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Inverse synthetic aperture radar imaging data segment selecting method

An inverse synthetic aperture, radar imaging technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problem of inability to determine the length of the imaging data segment at the time of imaging, and avoid imaging blur and resolution. High, well-focused effect

Inactive Publication Date: 2010-09-29
BEIHANG UNIV
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Problems solved by technology

However, the optimal imaging moment and optimal imaging data segment length cannot be determined by this method

Method used

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  • Inverse synthetic aperture radar imaging data segment selecting method
  • Inverse synthetic aperture radar imaging data segment selecting method
  • Inverse synthetic aperture radar imaging data segment selecting method

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Embodiment Construction

[0045] In conjunction with the accompanying drawings, the implementation of the present invention will be described in detail through simulation. figure 2 It is the implementation flowchart of the method of the present invention.

[0046] In order to verify the effectiveness of this method, the echo data of a scattering point is simulated first, and the echo data is used to illustrate the specific selection process of the best imaging data segment. The radar parameters in the simulated echo are: wavelength λ=0.03m, bandwidth B=100MHz, imaging accumulation time T=0.5s, pulse repetition frequency prf=4000Hz. Assuming that the target rotation speed remains constant ω=πrad / s, the initial coordinates of the scattering point are (x 0 ,y0 )=(10,0), the distance between the radar and the target center R=20000m.

[0047] The Doppler frequency prior information of this echo can be known from the Doppler frequency expression (3):

[0048] f d ...

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Abstract

The invention relates to an inverse synthetic aperture radar imaging data segment selecting method. In the method, image contrast is taken as a standard of evaluating image focusing degree, and the optimal imaging data segment selecting method can be simply expressed by a mathematical expression (topt, delta topt)=arg[max(IC)], wherein the topt is the central time of the optimal imaging data segment; the delta topt is the length of the optimal imaging data segment; and the IC is the image contrast; the key for determining the optimal data segment is to calculate the topt and the delta topt from the expression; and the method comprises the following four steps of: 1, generating an ISAR image sequence; 2, calculating image sequence contrast; 3, estimating the central time topt of the optimal data segment; and 4, estimating the length delta topt of the optimal data segment. Images with high resolution and good focusing can be generated according to the optimal data segment.

Description

technical field [0001] The invention relates to an inverse synthetic aperture radar (ISAR) imaging data segment selection method based on image contrast maximization, which belongs to the technical field of radar imaging. Background technique [0002] Radar imaging not only has high resolution, good penetration, and strong anti-interference ability, but also can work around the clock, which can make up for the shortcomings of visible light and infrared imaging technology. ISAR is another radar imaging technology developed on the basis of SAR (Synthetic Aperture Radar), which aims to solve the imaging problem of moving targets. In practical application, besides being fixed on the ground, ISAR can also be installed on moving platforms such as aircrafts and ships to image moving targets in the air, sea or ground, and is used in strategic defense, anti-satellite, tactical weapons and radar astronomy. important application value. [0003] The range-Doppler (R-D) imaging method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
Inventor 郑夙袁运能
Owner BEIHANG UNIV
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