Self-focusing method suitable for ultra-high-resolution SAR (synthetic aperture radar) imaging

An ultra-high-resolution, self-focusing technology, applied in the direction of re-radiation, radio wave reflection/re-radiation, and measurement devices, can solve problems such as azimuth phase error and residual distance migration of ultra-high-resolution SAR imaging. Achieve high estimation accuracy, high compensation accuracy, and high calculation efficiency

Inactive Publication Date: 2012-11-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of simultaneous correction of residual range migration and azimuth phase error in ultra-high resolution SAR imaging

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  • Self-focusing method suitable for ultra-high-resolution SAR (synthetic aperture radar) imaging
  • Self-focusing method suitable for ultra-high-resolution SAR (synthetic aperture radar) imaging
  • Self-focusing method suitable for ultra-high-resolution SAR (synthetic aperture radar) imaging

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Spotlight SAR imaging geometric model such as figure 1 As shown, without loss of generality, it is assumed that the radar works in squint mode, and the squint angle is θ 0 , the side view corresponds to θ 0 =0. The radar platform is flying in a straight line at a speed v horizontally and uniformly, and the instantaneous position coordinates of the antenna phase center (APC) are (x 0 +vt,y 0 ,z 0 ), where t represents the azimuth time, at the aperture center time t=0, θ 0 +θ and are the instantaneous azimuth and elevation angles of the antenna phase center respectively, which are equal to θ at the moment of the aperture center 0 and Also assume that there is a point target in the scene, its position is (x p ,y p ). The instantaneous distances from the antenna phase center to the target and the scene center are denot...

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Abstract

The invention relates to a self-focusing of method suitable for the ultra-high-resolution SAR (synthetic aperture radar) imaging, comprising the following steps: (1) subjecting the two-dimensional echo data to polar coordinate format conversion; (2) reducing the resolution of the distance vector; (3) carrying out coarse-resolution imaging to the distance vector; (4) estimating the azimuth phase error; (5) calculating the residual range migration; (6) compensating the residual error; and (7) carrying out two-dimensional Fourier transform for imaging.

Description

technical field [0001] The invention relates to a synthetic aperture radar (synthetic aperture radar, referred to as SAR) imaging signal processing method, in particular to a synthetic aperture radar self-focusing algorithm. Background technique [0002] Synthetic Aperture Radar (SAR for short) is a new radar system that uses signal processing technology to image ground objects. The imaging of the target by SAR is realized by two-dimensional high-resolution of distance and azimuth. The high-resolution in the range direction is obtained by pulse compression processing of broadband signals, while the high-resolution in azimuth is realized by coherent processing of synthetic aperture data. Processing relies on accurate knowledge of the instantaneous relative position information between the radar and the target. In practical applications, due to factors such as radar position disturbance and uneven electromagnetic wave propagation medium, it is often difficult to directly guar...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S7/41G01S13/90
Inventor 毛新华朱岱寅丁岚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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