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967 documents found for International Journal
1090 MHz channel capacity improvement in the air traffic control context
Emilio G. Piracci, Gaspare Galati, Nicolas Petrochilos, Fabrizio Fiori
Published online : 01-06-2009
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The aim of this study is to increase the capacity of the 1090 MHz secondary surveillance radar (SSR) channel by novel transmission and decoding techniques. In particular, multilateration stations have omni-directional antennae; hence considering aircraft traffic and including the extension of surveillance to cooperating vehicles, the reception of superimposed signals is more and more probable. We
Potential accuracy of object localization with multilateration systems
Victor Chernyak
Published online : 01-06-2009
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Multilateration (MLAT) systems and wide area MLAT (WAM) systems are particular cases of multisite (multistatic) radar systems (MSRSs): passive MSRSs (PMSRSs) with known expected signal waveforms. One of the most stringent requirements on an MLAT system is a very high accuracy of target (emitter) localization. In view of this, the potential accuracy of emitter localization (PAEL) based on Cramer?Ra
Subspace-based estimation of time of arrival and Doppler shift for a signal of known waveform
V.V. Latyshev
Published online : 01-06-2009
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The subspace-based technique is used for the estimation of the time of arrival and Doppler shift of a signal of known waveform. The tool to find required subspaces is a special orthogonal decomposition of received data. It allows one to concentrate Fisher information on the desired parameter in just a few of the first terms of the decomposition. This approach offers a low-dimensional vector of suf
Novel concepts for surface movement radar design
Konstantin Lukin, Anatoliy Mogila, Pavlo Vyplavin, Gaspare Galati, Gabriele Pavan
Published online : 01-06-2009
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Traditional millimeter-wave surface movement radar (SMR) has been designed and tested. A novel concept for the design of a new SMR is suggested based on synthetic aperture antenna and noise radar technology. It enables designing SMR without mechanical rotation of an antenna, but applying several nonmoving synthetic aperture antennas instead. Application of noise radar technology is also considered
ISAR imaging of helicopters using millimeter wave radars
Helmut Essen, Manfred Hägelen, Alfred Wahlen, Karsten Schulz, Klaus Jäger, Marcus Hebel
Published online : 01-06-2009
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The capabilities of millimeter wave radars have been demonstrated for a long period of time for missile seeker applications and for automotive radars. The technological advantages of this type of radar can be adapted to security applications in air traffic management at short and medium range as well as on the ground. The application discussed in this paper focuses on inverse synthetic aperture ra
Two efficient localization algorithms for multilateration
Mauro Leonardi, Adolf Mathias, Gaspare Galati
Published online : 01-06-2009
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Two localization algorithms for multilateration systems are derived and analyzed. Instead of the classical time difference of arrival (TDOA), a direct use of the time of arrival (TOA) is made. The algorithms work for arbitrary spatial dimensions and overdetermined systems. These derivations are tested in a real-case implementation with simulated data (in particular, the multilateration (MLAT) syst
Evaluation of some features for extended target extraction in polarimetric and non-polarimetric radar
Piet van Genderen, Vsevolod Kovalenko
Published online : 01-06-2009
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Detection in most surveillance radars is based on the condition of point targets against a more or less homogeneous background. Currently, the resolution of many new types of radar is increasing, at least in the range dimension. Therefore many objects can no longer be considered as points. Also as a consequence, the background is becoming more diverse, in statistical terms. The scene addressed in
Opportunity trajectory reconstruction techniques for evaluation of ATC systems
Jesus Garcia, Juan A. Besada, Andres Soto, Gonzalo de Miguel
Published online : 01-06-2009
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This paper describes some key points of a new tool being currently developed by Eurocontrol for the assessment of air traffic control (ATC) multisensor trackers performance. It summarizes the algorithmic foundations of the high-accuracy trajectory reconstruction process used to obtain reference trajectories from recorded measures. These trajectories will serve as a reference for the evaluation of
Foreword
Mahmoud Al Ahmad
Published online : 01-02-2009
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Introduction
Published online : 01-02-2009
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Special issue on surveillance systems for air and airport traffic control
Gaspare Galati, Piet van Genderen
Published online : 01-06-2009
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MRF volume 1 issue 1 Cover and Back matter
Published online : 01-02-2009
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Introduction ? TARGET Special issue
Gottfried Magerl
Published online : 01-04-2009
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The NoE TARGET ? success by cooperation
Gottfried Magerl, Sue Ivan
Published online : 01-04-2009
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This contribution gives an overview of background, design, working principles, and management issues of some scientific highlights, and of the benefits of the Network of Excellence TARGET (Top Amplifier Research Groups in a European Team).
