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Objective perspective radar imaging method

A radar imaging and target technology, which is applied in the field of target perspective radar imaging, can solve the problems of unusable processing methods and antenna equivalence, and achieve the effects of shortening imaging processing time, saving imaging time, and overcoming inapplicability

Active Publication Date: 2015-10-07
北京理工雷科电子信息技术有限公司
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Problems solved by technology

However, in practical applications, the probe of the wall-penetrating radar is generally very close to the wall, and the thickness of the wall is constant, which makes the target in the radiation near-field area of ​​the antenna. The antenna cannot be simply equivalent to a phase center, so it cannot be used. Far field processing method

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Embodiment Construction

[0043] The invention provides a target see-through radar imaging method, which is suitable for near-field environments such as wall-penetrating radars. The method adopts stepping frequency continuous wave radar, uses electromagnetic field coherent technology instead of far-field signal coherent technology, and combines space two-dimensional synthetic aperture technology to realize detection and high-resolution imaging of small targets; in addition, the present invention uses A fast calculation method greatly saves the time from scanning wall data to imaging, and improves the efficiency of equipment use.

[0044]An example of imaging a scene with a buried cylinder in a homogeneous cement medium is given below. The radar parameters are shown in Table 1, and the physical relationship between the target and the medium is shown in image 3 . The figure indicates that the length of the cylinder is 50mm, the diameter is 3mm, the buried depth is 40mm, the buried position is the cent...

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Abstract

The invention discloses an objective perspective radar imaging method, used for performing near field imaging on an object in a medium. The method comprises: employing a stepped-frequency continuous wave radar as an objective perspective radar to obtain a single frequency point imaging result of the medium in combination with the electromagnetic field coherence and synthetic aperture technique; utilizing compensation phase values to compensate for the single frequency point imaging result, and utilizing the ordering characteristic of entropy expression to find one with a smallest entropy value from compensation result, which is regarded as a truest three-dimensional imaging result; and finding a two-dimensional slice with a smallest entropy value from the truest three-dimensional imaging result, which is regarded as a slice closest to the real objective depth in the medium. The objective perspective radar imaging method can be applied under the near field condition, and realize detection and high resolution imaging of small objects.

Description

technical field [0001] The invention relates to the technical field of target perspective radar imaging. Background technique [0002] Ground Penetrating Radar (GPR) is a non-destructive detection technology that uses electromagnetic waves as a detection method to detect the distribution of underground strata and buried objects from the ground. It is widely used in mine detection, mine prospecting, roadbeds, tunnels, and underground culverts. Road, pipe network non-destructive testing and archaeology and other military and civilian fields. Synthetic aperture imaging is an active microwave coherent imaging technology, which has the characteristics of high spatial resolution and all-weather all-weather operation. [0003] Wall Penetrating Radar (WPR) is a technology that uses electromagnetic waves to detect hidden targets inside the wall from the outside of the wall. And the detection and identification of irregular objects such as bugs. At present, precise positioning and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
CPCG01S13/885G01S13/888
Inventor 刘峰向寅于慧
Owner 北京理工雷科电子信息技术有限公司