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Browsing by Author "Reis, Joao R."

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  • Disruptive Future of Radar Based on All-Digital PN Signal Processing
    Publication . Ribeiro, Carlos; Ferreira Gil, João; Caldeirinha, Rafael; Reis, Joao R.; Sardo, Andre; Duarte, Luis; Leonor, Nuno
    This paper presents the first results on the design and implementation of a real-time and high resolution monostatic radar at 24 GHz, based on the sliding correlation of pseudonoise (PN) sequences. The real-time radar, with a high time resolution better than 4ns, is used for moving target identification (MTI) in the presence of highly dense clutter, under harsh environments and severe weather conditions (fog, snow and fire smoke or plume). A radar signal processing based on alldigital PN sequences is proposed, which represents a quantum leap in radar future front-end architecture. Results obtained in a controlled environment, inside an anechoic chamber, are presented and a benchmark with a commercially-of-the-shelf solution is presented. © 2019 IEEE.
    2019-09Journal article Open access Show more
  • Measurements and Modelling of Spatial Diversity using 2D Transmitarray
    Publication . Reis, Joao R.; Hammoudeh, Akram; Copner, Nigel; Caldeirinha, Rafael
    This paper disseminates the results of the first experimental trials on Spatial Diversity (SD) with beamsteering capabilities by the means of 2D transmitarray and thus reduced RF chains. The SD arrangement is composed of a dual antenna configuration in which beamsteering is activated by using electronically reconfigurable transmitarray (eRT) in front of the two single directive antennas. The experimental radiation patterns obtained at 5.2 GHz proves the usefulness of the concept.
    2018-09Conference paper Restricted access Show more