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A Super-resolution Imaging Method for Vessels in Circular Scanning ISAR Mode

A super-resolution and imaging method technology, applied in the field of radar, can solve the problems of reducing system Doppler resolution and short target accumulation time, and achieve the effect of improving signal-to-noise ratio

Active Publication Date: 2022-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

however, the fast scanning of the antenna also results in a short accumulation time for the target, reducing the system's doppler resolution

Method used

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  • A Super-resolution Imaging Method for Vessels in Circular Scanning ISAR Mode
  • A Super-resolution Imaging Method for Vessels in Circular Scanning ISAR Mode
  • A Super-resolution Imaging Method for Vessels in Circular Scanning ISAR Mode

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Embodiment Construction

[0057] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0058] A method for super-resolution imaging of ships in circular scan ISAR mode, the process of which is as follows figure 1 shown, including the following steps:

[0059] Step 1: Scan the echo signal in the circular sweep ISAR mode, press T frame is a period, divided into M data frames, and processed frame by frame;

[0060] In the circular sweep ISAR mode, the ship echo signal in the azimuth time-distance frequency domain is shown in the formula (1):

[0061]

[0062] Among them, the subscript m is the serial number of the current data frame, m=0,...,M-1, t represents the time in the direction of orientation, f r represents the range frequency, rect(·) is a rectangle function, T frame is the period of the data frame, t m0 is the interval time between the start moment of the mth data frame and the center moment of the ship's syntheti...

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Abstract

The invention discloses a method for super-resolution imaging of ships in a circular-scan ISAR mode, which belongs to the technical field of radar and comprises the following steps: dividing echo signals in the circular-scan ISAR mode into M data frames, and processing them frame by frame; In the mth data frame, the range compression is performed, and the sub-echo of the ship target in the m-th frame is selected; the sub-echo of the ship target in the m-th frame is preprocessed including translation compensation and rotation compensation; using Burg Algorithm, for the sub-echo of the ship target in the m-th frame, data extrapolation is performed in the azimuth direction; the extrapolated data is randomly sampled in the azimuth direction; for the sampled data, the compressed sensing calculation is performed in the azimuth direction to obtain The sparse coefficient matrix of the current data frame; the constant false alarm rate detection is performed on the sparse coefficient matrix after compressed sensing, and the range Doppler domain super-resolution image of the mth frame is obtained.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a super-resolution imaging method for ships in a circular scan ISAR (Inverse Synthetic Aperture Radar, Inverse Synthetic Aperture Radar) mode. Background technique [0002] Circular scan ISAR mode is a new working mode of airborne marine surveillance radar. It ensures a large coverage area of ​​the system through the fast circular scanning of the antenna, and can sequentially detect multiple targets in the coverage area during the antenna scanning process. Imaging can also obtain image sequences of the same target with different viewing angles in the process of multi-frame scanning. But on the other hand, the fast scanning of the antenna results in a short accumulation time of the target, which reduces the Doppler resolution of the system. A method for super-resolution imaging of ships in circular scan ISAR mode combined with data extrapolation and compressed sensing i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 周鹏滕焕超张敏吕伟强戴永寿孙伟峰万勇李立刚曲晓俊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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