A parameter estimation method for linear amplitude modulated chirp signals based on Discrete Fractional Fourier Transform

A new parameter estimation method for linear amplitude modulated chirp signal is proposed. This method utilizes the discrete fractional Fourier transform (DFRFT) along with Radon Wigner transform (RWT) to estimate the amplitude and phase parameters of multi-component chirp signals. Expressions of DFRFT for estimating amplitude and initial phase parameters are derived. The chirp rate and initial frequency is estimated using RWT. Performance of the proposed method in noise is analyzed by Monte-Carlo simulation for different signal to noise ratio (SNR). Better performance was achieved at SNR as low as -10 dB.