NDLI: Method of estimating the link quality of a UHF SATCOM channel

Content Provider	IEEE Xplore Digital Library
Author	Booton, R.
Copyright Year	2011
Description	Author affiliation: Harris Corporation RFCD, Rochester, NY, USA (Booton, R.)
Abstract	While the use of geostationary satellites allows tactical radios users to achieve beyond the line-of-sight communications nearly anywhere within the footprint of a satellite system, the use of directional antennas forces the radio operator to know the precise location of the satellite that is being used. Though a pointing guide and compass can work reasonably well when positioning an antenna, the Signal to Noise Ratio (S/N) thresholds of the highest date rate modems require more precise positioning to improve the system link margin and achieve a reasonable Bit Error Rate (BER). Additionally, one of the requirements of the Integrated Waveform (DAMA UHF SATCOM), specified in MIL-STD-188-181C/182B/183B/185A, calls for the ability to measure the Carrier Power to Noise Spectral Density Ratio (C/No) of the received FOW to within a certain degree and report the measured results to the IW Channel Controller (CC). This information facilitates the allocation of TDMA time slots with the appropriate over-the-air modem to support a reasonable BER given the terminal's channel conditions. The same techniques that can be utilized to meet the IW channel quality reporting requirements can be leveraged to create a system that assists terminal operators with antenna placement by informing them when optimal antenna placement is achieved and the appropriate over-the-air modem to utilize given the measured C/No. This paper will discuss the utilization of fast Fourier transforms (FFTs) in the determination of MILSATCOM channel quality in order to improve the ability of a system to select the optimal over-the-air modem and provide the user with the ability to manually locate geostationary satellites.
Starting Page	477
Ending Page	482
File Size	341386
Page Count	6
File Format	PDF
ISBN	9781467300797
ISSN	21557578
e-ISBN	9781467300810
DOI	10.1109/MILCOM.2011.6127716
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Satellites Channel estimation Noise Correlation Satellite antennas Bandwidth Directive antennas
Content Type	Text
Resource Type	Article

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