Three-dimensional base line integration aperture imaging method based on array factor integration

Abstract

The present invention discloses a three-dimensional base line integration aperture imaging method based on array factor integration. The method comprises: calculating a base line vector coordinate sequence and removing redundant base lines wherein to form integrated aperture array non-redundancy uvw distribution; filling a visibility function corresponding to non-redundancy uvw according to the multiple correlation output through system output, obtaining a non-redundancy visibility function vector, and performing discretization of scene brightness temperature distribution; establishing an integration aperture forward model according to the redundancy average visibility function, the non-redundancy uvw distribution, the scene discretization distribution and an extinction fringe function, and establishing an optimal weight solution model according to the inversion image noise minimization and the array directional diagram major lobe pointing observation direction; and traversing object scene observation points, calculating the brightness temperature of each observation point according to an optimal weight, and obtaining an inversion image. Compared to a traditional inversion method based on a G matrix, the three-dimensional base line integration aperture imaging method based on array factor integration is equivalent in prevision, but is better in inversion efficiency and storage space occupation.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and detection, and more specifically relates to a three-dimensional baseline comprehensive aperture imaging method based on array factor synthesis applied under the condition of three-dimensional array. Background technique [0002] The synthetic aperture radiometer adopts a fully passive way to receive the spontaneous radiation energy of the object. It has the characteristics of high resolution and conformal arrangement. It has been widely used in the fields of radio astronomy, microwave remote sensing and target detection. However, the synthetic aperture system belongs to the transformation domain measurement and cannot directly obtain the brightness temperature distribution of the target scene, so the key lies in processing the visibility sampling data output by the system to obtain the brightness temperature distribution of the scene. For plane baseline inversion, its methods ...

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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a stereo baseline synthetic aperture imaging method based on array factor synthesis, the purpose of which is to solve the current The inversion method based on G matrix has technical problems of low inversion efficiency and large storage space

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