Airborne SAR Preprocessing Method Based on Doppler Centroid Estimation

A Doppler centering and preprocessing technology, applied in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve the problems of two-dimensional defocusing and slow processing efficiency of SAR images, and achieve improved imaging processing efficiency, The effect of solving two-dimensional defocusing and reducing the amount of calculation

Active Publication Date: 2022-05-31
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of two-dimensional defocusing of SAR images and slow processing efficiency in existing airborne SAR imaging methods, and propose an airborne SAR preprocessing method based on Doppler centroid estimation

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  • Airborne SAR Preprocessing Method Based on Doppler Centroid Estimation
  • Airborne SAR Preprocessing Method Based on Doppler Centroid Estimation
  • Airborne SAR Preprocessing Method Based on Doppler Centroid Estimation

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[0061] Other steps and parameters are the same as the specific embodiment one.

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[0063]

[0065] Other steps and parameters are the same as the specific embodiment one or two.

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Abstract

An airborne SAR preprocessing method based on Doppler centroid estimation, the invention relates to an airborne SAR preprocessing method. The purpose of the present invention is to solve the problems of two-dimensional defocusing of SAR images and slow processing efficiency in the existing airborne SAR imaging method. The process is: 1. Obtain airborne SAR echo data after distance compression; 2. Initialize the number of sub-data blocks; 3. If k≤K, execute 4; otherwise, execute 10; 4. Obtain sub-data blocks; 5. 1. Solving the conjugate multiplication matrix; 6. Obtaining the correlation function; 7. Obtaining the autocorrelation function; 8. Solving the estimated Doppler frequency of the echo; 9. Making k=k+1 and returning 3; 10. Solving The theoretical value of the Doppler frequency caused by the movement of the SAR platform; 11. Obtain the estimated value of the Doppler frequency caused by the movement of the ISAR platform; 12. Obtain the fitting curve; 13. Obtain the optimal imaging data segment. The invention is used in the field of airborne SAR preprocessing.

Description

Airborne SAR Preprocessing Method Based on Doppler Center Estimation technical field [0001] The present invention relates to an airborne SAR preprocessing method. Background technique [0002] Airborne synthetic aperture radar (SAR) imaging of surface ship targets at sea Domain monitoring field plays an important role. The SAR imaging scene is usually when the radar moves and the target does not move, but when the target is on the surface of the ship. During imaging, the ship target often has translation and swing motion, which makes the image of the ship in the radar image two-dimensional defocus, reducing the The image quality affects the subsequent target classification and recognition accuracy. Airborne SAR imaging algorithm or joint inverse synthetic aperture radar (inverse synthetic aperture radar) proposed at present [0003] aperture radar, ISAR) processing technology can improve the image quality to a certain extent, but these algorithms are all processing sh...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9021G01S13/9064
Inventor 曹蕊王勇
Owner HARBIN INST OF TECH
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