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Sparse representation-based doppler beam sharpened imaging method and device

A Doppler beam and sparse representation technology, applied in the field of Doppler beam sharpening imaging methods and devices, can solve problems such as limited coherent accumulation time, limited DBS imaging azimuth resolution, and short dwell time of radar antenna beams. , to achieve the effect of high radar resolution, high practicability and improved resolution

Active Publication Date: 2017-05-24
BEIJING INST OF RADIO MEASUREMENT +1
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Problems solved by technology

However, since the wide-area GMTI mode requires a high data revisit rate and real-time update of scene information, the dwell time of radar antenna waves at a certain azimuth angle is very short, so the coherent accumulation time is very limited, which greatly limits The azimuthal resolution of the DBS imaging

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  • Sparse representation-based doppler beam sharpened imaging method and device
  • Sparse representation-based doppler beam sharpened imaging method and device
  • Sparse representation-based doppler beam sharpened imaging method and device

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Embodiment Construction

[0051] Such as Figure 1 to Figure 6 As shown, a kind of Doppler beam sharpening imaging method based on sparse representation provided by the present invention comprises the following steps:

[0052] Step S10: Perform matched filter processing on the echo signals received by the airborne radar in the range direction, and perform range migration correction on the matched filter processed data;

[0053] Step S20: Perform correlation function processing on the data after distance migration correction, and perform average calculation on the processed data to obtain the Doppler center value, and calculate the distance migration correction according to the Doppler center value Doppler center compensation is performed on the data to obtain Doppler center compensation data;

[0054] Step S30: performing DBS imaging on the Doppler center compensation data, and calculating the noise power level;

[0055] Step S40: Construct an over-complete sparse dictionary according to the Doppler ...

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Abstract

The invention discloses a sparse representation-based doppler beam sharpened imaging method and device. The method comprises the following steps of carrying out matched filtering processing on an echo signal received in a range direction, carrying out range migration correction on the processed data; carrying out related function method processing on the data subjected to range migration correction and determining a mean value to obtain a doppler center value; carrying out doppler center compensation on the data subjected to range migration correction to obtain doppler center compensation data; carrying out DBS imaging on the doppler center compensation data and calculating the noise power level; constructing a hypercomplete sparse dictionary according to a doppler frequency resolution and carrying out sparse recovery on the doppler center compensation data; and extracting data corresponding to a doppler bandwidth from the sparse data in a range doppler domain by adopting a linear interpolation method, converting the extracted data into a geodetic coordinate by taking a first group of data as a criterion and sequentially splicing the extracted data until obtaining a wide-area monitoring image. The method has a relatively high transverse resolution.

Description

technical field [0001] The invention relates to the technical field of airborne radar imaging, in particular to a Doppler beam sharpening imaging method and device based on sparse representation, which are suitable for wide-area surveillance, ground reconnaissance and attack, terrain surveying and mapping, and ocean search. Background technique [0002] Synthetic Aperture Radar (SAR) obtains high azimuth resolution by observing the ground scene for a long time. However, since the antenna beam is usually fixed in this system, it is impossible to perform imaging surveillance on long-distance and large-scale ground scenes. For this reason, many experts and scholars at home and abroad have proposed Wide-area Moving Target Indication (Wide-area GMTI, Wide-area Ground Moving Target Indication). Fast imaging of scenes. When using the Wide-area GMTI mode for wide-area surveillance, Doppler Beam Sharpening (DBS, Doppler Beam Sharpening) technology is usually used to obtain a large-...

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Application Information

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IPC IPC(8): G01S13/89G01S7/41
CPCG01S7/41G01S13/89
Inventor 陈洪猛鲁耀兵穆贺强易晓丽刘京
Owner BEIJING INST OF RADIO MEASUREMENT
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