Description: Several approaches to forming the time-frequency distributions of the non-stationary and multi-component signals based on the methods of non-parametrical and parametrical spectral and bispectral estimation are considered. The benefits and shortcomings of four approaches to time-frequency distribution forming are analyzed. Time-frequency distributions are computed both for test signals and experimental records of the radar backscattered signals. The results represented permit to assess and compare frequency resolution and interference immunity of the approaches studied.
Keywords: unstationary signal, time-frequency distribution, autoregression