Method for remotely sensing sea surface conductance distribution by high-frequency ground wave radar

Abstract

The invention discloses a method for remotely sensing sea surface conductance distribution by high-frequency ground wave radar. The method comprises the following steps: obtaining the power distribution of an echo at different positions of radar wave coverage area on the sea surface by radar; extracting the attenuation distribution of echo power along the detection distance from the power distribution of the echo at the different positions of the sea, namely an echo power attenuation change ratio; solving the change of an Norton attenuation factor along the detection distance when the echo is propagated on the sea surface according to the echo power attenuation change ratio; and carrying out inversion on the sea surface conductance distribution according to the relationship between the Norton attenuation factor and the sea surface conductance when the echo is propagated on the sea surface. The method for remotely sensing the sea surface conductance distribution by the radar provided by the invention is initially established, the method is simple, the cost is low, and the method can quickly detect the conductance distribution information on the sea surface in an area of tens of thousands of square kilometers. The sea surface conductance distribution can be used for calculating sea surface salinity and providing real-time observing data for oceanography researching, monitoring and forecasting of ocean disasters, estimating of ocean engineering environment and the like.

Description

technical field [0001] The invention belongs to the technical fields of radio physics and marine science, and in particular relates to a method for remotely sensing the distribution of sea surface conductivity by using high-frequency ground wave radar. Background technique [0002] Shore-based over-the-horizon radar, also known as HF Surface Wave Radar (HFSWR for short), emits electromagnetic waves with a wavelength of ten meters, which propagate along the surface in the form of surface waves (ie, ground waves). Wind-induced gravitational waves (ie, waves) on the ocean surface have comparable wavelengths. The mechanism of scattering electromagnetic waves on the rough surface of the ocean is similar to Bragg (Bragg) scattering when X-rays detect crystal structures. When the wavelength of gravity waves on the sea surface has a specific relationship with the wavelength of electromagnetic waves, it can resonate with electromagnetic waves and form strong scattered waves. Spectru...

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Problems solved by technology

At present, there is no technology to use radar remote sensing sea surface conductivity distribution

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