ViSAR: A 235 GHz radar for airborne applications

Kim, Seong-Hwoon; Fan, Ryan; Dominski, Fred

doi:10.1109/radar.2018.8378797

Cited by 63 publications

(23 citation statements)

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“…The wide band and high power at millimeter waves permit high resolution and stand-off imaging. A novel application where TWTs are pivotal is the ViSAR (Video Synthetic Aperture Radar) at 235 GHz [14]. It is able to penetrate clouds and works in all-weather conditions providing high resolution imaging.…”

Section: Twt Applicationsmentioning

confidence: 99%

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Millimeter wave traveling wave tubes for the 21st Century

Paoloni

Gamzina

Letizia

et al. 2020

Journal of Electromagnetic Waves and Applications

118

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Section: Twt Applicationsmentioning

confidence: 99%

“…It is able to penetrate clouds and works in all-weather conditions providing high resolution imaging. A TWT with 50 W of average power at long duty cycles across the entire band of operation is used [14].…”

Section: Twt Applicationsmentioning

confidence: 99%

Millimeter wave traveling wave tubes for the 21st Century

Paoloni

Gamzina

Letizia

et al. 2020

Journal of Electromagnetic Waves and Applications

118

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“…The program aims to achieve moving targets tracking and imaging with video frame rate. They have carried out the ViSAR experiments with a 0.235 THz one-input four-output system, and obtained the real-time high-resolution SAR image of moving targets [23]. Beside the above two forerunners, other organizations also started to develop SAR/ISAR systems and many remarkable achievements had been made [5,24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Interferometric Inverse Synthetic Aperture Radar Imaging with Multi-Channel Terahertz Radar System

Zhang

Yang

Deng

et al. 2019

Sensors

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The all solid-state terahertz (THz) radar has obvious miniaturized integration and high resolution imaging advantages compared with conventional microwave radar. In this paper, a 0.22 THz active frequency-modulated pulse radar system with one transmission channel and four receiving channels is presented, and interferometric inverse synthetic aperture radar (InISAR) imaging experiments, which can acquire altitude information of objects, are carried out. In order to acquire high-quality InISAR images, a calibration method is presented to solve the nonlinearity of wideband signal frequency and phase inconsistency of different receiving channels together. Furthermore, to deal with the phase wrapping in InISAR imaging of objects with large scale, a novel method based on the dominant scatterers to estimate the objects rotation rate is presented. Finally, to show more information of objects in the InISAR images, the imaging results with a large rotation angle by the convolutional back-projection algorithm are obtained. The imaging results verify the superior performance of the multi-channel THz radar system and the imaging processing method, which can provide support for further research on InISAR imaging in the THz band.

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“…Video SAR (ViSAR) is a SAR imaging mode that continuously generates SAR video frames at a higher frame rate than those of conventional SAR systems for a certain period of time in a fixed area of interest, in the spotlight mode, and in a linear or circular flight path. ViSAR generates SAR video using the back‐projection algorithm (BPA), typically at low transmission frequencies, such as the X‐band. MIMO ViSAR refers to, in this article, a kind of video SAR mode or system using MIMO technology to improve various performance aspects of conventional ViSAR.…”

Section: Introductionmentioning

confidence: 99%

SAR raw data simulation for multiple‐input multiple‐output video synthetic aperture radar using beat frequency division frequency modulated continuous wave

Kim

2019

Micro & Optical Tech Letters

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Synthetic aperture radar (SAR) raw data simulation, operating under various scenarios, and realistic environments, are necessary for analyzing and verifying the performance aspects of SAR systems and the various algorithms used in them. In this article, we propose a method to simulate the raw data generated by multiple‐input multiple‐output video synthetic aperture radar (MIMO ViSAR) from a speckled scene, using beat frequency division (BFD) frequency‐modulated continuous wave (FMCW). Using an optical image as a reflectivity map for a realistic scene, we first multiply a speckle noise with this image to generate a speckled reflectivity map. We then compute the two‐dimensional convolutions of a SAR point spread function of a MIMO ViSAR system with the speckled reflectivity map to generate a complex SAR image. Finally, the SAR raw data is generated through inverse processing of the MIMO ViSAR system. We use the synthesized raw data to reconstruct SAR images, based on our previously proposed MIMO ViSAR signal‐processing algorithm, to demonstrate and verify the effectiveness of the proposed method.

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ViSAR: A 235 GHz radar for airborne applications

Cited by 63 publications

References 1 publication

Millimeter wave traveling wave tubes for the 21st Century

Millimeter wave traveling wave tubes for the 21st Century

Experimental Research on Interferometric Inverse Synthetic Aperture Radar Imaging with Multi-Channel Terahertz Radar System

SAR raw data simulation for multiple‐input multiple‐output video synthetic aperture radar using beat frequency division frequency modulated continuous wave

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