نتایج جستجو برای: millimetre wave receiver
تعداد نتایج: 270435 فیلتر نتایج به سال:
We describe the physical-optics modelling of a millimetre-wave imaging system intended to enable automated detection of threats hidden under clothes. This paper outlines the theoretical basis of the formation of millimetre-wave images and provides the model of the simulated imaging system. Results of simulated images are presented and the validation with real ones is carried out. Finally, we pr...
Millimetre-waves offer the possibility of wide bandwidth and consequently high data rate for wireless communications. For both uniand dual-polarized systems, signals sent over a link may suffer severe degradation due to antenna misalignment. Orientation robustness may be enhanced by the use of mutual orthogonality in three dimensions. Multipleinput multiple-output polarization diversity offers ...
We experimentally investigate the potential of using 'self-healing' Bessel-Gaussian beams carrying orbital-angular-momentum to overcome limitations in obstructed free-space optical and 28-GHz millimetre-wave communication links. We multiplex and transmit two beams (l = +1 and +3) over 1.4 metres in both the optical and millimetre-wave domains. Each optical beam carried 50-Gbaud quadrature-phase...
The subject of this Ph.D. thesis is the redesign of an airborne water-vapour radiometer AMSOS (Airborne Millimetreand Submillimetre Observing System) and measurements conducted with the new receiver. The thesis consists of three parts and four publications. The publications are placed within the thesis after appropriate chapters. The first part is an introduction which addresses the scientific ...
The ATRIUM project aims to the automatic detection of threats hidden under clothes using millimetre-wave imaging. We describe a simulator of realistic millimetre-wave images and a system for detecting metallic weapons automatically. The latter employs two stages, detection and tracking. We present a detector for metallic objects based on mixture models, and a target tracker based on particle fi...
With the rapidly growing interest in millimetre-wave and sub-millimetre-wave systems, the lack of traceability for measurements at these wavelengths is becoming ever more of a problem. Making comparable measurements of fundamental parameters, such as power, is very difficult and no proper calibrations traceable to SI realisations are available. At NPL, work undertaken in the 1980s led to the de...
this paper presents the design and simulation of a typical ka band satellite beacon receiver for propagation experimentation. using satellite beacon signal as a reference signal in satellite wave propagation study, is one of the most important methods. satellite beacons are frequently available for pointing large antennas, but such signals can be used for measuring the effect of natural phenome...
At millimetre wave frequencies, it is possible to expect increased system performance through the use of smart antenna configurations associated with some signal processing capabilities. The analysis and design of intelligent antenna arrays for millimetre wave systems applications can be undertaken using different technologies and techniques but a new and powerful approach using CPW (coplanar w...
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