منابع مشابه
Consideration of Interference Analysis for Wireless Systems in VHF/UHF Bands with Geographic Information
With the help of Rec. ITU-R P.1546 and geography information system, the interference analysis for the fixed wireless system and radar is presented based upon the frequencydistance rules with minimum coupling loss. To obtain the computational results, real geography information on the map was taken for the given area of 80x60[km] 2 , and field strength and path profile were illustrated for rada...
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The radar interferometer technique on two separate antennas. The coherence first used at the magnetic equator in Peru is (amplitude) of the cross spectrum at each also a very powerful means for studying auroral frequency is a measure of how localized the plasma instabilities. We present here the first scattering target corresponding to that results, obtained with a 49.92 MHz, 20-25 KW peak part...
متن کاملB-vhf – a Multi-carrier Broadband Communications Concept for Air Traffic Management in the Vhf Band
In this paper we describe an European initiative aiming to establish a broadband Very High Frequency (VHF) aeronautical communications system based on a multi-carrier technology and demonstrate its benefits to the aeronautical community, together with its technological fundamentals. The European research project B-VHF (“Broadband VHF Aeronautical Communications System based on Multi-Carrier Tec...
متن کاملClutter model for VHF SAR imagery
We present a physically-based clutter model for low frequency synthetic aperture radar that includes both distributed scatterers and large-amplitude discrete clutter. The model is used to generate a synthetic forest clutter scene comprised of two components, a background component and a heavy-tailed discrete component. Model parameters are based on characteristics of the scene, such as the rada...
متن کاملHF , VHF , and UHF Systems and Technology
A wide variety of unique systems and components inhabits the HF, VHF, and UHF bands. Many communication systems (ionospheric, meteor-burst, and troposcatter) provide beyond-line-of-sight coverage and operate independently of external infrastructure. Broadcasting and over-the-horizon radar also operate in these bands. Magnetic-resonance imaging uses HF/VHF signals to see the interior of a human ...
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ژورنال
عنوان ژورنال: Journal of Navigation
سال: 1975
ISSN: 0373-4633,1469-7785
DOI: 10.1017/s0373463300025728