Bispectrum property analysis of high resolution real sea clutter

This paper mainly investigates the bispectrum property of sea clutter. For non-Gaussian sea clutter, bispectrum can reveal its property from higher-order probability structures, which is complementary to current second-order theory based research. Bispectrum estimation of sea clutter is accomplished by using the FFT-based method with a frequency-domain Rao-Gabr window. Analysis results show that pronounced peaks exist in the diagonal slice spectra, revealing the quadratic-phase coupling phenomenon in sea clutter spectra. Besides, bispectrum features such as peak location or distribution regions differ between sea clutter and target bins, showing its potential in the design of target detection algorithms.