1,721,044 research outputs found
Field trial of a photonics-based dual-band fully coherent radar system in a maritime scenario
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Pandora: Single unit fully coherent S and X band software defined radar
No full textA photonic-based coherent dual band radar system demonstrator, tested in an
operative aerial scenario, is presented. Photonic technologies have been used for
simultaneous generation and detection of radar signals in the S- and X-band. The sharing
of a single transceiver for both the frequency bands allows for a perfect coherence among
the generated waveforms
Photonics-Assisted Multiband RF Transceiver for Wireless Communications
No full textIn this paper, the concept of a fully photonics-based multiband radio-frequency transceiver is presented. In the proposed architecture, the precision, wide bandwidth, and flexibility of the photonic technologies allow generating and detecting simultaneous multiple wireless signals in an extremely wide frequency range, up to the millimeter waveband. This approach is therefore promising for future wireless base stations that will need to handle huge data traffic distributed on several different transmission protocols, while minimizing the hardware components. In the proposed system, the capability of easily treating multiple signals simultaneously, and the architecture based on a single pulsed laser for both the transmitter and the receiver sections, permit to reduce the complexity of the transceiver while increasing its functionalities, with a potential benefit in terms of system costs. The paper details the principle of operation of the proposed solution, and describes the implementation of a dual-band wireless transceiver simultaneously working in the X and S bands. The results from the characterization of the transceiver and from its verification in a wireless transmission experiment confirm the potentials of the solution and set the basis for a new paradigm of RF transceivers
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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