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Impact Of Motion-Induced Antenna Pointing Errors In Mobile Satellite Communication
[Full Text]
AUTHOR(S)
Samuel Kwamena Menanor, Elijah Mwangi, George Kamucha
KEYWORDS
ESIM, ESD, radio interference, pointing error, adjacent
ABSTRACT
Earth Stations in Motion (ESIM) is a new satellite communication technology which allows mobile platforms to communicate with the Geostationary Orbit (GSO) in the Ka-band. The ESIM’s benefits of providing high-power multiple spot beam coverage and allowing very high data rates makes it ideal for commercial use. Small aperture antennas with precise tracking antenna systems are desirable in ESIM systems in order to limit radio interference to adjacent satellite systems. Even with precision in tracking, motion-induced antenna pointing errors are unavoidable. This paper proposes a methodology to analyze the significant contribution made by motion-related antenna pointing errors to the overall interference effects from ESIM to the Fixed Service (FS) station in the 28 GHz frequency band. The results from computer simulation show that a reduction of 5.2 dB in the boresight Effective Isotropic Radiated Power (EIRP) Spectral Density (ESD) was obtained for a parabolic dish with circular aperture diameter of 0.3 m when a fixed antenna pointing error of 0.5˚ was introduced. The overall transmission data rate can be significantly reduced if the International Telecommunication Union (ITU) recommendations are observed.
REFERENCES
[1] https://www.inmarsat.com/blog/earth-stations-in-motion-in-fss-kaband, accessed on 3 June 2019.
[2] F. Ouyang and V. Weerackody, "A statistical approach to quantifying the EIRP spectral density from SOTM terminals," in IEEE Conference on Military Communications, Boston, Massachusetts, USA, October 18-21, 2009.
[3] Dae-Sub Oh and Young-Houng Kang, "Effective Interference Assessment from Earth Station in Motion to Fixed Station in the 28 GHz Band," in 31st IEEE Asia Pacific Conference on Antennas, Electromagnetism, Microwave, Radar, Radio-frequency and Microwave Technology , Kuala Lumpur, Malaysia, November 13-16, 2017.
[4] Recommendation ITU-R S.524-9, "Maximum permissible levels of off-axis e.i.r.p. density from earth stations in geostationary-satellite orbit networks operating in the fixed-satellite service transmitting in the 6 GHz, 13 GHz, 14 GHz and 30 GHz frequency bands," 2006.
[5] ITU Resolution 809, "Agenda for the 2019 world radiocommunication conference," Geneva, Switzerland, November, 2015.
[6] V. Weerackody and L. Gonzalez, "Performance of satellite communications on the move systems in the presence of antenna pointing errors," in IEEE conference on Military Communications , Washington DC, USA, October 23-25, 2006.
[7] V. Weerackody, "Analysis of a Technique that Combats Antenna Pointing Errors in Mobile Satellite Communications," in 26th International Conference on Communications Satellite Systems , San Diego, California, USA, June 10-12, 2008.
[8] J. Debruin, "Control systems for mobile SATCOM antennas," IEEE Control Systems Magazine, vol. 28, no. 1, pp. 86-101, 2008.
[9] Recommendation ITU-R S-1857, "Methodologies to estimate the off-axis e.i.r.p. density levels and to assess the interference towards adjacent satellites resulting from pointing errors of vehicle-mounted earth stations in the 14 GHz frequency band," 2010.
[10] E.G. Cuevas and V. Weerackody, "Technical characteristics and regulatory challenges of communications satellite earth stations on moving platforms," Johns Hopkins APL Technical Digest, vol. 33, no. 1, pp. 37-51, 2015.
[11] Federal Communications Commission, "Guidelines for determining the effective radiated power (ERP) and equivalent isotropically radiated power (EIRP) of a RF transmitting system," August, 2015.
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