Segmented Image Inversion Method for 3D Antenna Array Synthetic Aperture Radiometer

Abstract

The invention discloses a segmented image inversion method of a three-dimensional antenna array synthetic aperture radiometer. The method comprises: dividing the observation field of view interval into N sub-intervals; placing an external correction source in each of the divided N field of view sub-intervals; sequentially measuring the comprehensive aperture of the three-dimensional antenna array in the N field of view sub-intervals of the external correction source Obtain the phase angle of the visibility function from the visibility function output by the radiometer; simulate and calculate the phase of the visibility function when the three-dimensional antenna array synthetic aperture radiometer only has two-dimensional coordinates; subtract the phase angle measured by the N field of view sub-intervals from the simulation to obtain The phase angle of the n-th field of view sub-interval is obtained; the target scene is observed using a three-dimensional antenna array synthetic aperture radiometer, and image inversion is performed on the divided N field of view sub-intervals in turn; the N field of view sub-intervals are The inverted images in the interval are stitched into an inverted image in the entire field of view. This method has high precision and has a good application prospect.

Description

technical field [0001] The invention relates to the technical fields of microwave remote sensing, target detection and deep space detection, in particular to a segmented image inversion method of a three-dimensional antenna array synthetic aperture radiometer. Background technique [0002] The synthetic aperture radiometer uses multiple discrete small antennas to synthesize an equivalent large antenna aperture, and adopts a sparse array arrangement to reduce the mass and volume of the antenna, which can improve the spatial resolution of passive microwave remote sensing and detection equipment. In order to ensure the quality of the inverted image, the antenna array of the synthetic aperture radiometer can only be arranged into a one-dimensional linear array and a two-dimensional planar array. In applications such as target detection and deep space exploration, it is inevitable to arrange the antenna array in a three-dimensional array. [0003] At present, there are no report...

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Problems solved by technology

[0004] Aiming at the defect of poor inversion accuracy of the three-dimensional antenna array synthetic aperture radiometer and the need for improvement, the present invention provides a segmented image inversion method of the three-dimensional antenna array synthetic aperture radiometer, whose purpose is to accurately invert the three-dimensional antenna array synthetic Scene brightness temperature distribution image from aperture radiometer

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