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Single Bit Synthetic Aperture Radar Imaging Method Based on Block Sparse Iterative Thresholding

A synthetic aperture radar, iterative threshold technology, applied in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve the problems of reducing imaging quality, false targets, etc., and achieve high imaging quality, less noise, and concentrated pixels. Effect

Active Publication Date: 2021-08-17
TSINGHUA UNIV
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Problems solved by technology

One of the problems faced by single-bit imaging is that due to the imbalance of I / Q channels, there are often "false targets" in the image results, which reduces the quality of imaging

Method used

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  • Single Bit Synthetic Aperture Radar Imaging Method Based on Block Sparse Iterative Thresholding
  • Single Bit Synthetic Aperture Radar Imaging Method Based on Block Sparse Iterative Thresholding
  • Single Bit Synthetic Aperture Radar Imaging Method Based on Block Sparse Iterative Thresholding

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Embodiment Construction

[0056] The single-bit synthetic aperture radar imaging method based on block sparse iterative threshold processing proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0057] (1) Divide the imaging area processed by the single-bit synthetic aperture radar into P pixels. The single-bit synthetic aperture radar has M antennas and L frequency points, and the L frequency points are respectively denoted as {f 1 ,..., f l ,..., f L}, the single-bit SAR receives the echo signal y of the area to be imaged at the lth frequency point of the mth antenna m,l :

[0058] the y m，l =∑ i θ i exp(-j2πf l τ i，m )

[0059] where i is the number of the pixel, θ i Indicates the complex scattering intensity at pixel i in the area to be imaged, τ i,m Represents the round-trip time of the electromagnetic wave of the single-bit SAR from the m-th antenna to the i-th pixel, and the above formula is written as the echo signal y in the...

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Abstract

The invention relates to a single-bit synthetic aperture radar imaging method based on block sparse iterative threshold processing, and belongs to the technical field of radar imaging. In the single-bit radar imaging method of the present invention, the joint sparsity between the real part and the imaginary part and the clustering property inside the image are exploited simultaneously. Compared with other existing methods, in the imaging result of the present invention, the background is clearer, the noise is less, the pixels in the target area are more concentrated, and the imaging quality is higher.

Description

technical field [0001] The invention relates to a single-bit synthetic aperture radar imaging method based on block sparse iterative threshold processing, and belongs to the technical field of radar imaging. Background technique [0002] Radar imaging technology has important applications in military, security, disaster assessment, agriculture and other fields. The purpose of radar imaging is to improve the resolution and imaging quality of radar images. The improvement of radar imaging quality is of great help to the improvement of target detection, target recognition, target feature extraction and other capabilities. [0003] Compressed sensing technology is a new signal processing technology emerging in the past ten years. For radar imaging, the advantage of compressed sensing technology is that under the assumption that the scene is sparse, a small amount of observation data can be used to obtain higher quality radar images. In a high-resolution radar image, the imaged...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9004
Inventor 李刚王学谦刘瑜
Owner TSINGHUA UNIV
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