1,721,000 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 for radar networks and electronic warfare systems
No full textThis book outlines the potential for microwave photonics in radar and electronic warfare systems, covering basic concepts and functions, comparing performance with conventional systems, describing its impact on digital signal processing, and exploring integration issues
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
Jitter-limited photonic analog-to-digital converter with 7 effective bits for wideband radar applications
No full textA photonic analog-to-digital converter exploiting a sample time-interleaving approach is presented, showing more than 7 effective bits for input signals up to 40GHz and bandwidth up to 200MHz. The effective 1-to-4 optical sample parallelization scheme does not contaminate the low sampling jitter with limited crosstalk. A real-time digital post-processing is also added to increase the ADC linearity and to minimize the spurious tones induced by the digital data interleaving. The results show that the scheme is fundamentally limited by the sampling jitter and it approaches the theoretical limits for the considered signal frequencies. Discussions are also reported, demonstrating that the proposed photonic ADC can be upgraded to accept signals with larger bandwidth without performance reductions. © 2013 IEEE
Photonics Techniques for the Flexible Generation of Ultra-Stable Microwave and Millimeterwave Radar Signals
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