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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