Terahertz-ViSAR-based Imaging of Passive Jamming Objects

FAN Lei; YANG Qi; WANG Hongqiang; YI Jun

doi:10.12000/JR24174

Volume 14 Issue 2

Apr. 2025

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FAN Lei, YANG Qi, WANG Hongqiang, et al. Terahertz-ViSAR-based imaging of passive jamming objects[J]. Journal of Radars, 2025, 14(2): 486–500. doi: 10.12000/JR24174

Citation:

FAN Lei, YANG Qi, WANG Hongqiang, et al. Terahertz-ViSAR-based imaging of passive jamming objects[J]. Journal of Radars, 2025, 14(2): 486–500. doi: 10.12000/JR24174

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Terahertz-ViSAR-based Imaging of Passive Jamming Objects

DOI: 10.12000/JR24174 CSTR: 32380.14.JR24174

College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China

Funds: The National Natural Science Foundation of China (62201591, 62035014), Science and Technology Innovation Program of Hunan Province (2024RC3143)

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Corresponding author: WANG Hongqiang, wanghongqiang@nudt.edu.cn
Received Date: 2024-08-31
Rev Recd Date: 2024-11-10

Available Online: 2024-11-14

Publish Date: 2024-12-06

Abstract

Abstract

Imaging of passive jamming objects has been a hot topic in radar imaging and countermeasures research, which directly affects the detection and recognition capabilities of radar targets. In the microwave band, the long dwell time required to generate a single image with desired azimuthal resolution makes it difficult to directly distinguish passive jamming objects based on imaging results. In addition, there is a lack of time-dimensional resolution. In comparison, terahertz imaging systems require a shorter synthetic aperture to achieve the same azimuthal resolution, making it easier to obtain low-latency, high-resolution, and high-frame-rate imaging results. Hence, terahertz radar has considerable potential in Video Synthetic Aperture Radar (ViSAR) technology. First, the aperture division and imaging resolutions of airborne terahertz ViSAR are briefly analyzed. Subsequently, imaging results and characteristics of stationary passive jamming objects, such as corner reflector arrays and camouflage mats, are explored before and after motion compensation. Further, the phenomenon that camouflage mats with fluctuating grids exhibit roughness in the terahertz band is demonstrated, exhibiting the special scattering characteristics of the terahertz band. Next, considering rotating corner reflectors as an example of moving passive jamming objects, their characteristics regarding suppressive interference are analyzed. Considering that stationary scenes feature similarity under adjacent apertures, rotating corner reflectors can be directly detected by incoherent image subtraction after inter-frame image and amplitude registrations, followed by the extraction of signals of interest and non-parametrical compensation. Currently, few field experiments regarding the imaging of passive jamming objects using terahertz ViSAR are being reported. Airborne field experiments have been performed to effectively demonstrate the high-resolution and high-frame-rate imaging capabilities of terahertz ViSAR

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