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Grid mismatch-based stepped frequency synthetic aperture radar imaging method

A technology of synthetic aperture radar and imaging method, which is applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve problems such as grid mismatch, achieve accurate recovery, and reduce the number of transmitted pulses

Active Publication Date: 2019-11-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

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

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  • Grid mismatch-based stepped frequency synthetic aperture radar imaging method
  • Grid mismatch-based stepped frequency synthetic aperture radar imaging method
  • Grid mismatch-based stepped frequency synthetic aperture radar imaging method

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Embodiment Construction

[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, 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 △f 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 scen...

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Abstract

The invention belongs to the technical field of synthetic aperture radar imaging and relates to a grid mismatch-based stepped frequency synthetic aperture radar imaging method. The invention aims to solve a grid mismatch problem caused by a traditional stepped frequency synthetic aperture radar under a compressed sensing framework. On the basis of a compressed sampling matching pursuit algorithm,a grid point closest to a target is recovered; and on the basis of a gradient descent method, a residual error is continuously minimized through iteration, so that the grid point can be approximate tothe position of the real target. With the method of the invention adopted, a grid mismatch target can be accurately recovered while the number of emission pulses is reduced.

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. Because 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 o...

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Application Information

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Patent Type & Authority Applications(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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