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Cylindrical scanning microwave imaging method

A microwave imaging and cylindrical technology, which is applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve the problems of inability to long-distance imaging, slow imaging speed, and difficulty in practical use, and achieve better imaging results. , easy to obtain, good application prospects

Active Publication Date: 2022-07-29
SUZHOU WEIMO ELECTRONIC INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Large amount of computation, high cost, and slow imaging speed
[0005] The existing digital holographic imaging technology requires two operations of fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) in sequence ("FFT-phase compensation-IFFT" operation), and the amount of calculation is huge. The configuration requirements of the hardware environment and computing resources are high, resulting in high hardware prices and operating costs. In addition, due to the need to perform FFT and IFFT operations twice in sequence, the imaging speed is relatively slow
[0006] 2) It can only be used for near-field imaging, not for long-distance imaging
However, although the existing holographic imaging technology can also realize cylindrical scanning imaging, the imaging method is often very complicated, the hardware cost is high, the imaging speed is slow, and different technologies are required for passive imaging and active imaging, and the mutual compatibility is poor. , which increases the difficulty for actual use, and most of the existing methods are not suitable for large-angle imaging application scenarios. When the target deviates from the normal direction of the array at a large angle, the imaging effect becomes poor. At this time, the resolution is low and satisfactory Therefore, it is of great application value to develop a cylindrical scanning imaging method with good compatibility, excellent imaging effect, wider application range and faster imaging speed.

Method used

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  • Cylindrical scanning microwave imaging method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Embodiment 1: A cylindrical scanning microwave imaging method (see attached Figure 1-2 ), this method is based on the principle of lens imaging, combined with the electromagnetic field theory, according to the target signal received by the antenna array, through the amplitude and phase weighting of the unit signal, using an efficient parallel algorithm to obtain the image field distribution corresponding to the target, the specific algorithm is as follows:

[0142]

[0143] Where: j is the imaginary unit, e is Euler's constant, is the image field distribution, is the target signal received by the array unit, A mn is the amplitude weighting coefficient of the array unit, is the weighted value of the cylinder scan amplitude, is the focusing phase weighting coefficient, is the phase compensation coefficient for cylindrical scanning, is the scanning phase weighting coefficient, M is the number of array elements in the x direction, N is the number of array ele...

Embodiment 2

[0197] Example 2: The effect verification test of this imaging method (the method of Example 1) for passive imaging

[0198] Test conditions: The working frequency is 30GHz, the antenna unit spacing is λ / 4 during scanning, the array scale is 66*66, one target is located in the normal direction of the array, the other two targets are deviated from the normal direction at a certain angle, and the scanning cylinder is centered on the target , the radius is 1m, and the imaging results are shown in the attached image 3 .

Embodiment 3

[0199] Example 3: The effect verification test of the imaging method (the method of Example 1) for active holographic imaging

[0200] Test conditions: The operating frequency is 30GHz, the antenna unit spacing is λ / 4, the array size is 66*66, one target is located in the normal direction of the array, the other target is deviated from the normal direction by 30°, and the other two targets are deviated from the normal direction by a certain angle. , the scanning cylinder is centered on the target and the radius is 1m. The imaging results are shown in the appendix Figure 4 .

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Abstract

The invention relates to the technical fields of optical imaging, microwave imaging, radar detection, sonar, ultrasonic imaging, and target detection, imaging recognition, and wireless communication based on media such as sound, light, electricity, etc., and in particular to a cylindrical scanning microwave imaging method and the above applications in various fields. By adopting the method of the present invention, the passive imaging technology can be used to realize the ultra-fast scanning of the target, and when a suspect object is found, the active imaging technology can be used to observe the details of the object in detail, and the two imaging methods can share a set of signal processing systems, thereby The hardware cost is greatly reduced, the imaging speed is improved, and the practical application is greatly facilitated. At the same time, the method of the present invention is also suitable for imaging systems in which the antenna does not move and the target rotates, such as turntable imaging. In addition, the method of the present invention also has the advantages of good compatibility, small calculation amount, good imaging effect, wide application range and the like.

Description

technical field [0001] The invention relates to the technical fields of optical imaging, microwave imaging, radar detection, sonar, ultrasonic imaging, and target detection, imaging recognition, and wireless communication based on media such as sound, light, electricity, etc., and in particular to a cylindrical scanning microwave imaging method and the above applications in various fields. Background technique [0002] Digital holographic imaging technology evolved from laser holographic imaging technology, with high imaging resolution, is currently one of the preferred technologies for millimeter-wave active imaging, and related products have been promoted and applied in different fields at home and abroad. [0003] However, traditional digital holographic imaging technology still has many defects and deficiencies, mainly including: [0004] 1) Large amount of computation, high cost and slow imaging speed [0005] The existing digital holographic imaging technology needs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 张继龙张鑫张继康俞晓琳宋雨花张艺恒
Owner SUZHOU WEIMO ELECTRONIC INFORMATION TECH CO LTD