Internal wave parameters retrieval from SAR image: based on EMD filter and parameterized buoyancy frequency

Synthetic aperture radar (SAR) is a most useful instrument of internal waves (IWs) observation and study for its high resolution and all-weather remote sensing capability. Generally by combining the IWs hydrodynamic model and SAR image of internal wave mechanism we can retrieve the wavelength, amplitude and phase speed of IWs from SAR image. The mostly used method for this retrieve is the two-layer KdV theory which uses a two density invariable ocean fluid layer to simulate the actually continues stratified ocean fluid profile. This approximation works well for most of the shallow water but sometimes it will cause a significant error especially when the ocean stratification is weak. We propose the retrieve method based on EMD filter and parameterized buoyancy frequency for this condition.