Application of Bispectrum Estimation for Time-Frequency Analysis of Ground Surveillance Doppler Radar Echo Signals. - Jaakko T. Astola; Karen O. Egiazarian; Grigory I. Khlopov; Stanislav I. Khomenko; Igor V. Kurbatov; Vladimir Ye. Morozov; Alexander V. Totsky (IEEE Trans. Instrum. Meas., 2008)