The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper describes a low-cost real-time geo location system that uses two multiple-antenna sites to provide secondary surveillance at small to medium size airports. Tower controllers at these airports currently rely primarily on visual surveillance to maintain situational awareness, which can be impaired at night and during bad weather. While the nations busiest airports have the ASDE-X radar surveillance...
This paper considers the problem of jointly processing messages received over a forward link from a single distant transmitter to a cooperative receive cluster connected by a local area network with finite available throughput. For N cooperating receivers, ideal distributed receive beamforming with direct exchange of unquantized observations leads to an N-fold gain in signal-to-noise ratio (SNR) for...
Simulation approaches and results are provided for Dynamic Spectrum Access (DSA) with low-capability distributed spectrum monitoring equipment. There are two major issues that arise when using this approach: how to most efficiently distribute the sensors, and how to best utilize sensor information? Results show that it is better to co-locate distributed sensors with supported radios rather than disperse...
This paper addresses the use of distributed coherent communication techniques across a wireless network of tactical radios to enable extended-range communications. Conventional tactical communication systems providing multi-kilometer terrestrial ranges utilize large and costly manpack or vehicular-mount radios. In this paper we discuss techniques for distributing the transmit functions coherently...
Simulation approaches and results are provided for Dynamic Spectrum Access (DSA) with remote wide-area spectrum monitoring equipment and moderate delay in spectrum data dissemination. Issues expected to arise using this approach include information delay time, failure to detect all transmitters, transmitter location errors, poor transmit-power estimates, and errors in the propagation model used to...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.