SATCOM-on-the-move link emulator based on physical propagation models

Authors:
William Sward;Jeff Papenfuss;David Reed;Steven Williams
Affiliations:
RT Logic, Inc., Colorado Springs, CO;RT Logic, Inc., Colorado Springs, CO;RT Logic, Inc., Colorado Springs, CO;RT Logic, Inc., Colorado Springs, CO
Venue:
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Year:
2009

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Abstract

Mobile satellite communications are affected by signal distortions that are negligible in traditional, fixed SATCOM applications. These distortions include delay and Doppler spread multipath that exhibit significant variations over a relatively short period. Accurate modeling and emulation of the fast fading multipath requires substantially different techniques than the slow fading models traditionally used for satellite communication systems. This paper presents a physically based model for accurate modeling of fast fading in a SATCOM-On-The-Move (SOTM) environment. A dynamic link emulator is described that provides hardware-in-the-loop testing of SOTM modems and systems. Of particular importance is the phase continuous emulation of both carrier and data Doppler and propagation delay.