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Method for automatically searching point of synthetic aperture radar dot-matrix target image data

A synthetic aperture radar and target image technology, applied in the field of signal processing, can solve the problems of difficulty in distinguishing point targets and uneven distribution of intensity of point targets, reducing workload, overcoming the non-uniform characteristics of point target amplitudes, and achieving high point finding accuracy Effect

Inactive Publication Date: 2013-05-08
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

The antenna pattern and the received power of the radar make the intensity distribution of the point target in the SAR image data uneven, which will cause the energy of the side lobe of the high-intensity point target to exceed the main lobe of the weak-intensity point target, which further makes it difficult to distinguish the point target

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  • Method for automatically searching point of synthetic aperture radar dot-matrix target image data
  • Method for automatically searching point of synthetic aperture radar dot-matrix target image data
  • Method for automatically searching point of synthetic aperture radar dot-matrix target image data

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Embodiment

[0098] Table 1 Radar parameters

[0099]

[0100] According to the radar parameters given in Table 1, the complex data size of the original SAR image is 8192×16384 complex matrix, the matrix has a total of 8192 sampling points in the azimuth direction and 16384 sampling points in the range direction, and the complex matrix is ​​recorded as

[0101]

[0102] Step 1: Antenna pattern weight correction;

[0103] Obtain the slant distance R corresponding to each range gate j (j=1, 2, 3...16384) j :

[0104] R j = 7071.068 + ( j - 1 ) · 3 × 10 8 2 × 400 × 10 6 ...

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Abstract

The invention discloses a method for automatically searching a point of synthetic aperture radar dot-matrix target image data. The method comprises the following steps of: 1, correcting an antenna directional diagram weighing factor; 2, correcting radar receiving power; 3, searching a bidimensional maximum value; 4, positioning a pixel position of a point target; 5, checking the position; and 6, performing bidimensional frequency domain interpolation, and positioning a precise position of the point target. Automatic point search for the synthetic aperture radar dot-matrix target image data isrealized, so that the working quantity of manual point search operation is reduced; the non-uniformity of the amplitude of the point target caused by reasons, such as antenna weighing, is overcome; the point search accuracy is high; the precise position of a dot-matrix target in the synthetic aperture radar image data can be obtained, and is used for precisely positioning a calibrator; the positioning precision of the target position is adjusted by controlling the interpolation magnification; automatic estimation for the dot-matrix target in the synthetic aperture radar image data is realized; an average performance index of the image data is obtained; and an actual performance index of a system can be reflected.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to an automatic point-seeking method for synthetic aperture radar lattice target image data. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-day, all-weather active information acquisition system. The SAR system obtains SAR original echo data by controlling the pulse transmission and reception methods. The data along the flight direction of the carrier is the azimuth direction, and the direction perpendicular to the azimuth direction is the distance direction. Visible radar images are obtained through data processing of SAR raw echo data. [0003] Unlike optical images, typical point targets in SAR image data are not simple impulse functions. A point target appears as a broad main lobe accompanied by a large number of side lobes around it. Sun Bing et al. applied for a patent "A Point Target Resolution Evaluation Method for Squint SAR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 李洲于泽李春升
Owner BEIHANG UNIV
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