SAR imaging processing method and device based on defrequency modulation in sliding spotlight mode

A technology of sliding beamforming and frequency modulation, which is applied in the direction of measuring devices, radio wave reflection/re-radiation, instruments, etc., can solve the problem of low imaging accuracy of synthetic aperture radar, solve the phenomenon of time domain aliasing, and improve imaging accuracy and stability, reducing the effect of processing bandwidth

Active Publication Date: 2022-05-20
山东产研卫星信息技术产业研究院有限公司
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Problems solved by technology

[0003] However, the polar coordinate processing method ignores the influence of wavefront bending, and the wavenumber domain algorithm requires a large number of interpolation operations in actual operation. The traditional Chirp Scaling algorithm only considers the quadratic phase factor in azimuth compression, and the frequency scaling algorithm is mainly suitable for narrow observations. With imaging processing, the imaging accuracy of the current synthetic aperture radar is relatively low

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  • SAR imaging processing method and device based on defrequency modulation in sliding spotlight mode
  • SAR imaging processing method and device based on defrequency modulation in sliding spotlight mode
  • SAR imaging processing method and device based on defrequency modulation in sliding spotlight mode

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[0062] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0063] figure 1 It is a flow chart of a method for processing SAR imaging in a sliding spotlight mode based on defrequency modulation provided by an embodiment of the present invention; figure 2 yes figure 1 A detailed flowchart of the individual steps in .

[0064] Such as figure 1 and figure 2 As shown, a method for processing SAR imaging in a sliding spotlight mode based on defrequency modulation in this embodiment includes the following steps:

[006...

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Abstract

The present invention relates to a sliding spotlight mode SAR imaging processing method and device based on de-frequency modulation. The method includes: based on the azimuth de-frequency modulation algorithm, the processing bandwidth of the original radar echo signal in the azimuth direction is reduced, and the primary radar echo signal is obtained; The high-order phase Chirp Scaling algorithm focuses on the primary radar echo signal to obtain the secondary radar echo signal; uses the azimuth direction Scaling algorithm to perform azimuth normalization processing on the secondary radar echo signal to obtain the target radar echo signal, In order to improve the imaging precision of sliding spotlight mode SAR, the precision and stability of synthetic aperture radar imaging are effectively improved.

Description

technical field [0001] The present invention relates to the technical field of imaging processing, in particular to a method and device for SAR imaging processing in sliding spotlight mode based on defrequency modulation. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar, which can obtain high-resolution radar images similar to optical photography under weather conditions with extremely low visibility. The method of data processing synthesizes a radar with a larger equivalent antenna aperture. The spotlight mode is one of the most important working modes of the synthetic aperture radar. In this mode, since the antenna beam is always pointed to a fixed imaging area, the synthetic aperture accumulation time is prolonged, so a very high resolution can be obtained. As the application range of synthetic aperture radar is more and more extensive, the precision of imaging has a very high requirement. At present, in order to improve th...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9052G01S13/9011
Inventor王玉林路兴强贺杰候富城王树森王霁云
Owner山东产研卫星信息技术产业研究院有限公司