MRF volume 1 issue 1 Cover and Front matter
Published online : 01-02-2009
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High-power monolithic AlGaN/GaN high electron mobility transistor switches
Vincenzo Alleva, Andrea Bettidi, Walter Ciccognani, Marco De Dominicis, Mauro Ferrari, Claudio Lanzieri, Ernesto Limiti, Marco Peroni
Published online : 01-08-2009
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This work presents the design, fabrication, and test of X-band and 2?18 GHz wideband high-power single pole double throw (SPDT) monolithic microwave integrated circuit (MMIC) switches in microstrip gallium nitride (GaN) technology. Such switches have demonstrated state-of-the-art performances and RF fabrication yields better than 65%. In particular, the X-band switch exhibits 1 dB insertion loss,
Implementation of dynamic bias and digital predistortion to enhance efficiency and linearity in a 100 W RF amplifier with OFDM signal
Ludovic Bacque, Gregoire Nanfack-Nkondem, Philippe Bouysse, Guillaume Neveux, Jean Michel Nebus, William Rebernak, Luc Lapierre, Denis Barataud, Raymond Quéré
Published online : 01-08-2009
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This paper presents a technique that enables both efficiency and linearity enhancements of power amplifiers (PA) used in communication systems. It consists in the implementation of a dynamic bias control combined with digital base-band predistortion. The aim of this paper is to describe a methodology and successive steps of the design procedure to reach optimum performances in terms of power added
Theory and experimental validation of a Class E PA above theoretical maximum frequency
Elisa Cipriani, Paolo Colantonio, Franco Giannini, Rocco Giofré
Published online : 01-08-2009
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This paper reports an investigation and a proposed solution to design Class E power amplifiers above the theoretical maximum frequency allowed by the adopted active device. Starting from the traditional time domain analysis, a numerical algorithm has been developed and presented in order to extend Class E feasibility through the optimization of the output voltage waveform. A hybrid Class E amplifi
Design considerations for the hot embossing of microstrip antennas on plastic foils
Andreas Kilian, Michael Fuchs, Lorenz-Peter Schmidt
Published online : 01-08-2009
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In this contribution, fundamental design considerations for a novel metallization technique to realize millimeter-wave microstrip structures are presented. This hot embossing technology is a fast and economic process originating from the production of three-dimensional molded interconnect devices. Conductive structures are coated onto plastic parts or plastic foils using a heated stamp. This appro
Theoretical performance of reiterated LMMSE filtering and coded radar waveforms
Mayazzurra Ruggiano, Emiel Stolp, Piet van Genderen
Published online : 01-08-2009
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Orthogonal frequency division multiplexing (OFDM) waveforms offer strong advantages for integrated communication and radar systems. However, they exhibit inherent high-range sidelobes after matched filtering when standard communication constellation symbols are used for the coding of the carriers. Consequently, they require filtering at the receiver that can serve for sidelobe suppression in order
Power amplifier optimization using base band and multiharmonic source/load-pull characterization with digital predistortion
Ghalid Idir Abib, Eric Bergeault, Souheil Bensmida, Reda Mohellebi
Published online : 01-08-2009
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In this paper, different techniques are combined in a unique characterization system dedicated to power transistor linearity improvement. Successive optimizations are performed using source-pull/load-pull techniques at fundamental, harmonic, and base-band frequencies associated with an instantaneous memoryless base-band predistortion procedure. Measurement results performed at 1.575 GHz on a metal
MRF volume 1 issue 2 Cover and Back matter
Published online : 01-04-2009
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MRF volume 1 issue 2 Cover and Front matter
Published online : 01-04-2009
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Compact dual-mode rectangular waveguide filters using square ridge resonators
Simone Bastioli, Luca Marcaccioli, Roberto Sorrentino
Published online : 01-08-2009
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A new class of compact rectangular waveguide filters is proposed in this paper. The key element is a square ridge resonator realized within a rectangular waveguide supporting the fundamental TE mode. The square ridge can support two modes resonating along orthogonal directions in the gap between the ridge and the opposite waveguide wall. This structure enables dual-mode degeneracy without the need
A rugged 100 W high-voltage vertical MOSFET L-band radar device
Brian Battaglia, Dave Rice, Phuong Le, Bishnu Gogoi, Mike Purchine, Robert Davies, Walt Wright, Dave Lutz, Alex Elliott, Son Tran, Robert Neeley, Will Cai
Published online : 01-08-2009
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The silicon vertical MOSFET RF power amplifier described in this paper is the industry?s first to utilize high-voltage vertical technology. Operating under pulse conditions of 200 µs pulse width and 10% duty cycle, it delivers more than 100 W of peak power. Operating in Class AB with only 50 mA of bias current the device achieves more than 20 dB of gain and 47% power added efficiency at P1dB compr
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