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Method and system for improving SAR azimuth resolution or detectability through aperture segmentation

A technology with azimuth resolution and detection capability, applied in the field of radar, can solve the problems of azimuth resolution limitation and azimuth antenna size limitation reduction

Pending Publication Date: 2022-04-22
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology

The azimuth resolution of the strip SAR imaging mode is limited by the size of the radar antenna, that is, it cannot be less than half the length of the azimuth antenna. In actual system design, it is impossible to reduce the size limit of the azimuth antenna without limit. Therefore, to improve the azimuth of the SAR Resolution is limited
[0005] Therefore, there is a need in the art for a synthetic aperture radar working method and system that can overcome the limitations of traditional strip SAR imaging to improve azimuth resolution

Method used

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  • Method and system for improving SAR azimuth resolution or detectability through aperture segmentation
  • Method and system for improving SAR azimuth resolution or detectability through aperture segmentation

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Embodiment Construction

[0034] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] refer to figure 1 , is a schematic diagram of a radar system that splits the aperture to improve SAR azimuth resolution or detection capability.

[0036] According to an embodiment of the present invention, the radar system for improving SAR azimuth resolution or detection capability by splitting the aperture includes:

[0037] The radar antenna is configured to be divided into multiple apertures to form N apertures, where N is a positive integer greater than 1, and different apertures have independent radar signal transmission and reception links;

[0038] An aperture coded signal generation unit configured to generate coded signals transmitted by N apertures, where the N apertures transmitted signals are individually pulse coded and frequency-converted or / and modulated to a radio frequency;

[003...

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Abstract

The invention provides a method and a system for improving SAR (Synthetic Aperture Radar) azimuth resolution or detectability through aperture segmentation. According to the embodiment of the invention, the system for improving the SAR azimuth resolution or detection capability through aperture segmentation can comprise an aperture coding signal generation unit, a transmitting assembly, an antenna, a receiving assembly, a data acquisition unit, a decoding processing unit, an imaging processor, a control unit and the like. The method and the system for improving the SAR azimuth resolution or the detection capability by segmenting the aperture have the advantages that the theoretical limitation of the antenna size on the traditional strip SAR imaging resolution can be broken through, a strip SAR image with high azimuth resolution can be obtained, or the signal-to-noise ratio of the strip SAR image can be enhanced, the detection performance of the SAR system can be improved, and the like.

Description

technical field [0001] Embodiments of the present invention relate to the field of radar technology, and in particular to a method and system for improving SAR azimuth resolution or detection capability by dividing an aperture. Background technique [0002] Synthetic aperture radar (SAR) can achieve high-resolution imaging of targets. SAR uses pulse compression to improve range resolution, and synthetic aperture to improve azimuth resolution. [0003] SAR has different imaging modes, including strip imaging, scanning imaging, spotlight imaging, etc. [0004] In the existing technology, strip SAR imaging is the earliest and most widely used SRA imaging mode at present. The imaging area of ​​strip SAR imaging is a long strip area parallel to the direction of motion of the carrier aircraft (or satellite and other carrier platforms). The radar beam is perpendicular to the flight track, that is, the front side view, and it can also work in the squint mode. During the imaging pro...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9021G01S7/41
Inventor 王岩飞韩松李和平
Owner AEROSPACE INFORMATION RES INST CAS
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