Simulation Validation of High Resolution Indoor Terahertz Synthetic Aperture Radar Imaging

Batra, Aman; Wiemeler, Michael; Goehringer, Diana; Kaiser, Thomas

doi:10.23919/eucap48036.2020.9135521

Cited by 9 publications

(11 citation statements)

References 5 publications

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“…The PRF is related to the Doppler bandwidth. The Doppler shift arises because of the continuous motion of the platform [1][2], [28].…”

Section: A Sar System Modelmentioning

confidence: 99%

“…The 2D raw data is further processed with image reconstruction algorithms to generate the image of the illuminated object. In this paper, Range Doppler Algorithm (RDA) and Backprojection Algorithm (BPA) are used for the THz SLAM, where RDA and BPA are frequency domain and time domain image reconstruction algorithms, respectively [1][2], [28]. Let's consider a target located at ( , , 0), where ± ∈ ( − , + ), and ± ∈ (− /2, /2).…”

Section: A Sar System Modelmentioning

confidence: 99%

“…where = 50 GHz corresponds to the = 3 mm and with the squint angle , and the ground range resolution is = / . Furthermore, the azimuth resolution can be defined as = (0.886 )/2 and by using the value of , the resolution can be derived as = /2 and it is independent of platform range and height [1][2], [28], [30]. Furthermore, all the relevant parameters for SAR imaging are summarized in Table. 1.…”

Section: A Slam With Modelled Sar Systemmentioning

confidence: 99%

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Indoor THz SAR Trajectory Deviations Effects and Compensation With Passive Sub-mm Localization System

et al. 2020

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In radar remote sensing, the Terahertz (THz) spectrum is presently being investigated worldwide with focus on short-range indoor and outdoor applications. The spectrum broadens the unmanned aerial vehicle (UAV) based synthetic aperture radar (SAR) applications to indoor room profiling with submm resolution and material characterization as many materials have unique fingerprints at this spectrum. SAR technique requires precise localization information of the mobile radar sensor, which in conventional SAR is achieved using an existing localization infrastructure, such as a global positioning system (GPS) and inertial measurement unit (IMU). For the indoor THz SAR, the GPS does not provide coverage in indoor complex environments, and also the state-of-art compact IMU does not provide the required sub-mm accuracy. These limitations can be overcome by utilizing an indoor localization system. Therefore, this paper presents an indoor THz simultaneous localization and mapping (SLAM) system. The system comprises of passive tags based radio frequency identification (RFID) localization system and SAR that provides the UAV localization and mapping of the in-room objects. Another challenge for the UAV based indoor THz SAR that is addressed in this paper is motion compensation (MOCO). At the THz, MOCO requires special consideration due to very small trajectory deviation is in the range of carrier wavelength. Therefore, to study the effects of the sub-mm translational errors, a testbed has been set up, and measurement results are presented in this paper along with the 3D electromagnetic simulation results for a carrier frequency of 275 GHz and bandwidth of 50 GHz. Further, to compensate these errors, the sub-mm localization system is used and the results are presented to validate the proposed solution for indoor THz SAR MOCO.

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“…The PRF is related to the Doppler bandwidth. The Doppler shift arises because of the continuous motion of the platform [1][2], [28].…”

Section: A Sar System Modelmentioning

confidence: 99%

Section: A Sar System Modelmentioning

confidence: 99%

Section: A Slam With Modelled Sar Systemmentioning

confidence: 99%

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Indoor THz SAR Trajectory Deviations Effects and Compensation With Passive Sub-mm Localization System

et al. 2020

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“…The SAR sensor is composed of the VNA, the extender and the implemented horn antenna, which are mounted on a y-axis positioner with a maximum 2.2 cm positioning range and a sub-µm accuracy. Furthermore, the reference slant range to the scene center from antenna opening of 12 cm is decided because of the maximum aperture length of 2.2 cm with the positioner and the beamwidth [3]. For measurements, the channel's reflection coefficient S11 is recorded for each scanning position.…”

Section: Imaging Geometry and Measurement Setupmentioning

confidence: 99%

“…The SAR operation can be explained as the radar sensors are mounted on a moving platform that radiates EM waves towards the target and backscattered signals are recorded at the sensor [1], [2]. Based on an altitude and moving platform, the SAR system can be characterized as space-borne, air-borne, ground based and indoor SAR [3]. This paper focuses on indoor SAR applications.…”

Section: Introductionmentioning

confidence: 99%

Sub-mm Resolution Indoor THz Range and SAR Imaging of Concealed Object

Batra

Zantah

et al. 2020

2020 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM)

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In radar systems, the frequency range is being extended to high frequencies such as THz for sub-mm resolution. The spectrum offers high resolution but on the contrary, propagation distance and penetration depth are limited because of smaller wavelength. It suffers from higher atmospheric absorption in comparison to sub-GHz systems. In comparison to optical technology, the radar technique majorly benefits with respect to the penetration property such as cloud/smoke cover penetration and detection of concealed objects. However, the THz range and synthetic aperture radar (SAR) imaging of concealed objects are not very well established. Therefore, this paper examines this property at THz. A testbed has been set up with a bandwidth of 110 GHz at a carrier frequency of 275 GHz. The imaging is performed of a very small metal object. Firstly, the sub-mm resolution is validated with the experiment after that the range and SAR imaging are performed in which this object is covered with different types of materials. The backscattered data is processed with the image reconstruction algorithms and the results are presented in this paper with respect to sub-mm resolution and detection.

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Circular Synthetic Aperture Radar for Near-field Terahertz Imaging

Gezimati

Singh

2022

2022 5th International Conference on Multimedia, Signal Processing and Communication Technologies (IMPACT)

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Simulation Validation of High Resolution Indoor Terahertz Synthetic Aperture Radar Imaging

Cited by 9 publications

References 5 publications

Indoor THz SAR Trajectory Deviations Effects and Compensation With Passive Sub-mm Localization System

Indoor THz SAR Trajectory Deviations Effects and Compensation With Passive Sub-mm Localization System

Sub-mm Resolution Indoor THz Range and SAR Imaging of Concealed Object

Circular Synthetic Aperture Radar for Near-field Terahertz Imaging

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