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Radar video imaging method based on no-interpolation fusion fast back-projection

A technology of backward projection and imaging method, applied in the direction of reflection/re-radiation of radio waves, radio wave measurement system, utilization of re-radiation, etc. It can improve the image quality, high computing efficiency and high imaging efficiency.

Active Publication Date: 2018-06-26
XIDIAN UNIV +1
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Problems solved by technology

However, the frame rate and data rate of video SAR are high, and the requirements for system hardware are relatively high, which limits the development and application of video SAR to a certain extent.

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  • Radar video imaging method based on no-interpolation fusion fast back-projection

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] Due to the high frame rate of video SAR, the data of two adjacent images have a high overlap rate. In general, the higher the frame rate, the higher the overlap rate. When video imaging, first divide the data into data blocks according to the requirements of azimuth resolution, such as figure 1 shown.

[0027] refer to figure 2 It is the flow chart of the FFBP (fast back projection) fast imaging method based on no interpolation fusion of the present...

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Abstract

The invention belongs to the technical field of synthetic aperture imaging and discloses a radar video imaging method based on no-interpolation fusion fast back-projection. First data is subjected tosubaperture division through an FFBP algorithm, and then each subaperture data forms a local rectangular coordinate aperture image with the center of the subaperture as the origin. The subaperture image only utilizes partial aperture data and thus is characterized by having a low azimuth resolution. Every two formed subaperture images are merged to obtain a new higher-resolution sub-image, and theprocess is performed in an iterative manner until a fully resolved polar coordinate image is obtained, and finally the polar coordinate image is interpolated to a rectangular coordinate grid to obtain a final image.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture imaging, in particular to a radar video imaging method based on fast back projection without interpolation fusion, which is a method for fast video imaging using synthetic aperture technology. Background technique [0002] Synthetic Aperture Radar (SAR), as a microwave active imaging system, has the characteristics of all-day and all-weather work. According to the principle of synthetic aperture, it coherently accumulates the echo signals collected by the carrier aircraft in different azimuth positions to form a "synthetic array", so as to obtain high resolution in azimuth. Since SAR imaging is not limited by meteorological conditions, and can provide high-resolution earth observation images regardless of day or night, it has broad application prospects in many fields of military, scientific research, and national economy. [0003] At present, all countries are exploring new developmen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9005G01S13/9017
Inventor 丁金闪梁毅王天鹤张玉洪
Owner XIDIAN UNIV
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