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Precise focusing method and device for high-resolution scanning synthetic aperture radar

A synthetic aperture radar, precise focusing technology, applied in measurement devices, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as the inability to directly apply the full-aperture ScanSAR data processing algorithm, and achieve the effect of improving image quality

Active Publication Date: 2015-01-14
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the periodic data gaps in each sub-swath of ScanSAR data, none of the above motion compensation techniques can be directly applied to the full-aperture ScanSAR data processing algorithm

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  • Precise focusing method and device for high-resolution scanning synthetic aperture radar
  • Precise focusing method and device for high-resolution scanning synthetic aperture radar
  • Precise focusing method and device for high-resolution scanning synthetic aperture radar

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Embodiment Construction

[0039] In the embodiment of the present invention, the ScanSAR data of each sub-swath is divided into two-dimensional sub-apertures, and DRE estimation is performed on each two-dimensional sub-aperture; the ScanSAR data of the entire survey swath is subjected to range-to-space DRE estimation; The azimuth error estimation is performed on the ScanSAR data after the range space-varying DRE estimation; the full-aperture phase error correction and azimuth compression are performed on the ScanSAR data of each sub-swath.

[0040] Wherein, the ScanSAR data is ScanSAR data compressed in the range direction but uncompressed in the azimuth direction.

[0041] After performing full-aperture phase error correction and azimuth compression on the ScanSAR data of each sub-swath to obtain the images of each sub-swath, the method further includes: performing image stitching on the images of each sub-swath to obtain a focused ScanSAR image .

[0042] The implementation of the technical solution...

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Abstract

The invention discloses a precise focusing method for high-resolution scanning synthetic aperture radar (ScanSAR). The method comprises the steps that two-dimensional sub-aperture segmentation is carried out on ScanSAR data of each sub surveying and mapping zone, and Doppler rate error (DRE) estimation is carried out on each two-dimensional sub-aperture; range-dependent DRE estimation is carried out on ScanSAR data of a whole surveying and mapping zone; azimuth error estimation is carried out on the ScanSAR data obtained after the range-dependent DRE estimation is carried out; full aperture phase error correction and azimuth compression are carried out on the ScanSAR data of each sub surveying and mapping zone. The invention further discloses a precise focusing device for the high-resolution ScanSAR.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar (SAR, Synthetic Aperture Radar) data processing, in particular to a high-resolution scanning synthetic aperture radar (Scanning Synthetic Aperture Radar) precise focus processing method and device. Background technique [0002] ScanSAR is a wide swath SAR mode composed of multiple sub-swaths. Its principle is to obtain ultra-wide swath coverage by time sharing between two or more sub-swaps. During ScanSAR imaging, the total scanSAR swath width is equal to the sum of the sub-swath widths. For each sub-swath, the usual radar working mode is a burst mode; the so-called burst refers to a group of continuous pulse sequences from continuous transmission pulses. The azimuth resolution of the ScanSAR image is only determined by the duration of each burst, and each complete synthetic aperture length contains several bursts. For ScanSAR data processing, each sub-swath needs to be processe...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9019G01S13/9056
Inventor 李宁王宇邓云凯张志敏刘亚波龚小冬吴铮张明咪
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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