Method for performing submarine speed and diameter estimation by utilizing SAR image

Abstract

The invention provides a method for performing submarine speed and diameter estimation by utilizing a SAR image. The method comprises the following steps of reading the SAR image containing submarineturbulence trail; acquiring turbulence trail semi-width curves of different submarine diameters; calculating the least square error, wherein the least error is the corresponding submarine diameter; and performing submarine speed estimation. Through the method provided by the invention, the inversion research is performed based on the actual data, the capacity of scouting a submarine target througha SAR satellite can be favorably improved without depending on the laboratory flume experiment and hydrodynamic calculation, and the method gets closer to the engineering application.

Description

technical field [0001] The present disclosure relates to the field of synthetic aperture radar (SAR) marine remote sensing detection, and in particular to a method for estimating the velocity and diameter of a submarine using SAR images. Background technique [0002] The penetration ability of microwave to seawater is only on the order of centimeters, and microwave submarine detection is the remote sensing detection of the wake generated by the moving submarine. The region where the submarine passes causes weak contrast anomalies on the sea surface (usually called wakes), resulting in changes in the scattering characteristics and spatial structure of the sea surface. When the wavelength of the radar incident electromagnetic wave is close to the order of magnitude of its scale, the so-called Bragg scattering will be generated, so that stronger radar echo signal. The underwater movement of a submarine will produce a wake feature on the sea surface (free surface). This wake fe...

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Problems solved by technology

In related studies, the turbulent ship width formula was used to estimate the ship speed and ship width, but it was only applied to surface ships instead of submarines

In addition, related studies have proposed the vortex structure of the turbulent wake, the average velocity distribution of the turbulent wake of the submarine (submarine model), the evolution process and geometric scale of the turbulent wake, etc., and provided the forward modeling results of the submarine wake carried out in the laboratory. But no inversion studies were done, and based on laboratory data, not actual SAR image data

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