Page 46 - Satellite Communications, Fourth Edition
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26 Chapter One
1.13. The Cospas-Sarsat Web site is at http://www.cospas-sarsat.org. Access
this site and find out the number and location of the LEOLUTs in current use.
1.14. Using information obtained from the Cospas-Sarsat Web site, find out
which satellites carry (a) 406-MHz SAR processors (SARPs), (b) 406-MHz SAR
repeaters (SARRs), and (c) 121.5-MHz SARRs. What is the basic difference
between a SARP and a SARR?
1.15. Intelsat satellite 904 is situated at 60°E. Determine the land areas
(markets)the satellite can service. The global EIRP is given as 31.0 up to 35.9
dBW, beam edge to beam peak. What are the equivalent values in watts? (see
App. G for the definition of dBW).
1.16. A satellite is in a circular polar orbit at a height of 870 km, the orbital
period being approximately 102 min. Assuming an average value of earth’s
radius of 6371 km determine approximately the maximum period the satellite
is visible from a beacon at sea level.
1.17. A satellite is in a circular polar orbit at a height of 870 km, the orbital
period being approximately 102 min. The satellite orbit passes directly over a
beacon at sea level. Assuming an average value of earth’s radius of 6371 km
determine approximately the fractional Doppler shift at the instant the satellite
is first visible from the beacon.
References
Argos. 2005. General information to info@argosinc.com Customer support to DUS, at
www.argosinc.com/documents. From the menu list select sysdesc.pdf
Brown, M. P., Jr. (Ed.). 1981. Compendium of Communication and Broadcast Satellites
1958 to 1980. IEEE Press, New York.
Cospas-Sarsat, at http://www.cospas-sarsat.org/
Cospas-Sarsat, at http://www.cospas-sarsat.org/Beacons/406Bcns.htm
Cospas-Sarsat, at http://www.cospas-sarsat.org/Status/spaceSegmentStatus.htm
Cospas-Sarsat, at http://www.equipped.com/cospas-sarsat_overview.htm
Cospas-Sarsat. 1994a. System Data No. 17, February.
Cospas-Sarsat. 1994b. Information Bulletin No. 8, February.
Cospas-Sarsat. 2004. Information Bulletin No.17, November, at http://www.cospas-
sarsat.org
FCC. 1983. “Licensing of Space Stations in the Domestic Fixed-Satellite Service and
Related Revisions of Part 25 of the Rules and Regulations, Report 83-184 33206, CC
Docket 81-184.” Federal Communications Commission, Washington, DC.
FCC. 1997 “Assignment of Orbital Locations to Space Stations in the Ka-Band.” Adopted
May 8, 1997, released May 9, at http://www.fcc.gov/Bureaus/International/
Orders/1997/da970967.txt
FCC. 1996. “Orbital Assignment Plan,” at http://www.fcc.gov/Bureaus/International/
Orders/1996/da960713.txt
Government of Canada. 1983. “Direct-to-Home Satellite Broadcasting for Canada.” IEEE
Spectrum, March.
Information Services, Department of Communications. Intelsat, at http://www.intelsat.com/
Lilly, C. J. 1990. “INTELSAT’s New Generation.” IEE Review, Vol. 36, No. 3, March.
NOAA, at http://www.ipo.noaa.gov/
