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Multiscale fusion-based synthetic aperture imaging method

A multi-scale fusion and comprehensive aperture technology, which is applied in the direction of radio wave reflection/re-radiation, re-radiation, and measurement devices, can solve the problem of low reconstruction accuracy and achieve the effect of improving accuracy and low cost

Active Publication Date: 2019-09-13
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Among them, the MFFT method effectively improves the imaging accuracy by performing phase compensation on the visibility function, and the inversion speed is fast; but it is only suitable for antenna arrays with standard grid distribution (such as "T" shape, "U" shape)
The Gridding method overcomes this deficiency, but its interpolation and resampling process will introduce additional errors, resulting in lower reconstruction accuracy

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Embodiment Construction

[0055] The technical solution of the present invention will be described in detail below with reference to the drawings and embodiments.

[0056] Such as figure 1 As shown, the element antenna (c,l) is located on the OXY plane, and the spread source target S is located on the oxy plane; after discretizing the target, the i-th radiating source S i The distances to antennas c and l are R respectively i c And R i l .

[0057] According to the interferometric principle of synthetic aperture radiometer, the sample point of the visibility function measured by the antenna pair (c,l) can be expressed as:

[0058]

[0059] Where E # (·) is the electromagnetic signal received by the element antenna, Represents time integration, τ is the integration time, (x i ,y i ) Is S i Coordinates, T(x i ,y i ) Is the normalized brightness temperature, F # (·) is the antenna pattern, k=2π / λ is the number of circular waves, λ is the center wavelength of the system, r c,l Is the de-streaking function. exp[...

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Abstract

The invention discloses a multiscale fusion-based synthetic aperture imaging method. The method comprises the steps of carrying out multiscale detection on a target scene under the premise of not changing the system structure, so as to obtain visibility function sampling values under different scales; combining the obtained multiscale visibility function values into a fused visibility function set, and constructing a multiscale sensing matrix model matched with the fused visibility function set; and carrying out rapid solution on the multiscale sensing model through an FGP method, so as to reconstruct a high-precision millimeter wave image. According to the method, a super-resolution fusion thought is used for reference; and a proposed MsF method is higher in reconstruction precision whenbeing compared with the traditional image fusion method which firstly carries out inversion and then carries out fusion, and is capable of effectively improving the imaging detection precision of thesynthetic aperture radiometers.

Description

Technical field [0001] The invention relates to the field of millimeter wave near-field imaging, in particular to a synthetic aperture imaging method based on multi-scale fusion (MsF). Background technique [0002] Millimeter-wave Synthetic Aperture Radiometer (SAIR) uses synthetic aperture technology to synthesize a large-aperture antenna with a small-aperture array element antenna, which can achieve higher-resolution imaging detection; at the same time, it has the characteristics of infrared and microwave imaging and can penetrate clothing and plastics. It has been widely used in military, navigation, medical and traffic safety supervision fields to realize hidden detection. [0003] At present, limited by the size of the system array, the number of visibility points measured by SAIR is relatively small; and due to the interference of background noise and system errors, the measured visibility function often has errors; the difference between the millimeter wave image reconstruct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9027
Inventor 王凯韩丰恺陈建飞
Owner NANJING UNIV OF POSTS & TELECOMM
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