Sliding spotlight mode SAR imaging processing method and device based on frequency modulation removal

A technology of sliding beamforming and frequency modulation, which is applied in the directions of measuring devices, radio wave reflection/reradiation, and utilization of reradiation, 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, the effect of alleviating contradictions

Active Publication Date: 2020-09-08
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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  • Sliding spotlight mode SAR imaging processing method and device based on frequency modulation removal
  • Sliding spotlight mode SAR imaging processing method and device based on frequency modulation removal
  • Sliding spotlight mode SAR imaging processing method and device based on frequency modulation removal

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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 invention relates to a sliding spotlight mode SAR imaging processing method and device based on frequency modulation removal. The method comprises the steps: reducing the azimuth processing bandwidth of an original radar echo signal based on an azimuth demodulating algorithm, and obtaining a primary radar echo signal; performing focusing processing on the primary radar echo signal through a high-order phase Chirp Scaling algorithm to obtain a secondary radar echo signal; using an azimuth Scaling algorithm for carrying out azimuth normalization processing on the secondary radar echo signalto obtain a target radar echo signal, so that the imaging precision of the sliding spotlight mode SAR is improved, and imaging precision and stability of the synthetic aperture radar 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 & AuthorityApplications(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