The sweeping spectrum range and the instantaneous frequency estimation of the nonlinear chirp signal

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 SPWVD to analyze the non-linear chirp signal, then obtain the time-frequency distribution. The transferred results are utilized to estimate the sweeping spectrum range and the instantaneous frequency, with the use of curve fitting tool. Simulation results are well consistent with our expectation.