Maneuvering target high-resolution ISAR sub-aperture fusion imaging method

A technology of maneuvering targets and imaging methods, applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., which can solve problems such as poor imaging quality

Active Publication Date: 2017-03-22
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-resolution ISAR sub-aperture fusion imaging method for maneuvering targets, which can solve the problem of poor imaging quality caused by target maneuverability in large-angle, multi-angle or multi-base ISAR situations, and improve the accuracy of unknown targets. Recognition and Interpretation Capabilities of ISAR Imaging

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  • Maneuvering target high-resolution ISAR sub-aperture fusion imaging method

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[0073] The following combination Figure 1 ~ Figure 4 , to describe preferred embodiments of the present invention in detail.

[0074] Such as figure 1 and figure 2 As shown, it is the high-resolution ISAR sub-aperture fusion imaging method of the maneuvering target described in the present invention, comprising the following steps:

[0075] S1. The radar transmits a chirp signal and receives the echo data by dechirp mode;

[0076] S2. Perform translation compensation on the echo data, and divide the echo data in the form of large-angle observation into multiple sub-aperture echo data; or use sub-angles with multiple viewing angles / multi-base ISAR as sub-aperture echoes data;

[0077] S3. Estimate the target rotation parameters based on the image sharpness maximization method, and estimate the azimuth resolution of each sub-aperture image;

[0078] S4. Using a sparse signal processing method to correct the resolution of each sub-aperture image;

[0079] S5. Perform geom...

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Abstract

The invention relates to a maneuvering target high-resolution ISAR sub-aperture fusion imaging method. The method includes the following steps: S1. a radar transmits a chirp signal and receives echo data in a dechirping mode; S2. Translation compensation is performed on the echo data, dividing the echo data in a large-angle observation form into a plurality of pieces of sub-aperture echo data; or existing sub-angles having a plurality of angles of view/a multi-base ISARs are used as sub-aperture echo data; S3. Target rotation parameters are estimated based on an image sharpening degree maximization method, and the azimuth resolution of each sub-aperture image is estimated; S4. a sparse signal processing method is utilized to correct the resolution of each sub-aperture image; and S5. geometric registration and fusion are performed on each sub-aperture image, thereby realizing high-resolution ISAR sub-aperture fusion imaging. The maneuvering target high-resolution ISAR sub-aperture fusion imaging method provided by the invention can solve the problem of poor imaging quality caused by target maneuverability under the circumstance of a large angle, multiple angles of view or a multi-base ISAR, and improves capabilities of identifying and explaining unknown target ISAR imaging.

Description

technical field [0001] The invention relates to an ISAR (Inverse Synthetic Aperture Radar, Inverse Synthetic Aperture Radar) sub-aperture high-resolution fusion imaging method for a maneuvering target, belonging to the technical field of radar signal processing. Background technique [0002] As an important means of observation in space, air and sea, ISAR can realize the imaging of non-cooperative targets by using the distance and Doppler information of target scattering point echoes, and plays an irreplaceable role in target recognition and classification. With the improvement of motion compensation algorithm and imaging technology, ISAR's 2D reconstruction algorithm for stationary targets has become relatively mature. Within a certain coherent accumulation angle, after translation compensation, the target can be approximated as rotating on the turntable, and the target image can be retrieved by processing along the azimuth direction. [0003] In practical applications, un...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9005G01S13/9064
Inventor 盛佳恋王海涛付朝伟李银伟王平
Owner SHANGHAI RADIO EQUIP RES INST
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