A C/I advantageous satellite system configuration for land mobile applications |
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Authors: | Russo P d'Ippolito A Ferrarotti A Ruggieri M |
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Affiliation: | (1) Space Engineering, Via dei Berio 91, 00155 Roma, Italy;(2) Department of Electronics Engineering, University of Roma “Tor Vergata”, Via di Tor Vergata, 00133 Roma, Italy |
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Abstract: | A satellite system based on the frequency scanning concept has been recently assessed for L‐band land mobile communications.
The study – promototed by ESA/ESTEC for an European application mission – has reached an advanced electrical design phase.
The selected configuration is particularly advantageous in terms of Carrier‐to‐Intermodulation ratio (C/I) performance, which
constitutes a requirement of key‐importance in the envisaged user applications. The advantage in C/I is due to the proper
choice of the on‐board transmitter configuration, which adopts power module pairs where the overall power demand is evenly
distributed. The consequent improved C/I is then achievable at both transmitter and radiated far field level. The present
paper aims a contribution to the design methodology of frequency scanning satellite systems, by joining two key‐aspects: in
fact an analytical approach is proposed to demonstrate the C/I advantage achievable through frequency scanning satellite systems
and the methodology is applied to a concrete example, the ESA/ESTEC system, whose feasibility has been fully proved in previous
studies. The analysis is performed both at transmitter level and in the far field. The main results achieved are hereinafter
presented.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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