidal signals basing on DFT and autocorrelation theory, is given. Firstly, one frequency and its amplitude are determined by DFT, with which to demodulate the signals and eliminate the corresponding component. Then, the gap of the two frequencies is estimated using the autocorrelation theory. Computer simulation confirms that the method is of high precision and fast frequency measurement.
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