3-D Object Imaging Method With Electromagnetic Vortex

Wang, Jianqiu; Liu, Kang; Liu, Hongyan; Cao, Kaicheng; Cheng, Yongqiang

doi:10.1109/tgrs.2021.3069914

Cited by 33 publications

(11 citation statements)

References 31 publications

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“…High speed movement refers to when the moving distance of the target within the pulse time reaches the wavelength level. This will cause mismatch filtering in the imaging process and the Doppler coupling time shift caused by the intrapulse Doppler term [17], and the azimuth of the target coupled with the OAM modes will also be blurred, which will eventually lead to the deterioration of the imaging result.…”

Section: Introductionmentioning

confidence: 99%

Analysis of high-speed target imaging based on vortex electromagnetic wave

Yang²,

Xie³

et al. 2023

Third International Conference on Computer Vision and Data Mining (ICCVDM 2022)

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The wavefront of Vortex electromagnetic wave (VEMW) is helical in the spatial distribution and different orbital angular momentum (OAM) modes l are orthogonal to each other, which effectively improve the imaging and detection capability of radar. The traditional echo signal "stop and go" hypothesis will produce mismatch filtering and Doppler coupling time shift caused by the intrapulse Doppler term for high-speed targets. In addition, the azimuth of the target coupled with the OAM mode will also be blurred, resulting in deterioration of the imaging quality. For this problem, this paper analyzes the high-speed target imaging based on vortex electromagnetic waves to explore the factors that affect the imaging quality. Firstly, the imaging model for high-speed target is deduced and the echo signal expression is analyzed. On this basis, the phase term formed by the high-speed motion in the echo is analyzed. The simulation results show that the imaging quality is effectively improved after the error phase term obtained from the theoretical analysis is compensated. This work can provide suggestions for subsequent work on vortex imaging of high-speed targets.

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Section: Introductionmentioning

confidence: 99%

Analysis of high-speed target imaging based on vortex electromagnetic wave

Yang²,

Xie³

et al. 2023

Third International Conference on Computer Vision and Data Mining (ICCVDM 2022)

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“…They indicated that compared with the axisymmetric Venturi injector, the streamline in the non-axisymmetric Venturi injector was more stable and the energy loss was less. Wang et al (2022) noted that the injection performance of a non-asymmetric Venturi injector with an arc diffusion section was better than that of a non-asymmetric Venturi injector with a linear diffusion section.…”

Section: Introductionmentioning

confidence: 99%

Structure optimization and fertilizer injection performance analysis of a non‐axisymmetric Venturi injector

Hu,

Guan,

et al. 2023

Irrigation and Drainage

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To improve the fertilizer injection performance of a non‐axisymmetric Venturi injector (NAVI), the effects of the contraction angle, diffusion angle, throat diameter and tilt angle of the injection pipe on the fertilizer injection performance of NAVI were examined. Based on the test, the original NAVI was optimized, and the fertilizer injection performance of NAVI before (F1) and after (F2) optimization was compared. Then, a non‐axisymmetric Venturi injector with arc diffusion (F3) was proposed. The results showed that when the water inlet diameter of the non‐axisymmetric Venturi injector was 25 mm, the optimal structural parameters were as follows: the contraction angle was 40°, the diffusion angle 6°, the throat diameter 7 mm and the tilt angle of the injection pipe was 120°. Compared with F1, the injection rate and fertilizer injection efficiency of F2 increased by 21–66 and 27–79%, respectively. Changing the diffusion section of NAVI into an arc structure was conducive to reducing the vortex area size by 11% and improving the injection rate by 20–62%. The results can provide an important reference for the structural design of Venturi injectors.

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“…Ref. [23] utilizes the relative motion between radar and targets and obtains the 3-D imaging of the targets. Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Refs. [23][24][25][26][27] describe the 3-D imaging of the target using monostatic geometry based on the vortex EM wave, but the 3-D imaging method still needs the aperture in the term of space.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Imaging with Bistatic Vortex Electromagnetic Wave Radar

et al. 2022

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The vortex electromagnetic wave radar based on monostatic geometry can realize the imaging of a radar target in both range dimension and azimuth dimension by adjusting vortex electromagnetic wave modes, but it has no ability to distinguish the elevation of the radar target. To achieve three-dimensional imaging of the radar target, a three-dimensional imaging method of vortex electromagnetic wave based on bistatic geometry is proposed. The echo model of the target based on vortex electromagnetic wave in bistatic geometry is constructed firstly. The elevation resolution of the target is realized, and then the three-dimensional coordinate of the target is reconstructed. Moreover, the elevation resolution and the computational complexity of the proposed method are also analyzed. Simulation results demonstrate the effectiveness of the proposed method. The results also illustrate that the array element requirements and the computational complexity of presented algorithm are less than Multiple Signal Classification (MUSIC) algorithm.

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3-D Object Imaging Method With Electromagnetic Vortex

Cited by 33 publications

References 31 publications

Analysis of high-speed target imaging based on vortex electromagnetic wave

Analysis of high-speed target imaging based on vortex electromagnetic wave

Structure optimization and fertilizer injection performance analysis of a non‐axisymmetric Venturi injector

Three-Dimensional Imaging with Bistatic Vortex Electromagnetic Wave Radar

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