<scp>E</scp>xperimental research on vehicle‐borne SAR imaging with THz radar

Yang, Qi; Qin, Yuliang; Zhang, Ke; Deng, Bin; Wang, Xinyun; Wang, Hongqiang

doi:10.1002/mop.30668

Cited by 19 publications

(6 citation statements)

References 8 publications

(7 reference statements)

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“…PGA algorithm has been widely used in the SAR and ISAR field since it was proposed due to its good robustness and fast convergence, and it normally works well even if the vibration parameters cannot be measured. 7 The SAR image after PGA is shown in Figure 5. The focusing degree in azimuth is obviously improved compared with Figure 4B.…”

Section: E H I C L E -B O R N E S a R I M A G I N G P R O C E S Smentioning

confidence: 99%

Experimental research on vehicle‐borne SAR imaging with THz radar

Yang

Qin

Zhang

et al. 2017

Micro & Optical Tech Letters

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Vehicle‐borne SAR is one of the most important applications of radar systems, playing a more and more major role in civilian and military fields. Vehicle‐borne SAR imaging experiments with a 0.22‐THz radar system are introduced in this letter and the imaging processing based on practical problems is presented. High quality imaging results are obtained after a series of processing such as optimum parameters estimation, harmonic interference correction and vibration compensation. Finally, analyses of the imaging results verify the validity of the imaging processing, which provide support to the practical application of terahertz vehicle‐borne SAR imaging systems.

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Section: E H I C L E -B O R N E S a R I M A G I N G P R O C E S Smentioning

confidence: 99%

Experimental research on vehicle‐borne SAR imaging with THz radar

Yang

Qin

Zhang

et al. 2017

Micro & Optical Tech Letters

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“…Complementary to the indoor THz SAR applications, many novel THz SAR testbeds are proposed in the literature in areas such as the automobile [ 11 ], non-destructive testing [ 12 ], and security [ 13 ]. The object recognition serving security purposes is presented in [ 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Object Recognition in High-Resolution Indoor THz SAR Mapped Environment

Batra

Sheikh

Khaliel

et al. 2022

Sensors

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Synthetic aperture radar (SAR) at the terahertz (THz) spectrum has emerging short-range applications. In comparison to the microwave spectrum, the THz spectrum is limited in propagation range but benefits from high spatial resolution. The THz SAR is of significant interest for several applications which necessitate the mapping of indoor environments to support various endeavors such as rescue missions, map-assisted wireless communications, and household robotics. This paper addresses the augmentation of the high-resolution indoor mapped environment for object recognition, which includes detection, localization, and classification. Indoor object recognition is currently dominated by the usage of optical and infrared (IR) systems. However, it is not widely explored by radar technologies due to the limited spatial resolution at the most commonly used microwave frequencies. However, the THz spectrum provides a new paradigm of possible adaptation of object recognition in the radar domain by providing image quality in good compliance to optical/IR systems. In this paper, a multi-object indoor environment is foremost mapped at the THz spectrum ranging from 325 to 500 GHz in order to investigate the imaging in highly scattered environments and accordingly create a foundation for detection, localization, and classification. Furthermore, the extraction and clustering of features of the mapped environment are conducted for object detection and localization. Finally, the classification of detected objects is addressed with a supervised machine learning-based support vector machine (SVM) model.

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“…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]. Compared to the other THz radar systems, the SAR/ISAR system has a relative simple system structure and low hardware cost, and has no limitation of target distance.…”

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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Experimental research on vehicle‐borne SAR imaging with THz radar

Cited by 19 publications

References 8 publications

Experimental research on vehicle‐borne SAR imaging with THz radar

Experimental research on vehicle‐borne SAR imaging with THz radar

Object Recognition in High-Resolution Indoor THz SAR Mapped Environment

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

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