Communication Satellite Hardware

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Overview. The Beginning of Comm SatellitesFour Segments of MILSATCOMSummary. The Beginning of Comm Satellites. Sputnik 1 first satellite launched with radio transmittersTwo radio transmitters onboard Project Score program provides world's first communication satellite in 1958. Four MILSATCOM Seg

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Communication Satellite Hardware

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1. Communication Satellite Hardware Evan Briggs ASCI 601 Applications in Space Topic Paper

2. Overview The Beginning of Comm Satellites Four Segments of MILSATCOM Summary

3. The Beginning of Comm Satellites Sputnik 1 first satellite launched with radio transmitters Two radio transmitters onboard Project Score program provides world’s first communication satellite in 1958 * Score provided a first test of a communications relay system in space and captured world attention by broadcasting a Christmas message via short wave frequency from an onboard tape recorder * Score provided a first test of a communications relay system in space and captured world attention by broadcasting a Christmas message via short wave frequency from an onboard tape recorder

4. Four MILSATCOM Segments UHF SHF Milstar Commercial Satellites

5. UHF Tactical Satellite Communication (TACSATCOM) Equipped with two transponders at 10 MHz each X-Band UHF

6. UHF cont. US Navy Fleet Satellite Communications System (FLTSATCOM) Follow-on to TACSATCOM Each satellite had 23 communications channels in the ultra-high and super-high frequency bands

7. SHF Defense Communications Satellite (DSCS) Constellation of approx eight satellites Contained single X-band transponder with 26 MHz bandwidth Three generations were produced DSCS-2 consisted of two 20watt X-Band transponders with 500 MHz bandwidths DSCS-3 used six separate SHF channels capable of Full Earth and narrow coverage capabilities through the use of two receive and two transmit antennas

8. Milstar Milstar constellation consists of five operational satellites Uses UHF/EHF Payloads equipped for low and medium data rate ability in EHF range Low data rate payload - 192 channels Medium data rate payload includes two nulling spot antennas used to id. and pinpoint location of jammers and electronically isolate its signal Two generations Milstar currently in operation with planned third to come online this year

9. Commercial Satellites Utilized when jam resistant secure communication not necessary Reduces government cost for satellite constellation maintenance Iridium Satellite System Satellite-based, wireless communication network allowing narrow band transmission Voice, date, fax, or paging

10. Summary Overview The Beginning of Comm Satellites Four Segments of MILSATCOM

11. Questions?

12. References Fact Sheet. (2006). U.S. Air Force Fact Sheet: Milstar Satellite Communications System. Retrieved November 25, 2006, from http://www.afspc.af.mil/library/factsheets/factsheet.asp?id=3655. DSCS-1. (2005). DSCS-1. Retrieved November 25, 2006, from http://www.globalsecurity.org/space/systems/dscs_1.htm DSCS-3. (2005). DSCS-3. Retrieved November 25, 2006, from http://www.globalsecurity.org/space/systems/dscs_3.htm Space Satellite Communications. (2005). TACSAT. Retrieved November 25, 2006, from http://www.globalsecurity.org/space/systems/tacsat.htm Space Satellite Communications. (2005). FLTSATCOM Fleet Satellite Communications System. Retrieved November 25, 2006, from http://www.globalsecurity.org/space/systems/fltsat.htm Military Space Programs. (1997). FLTSATCOM Fleet Satellite Communications System. Retrieved November 25, 2006, from http://www.fas.org/spp/military/program/com/fltsat.htm Military Space Programs. (1997). DSCS-1. Retrieved November 25, 2006, from http://www.fas.org/spp/military/program/com/dscs_1.htm Military Space Programs. (1996). Milstar-1. Retrieved November 25, 2006, from http://www.fas.org/spp/military/program/com/milstar1.htm Military Space Programs. (2000). Milstar-2. Retrieved November 25, 2006, from http://www.fas.org/spp/military/program/com/milstar2.htm

13. References cont Military Space Programs. (2000). Leased Commercial. Retrieved November 25, 2006, from http://www.fas.org/spp/military/program/com/leased.htm Mission and Spacecraft Library. (n.d.). DSCS (Defense Satellite Communications System). Retrieved November 25, 2006, from http://msl.jpl.nasa.gov/Programs/dscs.html Mission and Spacecraft Library. (n.d.). DSCS II. Retrieved November 25, 2006, from http://msl.jpl.nasa.gov/QuickLooks/dscs2QL.html Mission and Spacecraft Library. (n.d.). DSCS III. Retrieved November 25, 2006, from http://msl.jpl.nasa.gov/QuickLooks/dscs3QL.html Mission and Spacecraft Library. (n.d.). Milstar. Retrieved November 25, 2006, from http://msl.jpl.nasa.gov/QuickLooks/milstarQL.html Mission and Spacecraft Library. (n.d.). Iridium. Retrieved November 25, 2006, from http://msl.jpl.nasa.gov/QuickLooks/iridiumQL.html Mission and Spacecraft Library. (n.d.). Military Communication Satellites. Retrieved November 25, 2006, from http://www.fas.org/spp/military/program/com/intro.htm Project Score. (2006). Project Score. Retrieved November 25, 2006, from http://en.wikipedia.org/wiki/Project_SCORE Sputnik 1. (2006). Sputnik 1. Retrieved November 25, 2006, from http://en.wikipedia.org/wiki/ Sputnik_1

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