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Synthetic aperture radar imaging method based on L<1/2> regularization

A technology of synthetic aperture radar and imaging method, which is applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the problem of high sampling amount, and achieve the effect of reducing sampling amount and effective imaging

Active Publication Date: 2012-11-21
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However based on L 1 The amount of sampling required for regularized imaging methods is still relatively high

Method used

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  • Synthetic aperture radar imaging method based on L&lt;1/2&gt; regularization
  • Synthetic aperture radar imaging method based on L&lt;1/2&gt; regularization
  • Synthetic aperture radar imaging method based on L&lt;1/2&gt; regularization

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Embodiment Construction

[0049] The present invention is based on L 1 / 2 The regularized synthetic aperture radar imaging method, its radar observation echo model is as follows:

[0050] y=Φx+n (4)

[0051] Where y is the radar observation echo data, x is the backscatter coefficient of the target scene, Ф is the radar system observation matrix, and n is the received thermal noise.

[0052] According to the radar observation echo model, based on L 1 / 2 Regularization, establish the following SAR imaging model

[0053] x * = arg min ( | | y - Φx | | 2 2 + λ | | x | | 1 / 2 1 / 2 ) - - - ( 5 )

[0054] Where x * Is the optimal value of the target, y is the radar observation echo data, x is the backscatter coefficient of the target scene, Ф is the radar system observation matrix, λ is the regularization parameter, and arg min is the minimum calculation formula.

[0055] According to L 1 / 2 Regularization theory, based on L 1 / 2 T...

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Abstract

The invention discloses a synthetic aperture radar imaging method based on L<1 / 2> regularization and relates to a radar two-dimension imaging technology. The synthetic aperture radar imaging method includes the steps of a, establishing a synthetic aperture radar imaging model based on the L<1 / 2> regularization according to a synthetic aperture radar observation model; and b, using an iteration half threshold value algorithm to reconstruct an observation scene backscattering coefficient. Compared with traditional synthetic aperture radar imaging methods, the synthetic aperture radar imaging method is capable of reducing a sampling quantity required by the correct reconstruction of an objective scene and achieving effective imaging of synthetic aperture radar data.

Description

Technical field [0001] The invention relates to the technical field of two-dimensional radar imaging, and is a kind of 1 / 2 Regularized synthetic aperture radar imaging method, imaging processing technology based on modern sparse signal processing methods. Background technique [0002] Synthetic Aperture Radar (SAR), as an active microwave imaging system, has the characteristics of all-weather, all-weather and high-resolution imaging. It has been widely used in many fields of military and national economy, such as military reconnaissance, environmental monitoring, land resource management, etc. With the development of SAR technology, the resolution and surveying bandwidth of radar systems are required to continuously improve, and the bottleneck effect of large data volume is becoming more and more obvious. [0003] The sampling data of traditional SAR imaging is sampled at the Nyquist rate. The Nyquist sampling theorem states that for real signals with limited bandwidth, the sampl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 徐宗本吴一戎洪文张冰尘曾锦山
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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