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High-resolution wide-swath SAR imaging method for ground moving targets

A technology of ground moving target and wide swath, applied in the field of radar, can solve the problems of loss of gain of moving target, unable to suppress blurred component, unable to restrain the spectral component of moving target, etc., and achieve the effect of avoiding huge calculation amount and overcoming the loss of gain.

Inactive Publication Date: 2018-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Yang and Zhang et al. assumed that the spectral component of the moving target is located in the middle of the clutter spectral component, and correctly constrained the spectral component of the moving target as much as possible. Although this method can avoid heavy search operations, when the moving direction of the moving target deviates from the guiding direction, the The method will not be able to correctly constrain the spectral components of the moving target, so that the fuzzy component cannot be suppressed and cause the loss of the moving target gain

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  • High-resolution wide-swath SAR imaging method for ground moving targets
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  • High-resolution wide-swath SAR imaging method for ground moving targets

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[0018] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0019] Step 1: Perform azimuth Fourier transform on the echo signals received by each channel.

[0020] Assume that the SAR system has M receiving channels uniformly distributed along the heading, such as figure 2 As shown, the x-axis is the direction of platform motion velocity, and the y-axis is the direction of slant range. The angle φ between the slant range vector from the radar to the ground target and the zero-Doppler plane is called the cone angle. Without loss of generality, the present invention assumes that the SAR system is front-looking and side-looking imaging. For the azimuth multi-channel high-resolution wide swath SAR system, the received echoes of each channel can be equivalent to the time delay of the received echoes of the reference receiving channel (such as the first channel). In order to ensure a wide-distance survey zone, the SAR system u...

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Abstract

The invention discloses a high-resolution wide-swath SAR ground moving target imaging method based on sparse spatial spectrum estimation, which mainly solves the problem of huge calculation amount or spectral component gain loss introduced by the existing method when estimating the target velocity. The implementation steps of the present invention are: (1) carrying out azimuth Fourier transform to the echo signal; (2) according to the sparse spatial spectrum estimation method, using the echo signal estimation of a certain Doppler unit to obtain the velocity of the moving target; (3) Obtain the unambiguous signal of the target according to the estimated target velocity; (4) perform traditional high-resolution moving target imaging on the unambiguous signal according to the estimated target velocity. The present invention converts the problem of moving target speed estimation into the problem of sparse spatial spectrum estimation, and can accurately estimate and obtain the moving target speed with only a small amount of computation, thus ensuring the accurate reconstruction of the Doppler spectrum of the moving target and realizing high-resolution Wide swath SAR imaging of moving targets.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a high-resolution wide-swath synthetic aperture radar (Synthetic Aperture Radar, SAR) ground moving target imaging method in the technical field of radar imaging. Background technique [0002] Synthetic aperture radar has been widely used in military and civilian fields such as strategic defense and terrain surveying and mapping because of its all-day, all-weather, and long-range imaging capabilities. Among them, using SAR to obtain imaging results of moving targets has become one of the research hotspots of modern radar. [0003] At the same time, it is the pursuit goal of radar imaging technology to realize high resolution and wide swath imaging. However, the traditional spaceborne SAR system is limited by the minimum antenna area, and cannot acquire high-resolution wide swath images at the same time. Combined with digital beamforming technology, the azimuth multi-channel...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S13/58
CPCG01S13/58G01S13/90G01S13/9029
Inventor 杨桃丽淦小健王勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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