DocumentCode :
766599
Title :
A Measurement of the MARISAT L-Band Signals at Low Elevation Angles Onboard Mobil Aero
Author :
Fang, D.J. ; Tseng, F.T. ; Calvit, T.O.
Author_Institution :
COMSAT Laboratories, Clarksburg, MD, USA
Volume :
30
Issue :
2
fYear :
1982
fDate :
2/1/1982 12:00:00 AM
Firstpage :
359
Lastpage :
365
Abstract :
The MARISAT-to-ship 
-band signals used in maritime mobile satellite communications service are degraded by fading and scintillation at low elevation angles. These degradations are attributed to multipath effects arising from ionospheric, tropospheric, and/or sea surface diffractions. To characterize such degradations, measurements were made at the Southbury earth station and onboard the S.S. Mobil Aero while the ship was en route from Norfolk, VA, to Texas City, TX. Measurements include monitoring the carrier-to-noise ratio ( 
) of time-division multiplex/time-division multiple access (TDM/TDMA) voice carriers and measuring the bit error rate (BER) of 2400/1200 bit/s digital data transmissions through a voice channel. Results indicated that both and BER are severely degraded at elevation angles below 5° due to propagation anomalies. Information useful for design considerations of future maritime communications systems is summarized.
-band signals used in maritime mobile satellite communications service are degraded by fading and scintillation at low elevation angles. These degradations are attributed to multipath effects arising from ionospheric, tropospheric, and/or sea surface diffractions. To characterize such degradations, measurements were made at the Southbury earth station and onboard the S.S. Mobil Aero while the ship was en route from Norfolk, VA, to Texas City, TX. Measurements include monitoring the carrier-to-noise ratio ( ) of time-division multiplex/time-division multiple access (TDM/TDMA) voice carriers and measuring the bit error rate (BER) of 2400/1200 bit/s digital data transmissions through a voice channel. Results indicated that both and BER are severely degraded at elevation angles below 5° due to propagation anomalies. Information useful for design considerations of future maritime communications systems is summarized.Keywords :
Fading channels; Ionospheric propagation; Marine-vehicle communication; Satellite communication, propagation; Sea surface electromagnetic scattering; Tropospheric radio propagation; UHF radio propagation; Bit error rate; Degradation; Diffraction; Fading; L-band; Marine vehicles; Satellite communication; Satellite ground stations; Sea measurements; Sea surface;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1982.1095466
Filename :
1095466
Link To Document :
