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SAR radar moving object imaging method

A technology of moving targets and imaging methods, applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve problems such as failure

Active Publication Date: 2016-06-22
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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Embodiment Construction

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

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

[0042] Step 1. Obtain the echo data received by the SAR radar, and perform range compression on the echo data to obtain the echo data after the range compression.

[0043] Step 2: Pass the distance-compressed echo data through a low-pass filter to separate clutter data and det...

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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 invention relates to the technical field of radar signal processing, in particular to a SAR radar moving target imaging method, which can improve the traditional WVD transformation parameter estimation requirement for high signal-to-noise ratio, and effectively reduce the influence of overlapping items in the case of multiple targets. The parameters estimated by this patent can finely image moving targets. Background technique [0002] Synthetic Aperture Radar (SAR) has the characteristics of all-weather, all-weather and long-distance imaging, which can effectively improve the radar's information acquisition capabilities. It can be used in civil fields and battlefields such as land monitoring, farmland mapping, ocean observation, sea ice monitoring, and ground deformation observation. There are important applications in military fields such as reconnaissance and military movement monitoring. With the development of SAR, its resolution has gradually imp...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9029
Inventor 王彤杨静裴卓
Owner XIDIAN UNIV
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