Joint observation method for sea surface wind field, sea wave and sea current

Abstract

The invention belongs to the technical field of remote sensing, and particularly relates to a joint observation method for sea surface wind field, sea wave and sea current, which comprises the following steps of: 1) transmitting a group of difference frequency pulse signals to a sea surface to obtain different wavelength components of a sea wave spectrum; 2) transmitting a pulse signal to the sea surface to obtain sea surface backscattering coefficients and Doppler frequency shifts under different azimuth angles; 3) utilizing a result of the step 1) to invert and obtain sea surface sea wave spectrum information; 4) utilizing back scattering coefficient inversion to obtain sea surface wind field information; 5) estimating Doppler frequency shift caused by a sea surface wind field and sea waves based on a sea surface Doppler spectrum model according to results obtained in the step 3) and the step 4); and 6) subtracting the Doppler frequency shift caused by the movement of the satellite platform and the Doppler frequency shift caused by the sea surface wind field and the sea wave obtained in the step 5) from the Doppler frequency shift obtained in the step 2), estimating the Doppler frequency shift caused by the sea surface flow field, and further performing inversion to obtain sea surface flow field information.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, and in particular relates to a joint observation method of sea surface wind field, sea wave and sea current. Background technique [0002] The marine environment is a complex and changeable whole that includes a variety of elements. Ocean currents are one of the important marine dynamic environmental parameters, and an important regulator of global climate and regional climate. Ocean current is a large-scale relatively stable non-periodic seawater movement formed by seawater due to factors such as heat radiation, evaporation, precipitation, and cold shrinkage to form water masses with different densities, coupled with wind stress, geostrophic deflection force, and tidal force. flow. Most of the ocean currents on the surface of the world's oceans are wind-induced ocean currents according to their causes. Ocean currents are also the only parameters (wind, wave, current, temperature, salini...

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Problems solved by technology

[0009] In order to solve the above-mentioned defects existing in the prior art, the present invention proposes a joint observation method of sea surface wind field, ocean wave and ocean current, which can measure sea surface wind field, ocean wave and and ocean currents, to achieve wide-swath observations, overcome the problem of low retrieval accuracy of the sea surface current field existing in existing observation methods, and improve the retrieval accuracy of the sea surface current field

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