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About Mark C J Posen
Expertise
I am happy to answer questions of a technical and regulatory nature in the area of satellite and radio communications. I am best able to answer questions about systems and technology and less able to respond to questions about specific hardware and equipment setup and installation, but I'm happy to try and address any question put my way.
My main areas of expertise are link analysis (link budgets, performance, Eb/No, capacity), interference analysis (C/I, protection ratios, interference avoidance), spectrum management (frequency coordination, inter-system sharing), Radio Regulation (ITU, ITU-R) and satellite technologies and trends.
Experience
I have worked as a satellite communications engineer at a professional level since 1983. Since 1990, as Managing Director of RPC Telecommunications Limited, I have operated a private satellite communications consultancy and have provided technical support to many satellite operators and national governments.
Organizations
IET - Institution of Engineering and Technology, IEEE - Institute of Electrical and Electronic Engineers
Education/Credentials
B.Sc. Electrical and Electronic Engineering, Bristol University, 1983, M.Sc. Satellite Communications Engineering, Surrey University, 1986
Awards and Honors
C.Eng. - Chartered Engineer registered with the Engineering Council (UK)
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You are here: Experts > Industry > Satellite Communications > Satellite Communications > satellite communication
Expert: Mark C J Posen - 10/20/2009
Question
How to calculate sun outage for a place
Answer
Hello,
Many thanks for this question.
Unfortunately it's much too complicated to describe the process here. You need an accurate model of the sun's movement relative to the Earth and then you need to calculate the 3D geometry to work out how the sun's position moves in elevation and azimuth, over time, as viewed from the location of interest, and compare this to the elevation and azimuth of the satellite viewed from the same location. Finally you need to calculate the increase in the earth-station antenna noise contribution to the receiving system G/T as the solar disk moves through the sidelobes and into the antenna main beam.
This would take several pages of mathematics and, although I wrote some software to do this calculation maybe 20 years ago, really now I cannot recall the exact detail! You may be able to find some detail by searching the web, or looking in a text-book.
If you just want the result, rather than the method you can try:
1) Download the trial version of Satmaster Pro (www.arrowe.com) as this has a sun-outage calculator built in.
2) Try this online calculator: http://www.satellite-calculations.com/SUNcalc/SUNcalc.htm
I hope this helps. Please remember to rate this answer.
Regards,
Mark C J Posen C.Eng. MIET
RPC Telecommunications Ltd.
http://www.rpctelecom.com
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