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Image characteristic enhancement method and system based on multi-azimuth SAR observation

An enhanced system and multi-directional technology, which is applied in the field of synthetic aperture radar azimuth and multi-angle observation image processing, can solve problems such as partial shadows, top-bottom inversion, and image overlapping, so as to improve the signal-to-noise ratio, overcome image overlapping, and improve The effect of processing efficiency

Pending Publication Date: 2022-04-15
SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical purpose of the present invention is to provide an image feature enhancement method and system based on multi-azimuth SAR observations to solve the problems of image overlapping, top-bottom inversion, and local shadows caused by observation angles of view in traditional modes

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  • Image characteristic enhancement method and system based on multi-azimuth SAR observation
  • Image characteristic enhancement method and system based on multi-azimuth SAR observation
  • Image characteristic enhancement method and system based on multi-azimuth SAR observation

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Embodiment 1

[0063] An image characteristic enhancement method based on multi-position angle SAR observations, including the following steps:

[0064] First, in step S1, a large angular / circular SAR echo data is acquired by a multi-view image generating module and subjected to a sub-aperture SAR echo data of different perspectives, and imaging based on sub-aperture SAR echo data. To obtain a sub-aperture image sequence set of different observation angles.

[0065] Specifically Step S1 can be divided into two steps.

[0066] First, in step S11, sub-aperture segmentation of the large angle / circular SAR echo data is performed according to the critical synthetic aperture time, and the sub-aperture SAR echo data of different angles is obtained;

[0067] Calculation formula of critical synthetic aperture time is

[0068]

[0069] Among them, ρ a The azimuth resolution, λ is wavelength, R st To Ray to the slack of the scene center, V s For satellite speed.

[0070] Then, in step S12, the sub-ap...

Embodiment 2

[0090] See figure 1 This embodiment provides an image characteristic enhancement system based on multi-position angle SAR observations, which is combined with an image characteristic enhancement method based on multi-directional angular SAR observation. Specifically, a multi-view image generating module, a multi-view image correction module, and a multi-view scattering characteristic enhancement module.

[0091] The multi-view image generating module is connected to the multi-view image correction module signal, configured to obtain a large angle / circular SAR echo data and subjected to a sub-aperture SAR echo data of different perspectives, based on sub-aperture SAR back Wave data performs imaging processing to obtain a sub-aperture image sequence set of different observation angles.

[0092] In this module, sub-aperture segmentation of large angle / circular SAR echo data is performed according to the critical synthetic aperture time, and the sub-aperture SAR echo data of diffe...

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Abstract

The invention discloses an image characteristic enhancement method based on multi-azimuth SAR observation, and the method comprises the following steps: S1, obtaining large-angle / circular SAR echo data, carrying out the sub-aperture segmentation of the large-angle / circular SAR echo data, obtaining the sub-aperture SAR echo data of different visual angles, carrying out the imaging processing based on the sub-aperture SAR echo data, and obtaining a sub-aperture image sequence set of different observation visual angles; s2, performing geometric correction and amplitude correction based on the sub-aperture image sequence set to obtain a corrected sub-aperture image sequence set; and S3, amplitude fusion processing is carried out according to the corrected sub-aperture image sequence set so as to obtain an SAR image after scattering characteristic enhancement. According to the method, complementarity of multi-angle observation information is fully utilized, and target side lobes are effectively suppressed, so that target scattering information in an SAR image is greatly enriched while a high-definition image is obtained; the signal-to-noise ratio can be effectively improved; hidden targets can be tracked and detected; the treatment efficiency is greatly improved.

Description

Technical field [0001] The present invention belongs to the field of synthetic aperture radar azimuth multi-angle observation image processing, and more particularly to an image characteristic enhancement method and system based on multi-position angle SAR observations. Background technique [0002] Synthetic Aperture Radar, SAR is a proactive remote sensing device, all day, has a wide range of applications in military, civilian and other fields, which has become high-resolution observations and global resources. One of the important means of management. In order to more clearly detect important terrestrial scenes and enhance the interpolatableness of SAR images, high quality images have always been an important direction for SAR technology development. The SAR multi-position angle observation is a new observation mode in recent years, through repeated observations of the same region in different azimuth, to make up for the multi-view geometric information and scattering informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 毛琴钱城嵇玮玮金戈孙彦龙徐显文
Owner SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
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