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Title: DDS-Based Signal-Generation Architecture Comparison for an Imaging Radar at 300 GHz
Authors: Rubio-Cidre, Gorka
Badolato, Alejandro
Úbeda-Medina, Luis
Grajal, Jesús
Mencia-Oliva, Beatriz
Dorta-Naranjo, Blas Pablo 
UNESCO Clasification: 3325 Tecnología de las telecomunicaciones
Keywords: Radar imaging
Phase locked loops
Millimeter wave technology
Phase noise, et al
Issue Date: 2015
Publisher: 0018-9456
Journal: IEEE Transactions on Instrumentation and Measurement 
Abstract: Submillimeter-wave imaging radars for standoff detection require broadband and fast-switch signal-generation architectures in order to achieve a high-range-resolution and near-video-rate imaging system. The signal generation has a strong influence on the radar image quality, primarily due to the transmitted phase noise. Two direct digital synthesis-based architectures for continuous-wave linear-frequency-modulated signal generation have been fabricated and tested for a high-range-resolution imaging radar at 300 GHz for standoff sensing of person-borne concealed threats. In order to select the signal-generation architecture that ensures the proper operation of the imaging radar with a cost-saving objective, three figures of merit have been used: 1) radar image quality; 2) power consumption; and 3) cost. The impact of the signal-generation architectures on the imaging radar indicates that both architectures present a similar radar performance in terms of radar image quality, although the narrowband direct-digital-synthesis/ phase-locked loop scheme is a cost-effective solution compared with the broadband direct-digital-synthesis scheme in order to develop an affordable and energy-efficient high-performance preindustrial radar prototype.
ISSN: 0018-9456
DOI: 10.1109/TIM.2015.2440557
Source: IEEE Transactions on Instrumentation and Measurement[ISSN 0018-9456],v. 64 (7127004), p. 3085-3098
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