3D Imaging Millimeter Wave Circular Synthetic Aperture Radar

Zhang, Renyuan; Cao, Siyang

doi:10.3390/s17061419

Cited by 14 publications

(10 citation statements)

References 46 publications

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“…For broadband signal, the matched filtering (MF) method will need a high sampling rate to satisfy the Nyquist sampling criterion [ 28 ], which will increase the data size remarkably. The bandpass sampling technique is able to overcome this difficulty [ 29 ].…”

Section: Casas Systemmentioning

confidence: 99%

“…The density of the CASAS line array cannot satisfy the half-wavelength spacing condition, which cannot avoid the grating lobes. This makes the Fourier-based signal processing invalid [ 28 ]. Since there are limited dominated scattering centers in the height direction, the sparse reconstruction method can provide a solution to recover the scattering coefficient distribution [ 30 , 31 ].…”

Section: Casas Three-dimensional Image Processingmentioning

confidence: 99%

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Three-Dimensional Imaging of Circular Array Synthetic Aperture Sonar for Unmanned Surface Vehicle

Sai

Fan

2022

Sensors

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Synthetic aperture sonar (SAS) and interferometric synthetic aperture sonar (InSAS) have a range layover phenomenon during underwater observation, the AUV-mounted circular synthetic aperture sonar (CSAS) system, that insonifies targets using multiple circular scans that vary in height and can eliminate the layover phenomenon. However, this observation method is time-consuming and difficult to compensate. To solve this problem, the circular array synthetic aperture sonar (CASAS) based on the equivalent phase center was established for unmanned surface vehicles. Corresponding to the echo signal model of circular array synthetic aperture sonar, a novel three-dimensional imaging algorithm was derived. Firstly, the echo datacube was processed by signal calibration with near-field to far-field transformation and grid interpolation. Then, the sparse recover method was adopted to achieve the scattering coefficient in the height direction by sparse Bayesian learning. Thirdly, the Fourier slice theorem was adopted to obtain the 2D image of the ground plane. After the reconstruction of all height slice cells was accomplished, the final 3D image was obtained. Numerical simulations and experiments using the USV-mounted CASAS system were performed. The imaging results verify the effectiveness of the 3D imaging algorithm for the proposed model and validate the feasibility of CASAS applied in underwater target imaging and detection.

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Section: Casas Systemmentioning

confidence: 99%

Section: Casas Three-dimensional Image Processingmentioning

confidence: 99%

Three-Dimensional Imaging of Circular Array Synthetic Aperture Sonar for Unmanned Surface Vehicle

Sai

Fan

2022

Sensors

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“…Finally, arc segments are reconstructed at any angle, and the imaged object could be viewed from any aspect angle. Alternatively, eight overlapping 90 degrees 3D images are added to form a single 3D image [27], [72].…”

Section: B Digital Focusing In Monostatic Arraymentioning

confidence: 99%

Review of Active Millimeter Wave Imaging Techniques for Personnel Security Screening

Wang

Cui

2019

IEEE Access

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This paper reviews recent progress of active millimeter wave (mmW) imaging techniques for personnel security screening. With the ability to penetrate clothing and the promised millimeter scale spatial resolution, mmW imaging has been widely pursued for personnel surveillance without the usual concern for radiation safety. A brief development history of mmW imaging is introduced. An overview of imaging research and developmental achievements, along with antenna considerations based on quasi-optical geometry, phased reflector array, monostatic array, and multistatic array, is provided. Design considerations related to practical applications, including system calibrations, walk-through system (WTS), portable system, and compressive sensing (CS), are also discussed. INDEX TERMSMillimeter wave imaging, personnel security screening, review.

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“…Radar plays an important role in both civil and military fields as its all-weather and day-night capacities superior to the optical sensors [1][2][3][4]. To protect the targets of interest (TOI) from being detected by the radar, radar jamming techniques have been widely studied over the past few decades, including blanket jamming and deception jamming.…”

Section: Introductionmentioning

confidence: 99%

Improved ISRJ-Based Radar Target Echo Cancellation Using Frequency Shifting Modulation

Zhao

Wang

et al. 2019

Electronics

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Target echo cancellation is an ingenious method that protects the target of interest (TOI) from being detected by radar. Interrupted-sampling repeater jamming (ISRJ) is a novel deception jamming method for linear frequency modulation (LFM) radar countermeasures, which has been applied in target echo cancellation recently. Compared with the conventional cancellation method, not only can the target echo be successfully cancelled at radar receiver, but a train of false targets is also produced and forms deception jamming by applying the ISRJ technique. In this paper, an improved radar target echo cancellation method based on ISRJ is proposed that utilizes an extra frequency shifting modulation on the intercepted LFM radar signal. The jammer power is more efficiently utilized by the proposed method. Moreover, more flexible multi-false-target deception jamming can be obtained by adjusting the interrupted sampling frequency. The real target remains effectively protected by the false preceding target in the presence of amplitude mismatch of cancellation signal and target echo. Numerical simulations and measured data experiments are conducted to demonstrate the effectiveness of the proposed method.

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3D Imaging Millimeter Wave Circular Synthetic Aperture Radar

Cited by 14 publications

References 46 publications

Three-Dimensional Imaging of Circular Array Synthetic Aperture Sonar for Unmanned Surface Vehicle

Three-Dimensional Imaging of Circular Array Synthetic Aperture Sonar for Unmanned Surface Vehicle

Review of Active Millimeter Wave Imaging Techniques for Personnel Security Screening

Improved ISRJ-Based Radar Target Echo Cancellation Using Frequency Shifting Modulation

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