Circular scanning ISAR mode ship super-resolution imaging method

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

Active Publication Date: 2019-01-01
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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  • Circular scanning ISAR mode ship super-resolution imaging method
  • Circular scanning ISAR mode ship super-resolution imaging method
  • Circular scanning ISAR mode ship super-resolution imaging method

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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 sequence number of the current data frame, m=0,...,M-1, t represents the time in azimuth, 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 synthetic aperture, T int ...

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Abstract

The invention discloses a circular scanning ISAR mode ship super-resolution imaging method and belongs to the radar technology field. The method comprises the following steps of dividing an echo signal in a circular scanning ISAR mode into M data frames and carrying out processing frame by frame; for a mth data frame, carrying out distance compression and selecting the sub-echo of the ship targetof a mth frame; pre-processing the sub-echo of the ship target of the mth frame, wherein preprocessing includes translation compensation and rotational compensation; using a Burg algorithm to carry out data extrapolation at an azimuth direction on the sub-echo of the ship target of the mth frame; randomly sampling extrapolated data in the azimuth direction; for the sampled data, carrying out compressed sensing calculation in the azimuth direction to obtain the sparse coefficient matrix of a current data frame; carrying out constant false alarm rate detection on the sparse coefficient matrix after compressed sensing, and acquiring the distance Doppler domain super-resolution image of the mth frame.

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 Applications(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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