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Synthetic aperture radar echo data range cell migration correction method and device

A technology of synthetic aperture radar and echo data, applied in radio wave measurement systems, instruments, etc., can solve the problem of inability to obtain focused SAR images, and achieve good focusing results

Active Publication Date: 2016-05-11
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the above self-focusing method only considers APE, and ignores residual RCM; however, for light and small airborne VHRSAR sensors, residual RCM is inevitable and must be estimated and compensated, otherwise well-focused high quality cannot be obtained SAR image

Method used

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  • Synthetic aperture radar echo data range cell migration correction method and device
  • Synthetic aperture radar echo data range cell migration correction method and device
  • Synthetic aperture radar echo data range cell migration correction method and device

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Embodiment Construction

[0064] In the embodiment of the present invention, distance compression and geometric RCM correction are performed on the echo data to obtain distance-compressed time-domain data; sub-aperture segmentation is performed on the distance-compressed time-domain data to obtain sub-aperture data, and respectively select The sub-block data with the highest signal-to-clutter ratio SCR in each sub-aperture data; according to the selected sub-block data, determine the residual RCM of each sub-aperture data; perform full-aperture combination on the residual RCM of each sub-aperture data to obtain the residual RCM full-aperture combination; correcting the residual RCM of the echo data according to the full-aperture combination of the residual RCM; performing imaging using the echo data corrected for the residual RCM.

[0065] The present invention will be described in further detail below in conjunction with the examples.

[0066] The SAR echo data RCM correction method provided by the em...

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Abstract

The invention discloses a synthetic aperture radar (SAR) echo data range cell migration (RCM) correction method and device. The method includes the following steps that: range compression and geometric RCM correction are performed on echo data, so that post-range compression time-domain data are obtained; sub aperture segmentation is performed on the post-range compression time-domain data, so that sub aperture data can be obtained, and sub block data with a highest signal-to-noise ratio (SCR) in the sub aperture data are selected; the residual RCM of the sub aperture data are determined according to the selected sub block data; full aperture combination is performed on the residual RCM of the sub aperture data, so that the full-aperture combination of the residual RCM can be obtained; the residual RCM of the echo data is corrected according to the full-aperture combination of the residual RCM; and the echo data of which the residual RCM has been corrected are adopted to perform imaging. The invention also discloses a synthetic aperture radar (SAR) echo data range cell migration (RCM) correction device.

Description

technical field [0001] The present invention relates to a synthetic aperture radar (SAR, Synthetic Aperture Radar) echo signal correction technology, in particular to a SAR echo data range migration (RCM, RangeCellMigration) correction method and device. Background technique [0002] SAR has the capability of all-day and all-weather high-resolution imaging, and plays an important role in the field of remote sensing. However, in the airborne SAR system, the motion error mainly caused by the trajectory deviation of the aircraft will cause the range delay and azimuth phase error (APE, AzimuthPhaseErrors) of receiving the original data, which will seriously reduce the quality of the image. In light and small airborne very high resolution (VHR, Very High Resolution) SAR systems, the problems caused by motion errors are more serious: on the one hand, due to light weight and small size, light and small airborne SAR systems are more likely to be affected by atmospheric turbulence. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 李宁王宇邓云凯张志敏周春晖
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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