Sea surface temperature physical inversion method based on one-dimensional synthesis aperture microwave radiometer

Abstract

The invention discloses a sea surface temperature physical inversion method based on one-dimensional synthesis aperture microwave radiometer. The method comprises the steps of: firstly, constructing an initial background field ( frequency f, sea surface temperature Ts, seawater salinity S, incident angle Theta, sea surface wind speed W, sea surface relative wind direction atmospheric water vapor content V, cloud liquid water content L), providing data support for sea surface temperature inversion; secondly, according to the characteristics observed by the one-dimensional comprehensive aperturemicrowave radiometer in multi-incident angle, calculating a mode brightness temperature in an atmospheric top scene at frequency of 6.9 GHz and different incident angles by using a microwave radiation transmission forward model, adding random errors in the mode brightness temperature to simulate the observed brightness temperature of the one-dimensional synthetic aperture microwave radiometer; and finally, constructing a cost function by using a physical inversion method based on maximum likelihood Bayesian estimation, inverting the sea surface temperature through a minimization cost function. The sea surface temperature physical inversion method provided by the invention solves the problem that the sea surface temperature inversion is difficult in multiple incident angles and improves the sea surface temperature inversion effect.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a physical inversion method of sea surface temperature based on a one-dimensional synthetic aperture microwave radiometer. Background technique: [0002] Sea surface temperature (SST) plays an important role in global climate change and long-term weather processes. Passive microwave remote sensing can conduct all-weather and all-day uninterrupted observations. One of the representative instruments for passive microwave remote sensing is the real-aperture microwave radiometer, which can provide products of various marine environmental elements including sea surface temperature. However, because the spatial resolution of the real-aperture microwave radiometer is limited by the size of the antenna, its spatial resolution is relatively low. To address this shortcoming, a one-dimensional synthetic aperture microwave radiometer is designed. Different from the mechanical scanni...

AI Technical Summary

Problems solved by technology

However, due to the difference in imaging methods, the existing real-aperture microwave radiometer sea surface temperature retrieval algorithm cannot be applied to the one-dimensional synthetic aperture microwave radiometer

Traditional real-aperture microwave radiometers generally scan and image at a fixed incident angle, while synthetic aperture microwave radiometers are staring images of scenes, and their incident angles generally change within a certain range, which is more complicated than real-aperture microwave radiometers.

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