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A SAR radar moving target imaging method

A technology of moving targets and imaging methods, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, and measurement devices, which can solve problems such as failure, and achieve the effect of high multi-target resolution performance and excellent detection performance

Active Publication Date: 2017-12-22
XIDIAN UNIV
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Problems solved by technology

At the same time, WVD transformation is only applicable in the case of high SNR, and fails in the case of low SNR

Method used

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  • A SAR radar moving target imaging method
  • A SAR radar moving target imaging method

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] Embodiments of the present invention provide a SAR radar moving target imaging method, such as figure 1 As shown, the method includes the following steps:

[0042] In step 1, the echo data received by the SAR radar is obtained, and the echo data is compressed in the range direction to obtain the echo data after range compression.

[0043] Step 2, passing the range-compressed echo data through a low-pass filter to separate clutter data and detectable da...

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Abstract

The invention belongs to the field of radar signal processing, and discloses an SAR radar moving object imaging method. The SAR radar moving object imaging method comprises the steps of acquiring echo data which are received by an SAR radar, performing distance direction compression on the echo data, making the echo data after distance direction compression pass through a low pass filter, and separating clutter data and detachable data in the echo data after distance direction compression; forming a ground scene picture from the clutter data; performing moving object parameter estimation on the detachable data, obtaining a Doppler central frequency estimated value and a Doppler chirp rate estimated value, and constructing a reference function according to the Doppler central frequency estimated value and the Doppler chirp rate estimated value; performing time domain multiplication or frequency domain convolution on the reference function and the detachable data, thereby obtaining a moving object imaging picture; and adding the ground scene picture with the moving object imaging picture, thereby obtaining an SAR radar moving object imaging result. The SAR radar moving object imaging method can be used for performing fine imaging on the moving object.

Description

technical field [0001] The present invention relates to the technical field of radar signal processing, in particular to a SAR radar moving target imaging method, which can improve the requirement of high signal-to-noise ratio for traditional WVD transformation parameter estimation, and effectively reduce the influence of overlapping items in the case of multiple targets. The parameters estimated in this patent can finely image moving targets. Background technique [0002] Synthetic Aperture Radar (SAR) has the characteristics of all-weather, all-time and long-distance imaging, which can effectively improve the radar's information acquisition ability. It has important applications in military fields such as reconnaissance and military movement monitoring. With the development of SAR, its resolution is gradually improved, the images of ground objects in SAR images are getting clearer and the image quality is getting higher and higher. People have been exploring applications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9029
Inventor 王彤杨静裴卓
Owner XIDIAN UNIV
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