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Super-resolution linear array three-dimensional synthetic aperture radar imaging method

A technology of synthetic aperture radar and three-dimensional imaging, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., and can solve problems such as not having backscattering characteristics

Inactive Publication Date: 2012-01-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The application of the MUSIC algorithm to linear array SAR has two shortcomings: (1) Due to the working characteristics of imaging radar, radar target imaging is mainly based on single-frame radar image processing
(2) The MUSIC spectrum is constructed using the orthogonality of the subspace, which is a pseudo-spectrum, so it does not have the backscattering characteristics of the target

Method used

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  • Super-resolution linear array three-dimensional synthetic aperture radar imaging method
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  • Super-resolution linear array three-dimensional synthetic aperture radar imaging method

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Embodiment Construction

[0087] The present invention mainly adopts the mode of simulation experiment to verify the feasibility of the system model, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0088] Step 1: Setting of system parameters

[0089] The system parameters adopted in this specific implementation mode are detailed in Figure 4 .

[0090] Step 2: Perform distance compression on the raw data of linear array 3D imaging synthetic aperture radar

[0091] Using the traditional SAR standard range compression method to process the SAR range echo data Compress to obtain the linear array three-dimensional imaging synthetic aperture radar data after distance compression, denoted as Linear Array 3D Imaging Synthetic Aperture Radar Data after Range Compression is a three-dimensional array, including distance dimension, along-track dimension, and cut-track dimension;

[0092] Step 3. Obtain the echo data compressed in step...

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Abstract

The invention discloses a super-resolution linear array three-dimensional synthetic aperture radar imaging method based on an MUSIC (MUltiple SIgnal Classification) algorithm, which comprises the steps of: firstly, compressing distance data by adopting pulse; secondly, focusing scene information by adopting the MUSIC algorithm for each distance section, obtaining reverse scattering information ofa scene point by adopting an LS (Least Square) algorithm; and finally, integrating processed distance sections and displaying to obtain a three-dimensional reconstruction graph. Compared with the traditional imaging methods, such as a BP algorithm and an MF algorithm, the super-resolution linear array three-dimensional synthetic aperture radar imaging method has the advantages of overcoming the problem of Rayleigh limit and limited antenna length, realizing sidelobe weakening by using an MUSIC method while the length of an antenna is not increased, reducing the influence of sidelobe crosstalkto imaging quality, increasing resolution, realizing three-dimensional imaging and improving imaging quality.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, in particular to the technical field of synthetic aperture radar (SAR) imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution microwave imaging system, which relies on the relative motion between the radar and the target to form a synthetic array to obtain horizontal high resolution, and uses large bandwidth signals to achieve vertical high resolution. Three-dimensional SAR is based on the conventional SAR horizontal dimension and longitudinal dimension with an additional tangential horizontal dimension, and it also relies on the relative motion between the radar and the target to obtain the tangential horizontal resolution. [0003] Three-dimensional synthetic aperture radar (SAR) is a new type of synthetic aperture radar technology. Three-dimensional imaging is the characteristic that distinguishes three-dimensional imaging synthetic aperture radar (SA...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/36
Inventor 张晓玲成晨
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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