Beam-bunching SAR full-aperture processing method based on time domain de-aliasing

A processing method and full-aperture technology, which is applied in the field of spotlight SAR full-aperture processing based on time-domain de-aliasing, can solve the problems of self-focusing processing that cannot be merged, aliasing, and limited applications, etc., to achieve compensation error phase and efficient execution , the effect of improving image quality

Active Publication Date: 2022-01-07
AEROSPACE INFORMATION RES INST CAS
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  • Abstract
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Problems solved by technology

However, the azimuth and time domain of the spotlight SAR data processed by this method are aliased, which makes the autofocus processing unable to integrate with this method, which limits the application of this method to spotlight SAR data with long synthetic aperture time

Method used

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  • Beam-bunching SAR full-aperture processing method based on time domain de-aliasing
  • Beam-bunching SAR full-aperture processing method based on time domain de-aliasing
  • Beam-bunching SAR full-aperture processing method based on time domain de-aliasing

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Embodiment 1

[0084] The present invention uses the airborne spotlight SAR system and scene parameters shown in Table 1 to perform simulation to verify the effectiveness of the technical solution of the present invention.

[0085] Table 1 Simulation airborne spotlight SAR system parameters and scene parameters

[0086]

[0087] figure 2 is the distribution of point targets in the scene, the point targets are separated by 1.1Km in the distance direction and 0.4Km in the azimuth direction.

[0088] image 3 is the amplitude image after RCMC of target echo data at the center point of the scene (processed in step 102): (a) RD domain amplitude image, (b): two-dimensional time domain amplitude image, (c): image 3 (a) The frequency-time diagram of the Short Time Inverse Fourier Transform (STIFT) along the azimuth frequency in the range unit where the target is located. image 3 In (a), the distance unit where the point target is located is smooth and stable along the azimuth frequency ampl...

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Abstract

The invention discloses a beam-bunching SAR full-aperture processing method based on time domain de-aliasing. The beam-bunching SAR full-aperture processing method comprises the following steps of: step 1, removing aliasing of pre-processed beam-bunching SAR data in an azimuth frequency domain; step 2, performing range migration correction (RCMC) on the beam-bunching SAR data after azimuth frequency domain de-aliasing by using a frequency domain imaging algorithm; step 3, removing aliasing of beam-bunching SAR data in an azimuth time domain after RCMC; step 4, performing error phase estimation and compensation on the beam-bunching SAR data after time domain de-aliasing by using a phase gradient autofocus algorithm PGA; step 5, removing aliasing of the beam-bunching SAR data in the azimuth frequency domain after phase error compensation, and then completing focusing of the beam-bunching SAR data through azimuth matched filtering. According to the invention, the full-aperture focusing processing of the bunching SAR data under the long synthetic aperture time can be simply, efficiently and accurately realized.

Description

technical field [0001] The invention relates to a full-aperture processing method of a beamforming synthetic aperture radar (Synthetic Aperture Radar, SAR). Background technique [0002] Spatial geometric resolution is the core performance index of synthetic aperture radar. This active microwave remote sensing device obtains high resolution in the range direction of the target scene by transmitting large-bandwidth frequency modulation signals, and obtains high resolution in azimuth direction through azimuth synthetic aperture technology. . Spotlight SAR is the imaging mode with the highest azimuth resolution among all SAR imaging modes. By controlling the pointing of the radar antenna beam, the target in the scene is always irradiated during the whole data acquisition process, which greatly increases the image quality of the scene. The azimuth synthetic aperture angle of the medium target improves the azimuth resolution of the target and breaks the limitation of the azimuth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9052
Inventor 邓云凯任明山张衡禹卫东陈圳
Owner AEROSPACE INFORMATION RES INST CAS
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