Sea surface brightness temperature imaging simulation method based on one-dimensional synthetic aperture microwave radiometer

Abstract

The invention discloses a sea surface brightness temperature imaging simulation method based on a one-dimensional synthetic aperture microwave radiometer. The method comprises the following steps of:constructing initial background field data (frequency f, sea surface temperature Ts, seawater salinity S, incident angle [Theta], sea surface wind speed W, sea surface relative wind direction phi, atmospheric water vapor content V, cloud liquid water content L) to provide data support for sea surface brightness temperature imaging simulation; calculating the brightness temperature of the scene mode at the top of the atmosphere at different incident angles with a frequency of 6.9 GHz by using a microwave radiation transmission forward model according to the observation characteristics of the multi-incident angle of the one-dimensional synthetic aperture microwave radiometer; receiving a scene brightness temperature signal by the small antenna array of the one-dimensional synthetic aperturemicrowave radiometer to generate an electrical signal, and performing pairwise complex correlation on antenna output voltages to obtain a visibility function; and reconstructing a sea surface brightness temperature image by mathematical operations such as inverse Fourier transform. The method provides technical support for remote sensing sea surface temperature of satellite-bone one-dimensional synthetic aperture microwave radiometer.

Description

technical field [0001] The invention relates to the field of remote sensing, in particular to a sea surface brightness temperature imaging simulation method 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. In practice, in the field of remote sensing, only the sea surface brightness temperature can be observed, and the sea surface temperature is obtained by inversion of the sea surface brightness temperature. Therefore, the sea surface brightness temperature imaging has far-reaching significance. Passive microwave remote sensing can perform all-weather, all-day uninterrupted observations, and one of the representative instruments of passive microwave remote sensing is the real aperture microwave radiometer, which can provide a variety of marine environmental elements including sea surface temperature. However, since...

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Problems solved by technology

However, due to the difference in imaging methods, the real aperture microwave radiometer sea surface brightness temperature imaging method 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.

[0003] Since there is currently no spaceborne one-dimensional synthetic aperture microwave radiometer for sea surface temperature (SST) observation, it is necessary to design a simulation method for sea surface brightness temperature imaging with a spaceborne one-dimensional synthetic aperture microwave radiometer

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