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A Stepped Frequency Synthetic Aperture Radar Imaging Method Based on Grid Mismatch

A technology of synthetic aperture radar, imaging method, applied in the direction of reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve problems such as grid mismatch

Active Publication Date: 2022-05-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to solve the grid mismatch problem of traditional stepped frequency synthetic aperture radar (SF-SAR, stepped frequency synthetic aperture radar) under the framework of compressed sensing, the present invention proposes a stepped frequency synthetic aperture radar imaging method based on grid mismatch

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  • A Stepped Frequency Synthetic Aperture Radar Imaging Method Based on Grid Mismatch
  • A Stepped Frequency Synthetic Aperture Radar Imaging Method Based on Grid Mismatch
  • A Stepped Frequency Synthetic Aperture Radar Imaging Method Based on Grid Mismatch

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[0044] The effectiveness of the present invention will be described below in conjunction with the accompanying drawings and simulation examples.

[0045] According to the signal model of the present invention, use Matlab (a kind of computer algorithm language) to carry out simulation verification, and concrete simulation parameter is as follows:

[0046] System parameter setting: During the whole observation process, the radar received a total of 200 pulse trains, of which 50 were randomly selected as echo data. Each burst contains 1024 sub-pulses, from which 64 sub-pulses are randomly selected. The total compression ratio is 0.0156, the signal-to-noise ratio (SNR, signal-to-noise ratio) is 10dB, and the frequency step length Δf is 0.25MHz. The observation scene is divided into a 40×40 grid area with a grid interval of 0.5m in the range direction and a grid interval of 0.56m in the azimuth direction. There are 10 grid-mismatched targets that are not on the grid points in the ...

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Abstract

The invention belongs to the technical field of synthetic aperture radar imaging, and relates to a step-frequency synthetic aperture radar imaging method based on grid mismatch. In order to solve the problem of grid mismatch generated by traditional step frequency synthetic aperture radar under the framework of compressed sensing, the present invention proposes a step frequency synthetic aperture radar imaging method based on grid mismatch. On the basis of the compressed sampling matching pursuit algorithm, the nearest grid point to the target is restored, and the gradient descent method is used to continuously minimize the residual error through iterations, thereby approaching the real target position. The beneficial effect of the invention is that while the number of transmitted pulses is reduced, the mesh mismatch target can be accurately recovered.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar imaging, and relates to a step-frequency synthetic aperture radar imaging method based on grid mismatch. Background technique [0002] Stepped frequency waveforms (SFWs, stepped frequency waveforms) are widely used in wideband synthetic aperture radar systems, and are an important class of high-range high-resolution signals. It transmits a group of inter-pulse carrier frequency stepping, intra-pulse coherently modulated pulse trains, and then equivalently synthesizes a large bandwidth signal to the echo signal to improve the distance resolution. Since the stepped-frequency pulse train contains a series of narrow-band sub-pulses, it usually takes a long time to observe all the sub-pulses, but in practice, the observation time is very limited. [0003] Compressive sensing (CS, compressive sensing), as an emerging signal processing technology, can realize accurate reconstruction of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/34G01S13/90G01S7/41
CPCG01S7/34G01S13/90G01S7/41G01S13/9004
Inventor 宗竹林黄丽梅黄栎冰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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