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Based on the requirements of cognitive antijamming, this paper proposes a method to accurately estimate sweeping spectrum range and the instantaneous frequency of the nonlinear chirp signal. Considering the lack of study in nonlinear chirp signal, we utilize Short Time Fourier Transform(STFT) to analyze the non-linear chirp signal, then obtain the time-frequency distribution. The transferred results...
A novel dynamic spectrum hole sensing scheme is developed for the chirp signal. A narrow band energy detector combined with frequency scanner is used for achievement of the basic spectrum occupied scene. The Kalman filter predicts the instantaneous frequency and energy of chirp signal. Based on the predict results, the CR user can exploit the spectrum hole of chirp signal and coexist with chirp signal...
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