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Imaging method for ground-accelerated moving targets in spaceborne SAR based on variable scale algorithm

A technology for accelerated motion and target imaging, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, and measurement devices, and can solve problems such as failure to propose an imaging method, large amount of calculation, and limited scope of application

Inactive Publication Date: 2016-11-30
XIDIAN UNIV
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Problems solved by technology

However, most of these methods have the following two problems: 1) Need to know the target position parameters and motion parameters, or need to perform high-dimensional search for the target parameters, or need interpolation, the calculation amount is very large, and the scope of application is limited; 2) The proposed method is mainly For uniform moving targets, but for ground accelerated moving targets, an accurate imaging method has not been proposed

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  • Imaging method for ground-accelerated moving targets in spaceborne SAR based on variable scale algorithm
  • Imaging method for ground-accelerated moving targets in spaceborne SAR based on variable scale algorithm
  • Imaging method for ground-accelerated moving targets in spaceborne SAR based on variable scale algorithm

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Embodiment Construction

[0070] refer to figure 1 , to further describe in detail the spaceborne SAR ground acceleration moving target imaging method based on the variable scale algorithm of the present invention, and its specific implementation steps are as follows:

[0071] Step 1, perform quadratic equivalent on the instantaneous distance equation of the target, and obtain the target distance equation after quadratic equivalent:

[0072] R ( t a ) = ( v e t a - x e ) 2 + y e 2

[0073] v e = ...

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Abstract

The invention belongs to the field of radar technology, and discloses a method for imaging a spaceborne SAR ground acceleration moving target based on a scale-changing algorithm. Change to the range-Doppler domain; 3) According to the equivalent distance equation, perform complementary RCMC in the range-Doppler domain; 4) Change the signal after the complementary RCMC to the two-dimensional frequency domain; 5) In the two-dimensional Perform range compression and consistent RCMC in the frequency domain; 6) Change the signal after consistent RCMC to the range-Doppler domain; 7) Perform phase correction and azimuth compression in the range-Doppler domain; 8) Perform phase correction and azimuth compression on the The signal undergoes azimuth inverse Fourier transform to complete the imaging of the target. The invention only needs to know the equivalent velocity v e , no high-dimensional search for target parameters is required, and the calculation efficiency is high; the distance migration correction is realized by changing the scale, no interpolation is required, it is convenient for engineering implementation, and the imaging is accurate.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to a method for imaging a ground accelerated moving target of spaceborne SAR based on a scaling algorithm, specifically a method for imaging a ground accelerated moving target based on a scaling algorithm (Chirp Scaling Algorithm, CSA). It is used for spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging of ground acceleration moving targets. Background technique [0002] As an important means of space-based earth observation information acquisition, spaceborne SAR has important application value in earth observation, military reconnaissance, geological resource survey, disaster investigation, ocean observation and environmental monitoring. Since the world's first synthetic aperture radar satellite (the American Seasat satellite) was successfully launched in 1978, spaceborne SAR has gradually attracted the attention of scientific researchers in various countries, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 王彤李永康任倩倩张颖马南
Owner XIDIAN UNIV
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