Computer emulation method for sea-surface imaging of bistatic synthetic aperture radar

Abstract

The invention provides a computer emulation method for sea-surface imaging of a bistatic synthetic aperture radar, and relates to the technical field of synthetic aperture radar imaging and the field of oceanography. The method simplifies and decomposes emulated true scenes into seven suitable computer emulations in an approximation degree, namely, emulation of sea-surface waves, emulation of tilt modulation generated by wave surfaces of first-scale waves, emulation of fluid power modulation generated by interaction between sea-surface waves, sea-surface bistatic correlation time simulation, divided wave spectrum emulation, sea-surface bistatic electromagnetic scattering emulation, and sea-surface synthetic aperture radar image emulation, and develops software to solve the problems one by one to generate a final emulated bistatic synthetic aperture radar sea-surface image. The method takes files as ports, integrates emulation problems of several subjects, and not only meets the requirement of final emulation, but also facilitates the development of software modules.

Description

technical field [0001] The invention belongs to the technical field of oceanography and sea surface imaging, and relates to a synthetic aperture radar sea surface imaging technology, in particular to a computer simulation method for dual-station synthetic aperture radar sea surface imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave remote sensing method developed in the late 1950s. Compared with other remote sensing methods, it has the advantages of high resolution, all-time, all-weather, and the resolution does not change with the slant distance. Many fields have been successfully applied in many fields. Ocean remote sensing is an important application field of SAR. The first synthetic aperture radar satellite SeaSAT launched by the United States in 1978 was aimed at the application of ocean remote sensing. Some later synthetic aperture radar satellites such as ERS- 1. ERS-2, EnviSAT, RADARSAT, etc. have been widely used in marine r...

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Problems solved by technology

This prior art only considers the two-station radar imaging of the ship's Kelvin wake, and cannot be directly extended to other marine applications (such as oil slicks, seabed topography, and tidal currents, etc.); It is a very important component, and its accuracy directly determines the accuracy of imaging results. In this prior art, a two-scale sea surface scattering model is used to obtain the average scattering cross-section of sea surface ship wakes, and it is now generally recognized that , the three-scale sea surface scattering model is more accurate and effective than the two-scale sea surface scattering model, and studies have shown that the second-order Bragg wave scattering will also have a significant impact on the average scattering cross-section size, the existing technology does not consider the second-order Bragg wave scattering effect

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