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Rapid backward projection imaging method based on offline projection

A technology of backward projection and imaging method, which is applied in the direction of radio wave reflection/re-radiation, radio wave measurement system, and utilization of re-radiation, etc. It can solve the problems of large imaging time consumption and high calculation redundancy, and achieve time-consuming imaging. The effect of shortening, reducing the amount of calculation, and reducing the time-consuming imaging

Active Publication Date: 2017-09-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a fast backward projection imaging method based on offline projection, which solves the problem of high computational redundancy and imaging problems of the existing BP method in scenarios where the radar aperture and the geometric relationship of the imaging scene are known. time consuming problem

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Embodiment Construction

[0030] The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

[0031] The method provided by the present invention simplifies the calculation process to coherent superposition of data by making full use of various known distance information in the projection process, thereby greatly reducing the calculation amount and shortening the time-consuming imaging. In this paper, the calculation method using various known distance data is called offline projection. This imaging method can be used directly in fields such as safety inspection or non-destructive testing, and can also be used to indirectly support the configuration design of radar arrays.

[0032] The present invention is based on this understanding. According t...

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Abstract

The invention provides a rapid backward projection imaging method based on offline projection, and a rapid time-domain imaging idea based on an offline projection method is provided aimed at solving the problem that a time-domain algorithm is high is computational complexity and long in time consumption. Aimed at an application scene determined according to the geometric relation of imaging and known in advance, an offline calculation manner is used to calculate and store variables needed in the backward projection algorithm in advance, the flexibility and high precision of the time-domain algorithm are maintained, and in the imaging process, the calculation steps can be reduced substantially and time consumption of imaging is reduced.

Description

technical field [0001] The invention relates to the technical field of radar imaging, in particular to a fast back-projection imaging method based on off-line projection. Background technique [0002] Radar imaging techniques can be divided into time-domain methods and frequency-domain methods. The frequency domain method makes the echo data and the radar image meet the Fourier transform relationship through a series of approximation and compensation processing, and uses the fast Fourier transform to achieve focusing. The use of fast Fourier transform can improve the computational efficiency of frequency domain methods, but this also makes frequency domain methods only applicable to specific observation geometries. Due to the introduction of approximation, frequency-domain methods often lose focus. The time-domain method uses the principle of back projection to directly fill the range image data into the image grid and perform coherent superposition to realize imaging acco...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9017
Inventor 邓彬高敬坤秦玉亮王宏强黎湘
Owner NAT UNIV OF DEFENSE TECH
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