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Authors: Bianchi, C.* 
Baskaradas, J. A.* 
Pietrella, M.* 
Sciacca, U.* 
Zuccheretti, E.* 
Title: Power variation analysis of echo signals from ionospheric reflectors
Journal: Advances in space research 
Series/Report no.: / 51 (2013)
Publisher: Elsevier Science Limited
Issue Date: Feb-2013
DOI: 10.1016/j.asr.2012.09.045
Keywords: Ionospheric soundings
Fading fluctuation
Time-variant ionospheric channel
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation 
01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques 
05. General::05.01. Computational geophysics::05.01.04. Statistical analysis 
Abstract: A series of Power Virtual Height measurements (PVH) of radio echoes reflected from the ionosphere were acquired at a given frequency during the period 3–22 January 2008 with the purpose of studying the slow fading variations through time of the ionospheric channel. To obtain PVH data, an ionospheric vertical sounding system was suitably adapted to work at a single fixed frequency. PVH measurements were recorded between two routine ionospheric vertical soundings, providing a data type that enables evaluation of fading fluctuation through time. The time stability of the ionospheric layers is determined by analyzing the level of the received signal power within a chosen threshold. In this paper the fading behaviour and its characteristics are described, considering only temporal periodicity above 0.5 s. In a further analysis a relation is demonstrated between the recorded fading and the time stability of the signal within a fixed interval of values.
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