World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0036393961
Reproduction Date:

Title: Usa-203  
Author: World Heritage Encyclopedia
Language: English
Subject: GPS Block IIF, Global Positioning System, Navstar 7, GPS satellite blocks, USA-126
Publisher: World Heritage Encyclopedia


A Block IIRM GPS satellite
Mission type Navigation
Operator US Air Force
COSPAR ID 2009-014A[1]
SATCAT № 34661[1]
Mission duration 10 years (planned)
Never entered service
Spacecraft properties
Spacecraft type GPS Block IIRM[2]
Bus AS-4000[2]
Manufacturer Lockheed Martin[2]
Launch mass 2,032 kilograms (4,480 lb)[2]
Start of mission
Launch date 24 March 2009, 08:34 (2009-03-24T08:34Z) UTC
Rocket Delta II 7925-9.5, D340[3]
Launch site Cape Canaveral SLC-17A[3]
End of mission
Deactivated Did not recognize date. Try slightly modifying the date in the first parameter.
Orbital parameters
Reference system Geocentric
Regime Medium Earth
Perigee 20,045 kilometres (12,455 mi)[4]
Apogee 20,335 kilometres (12,636 mi)[4]
Inclination 55.8 degrees[4]
Period 718 minutes[4]

USA-203, also known as GPS IIR-20(M), GPS IIRM-7 and GPS SVN-49, was an American navigation satellite which was intended to become part of the Global Positioning System. It was the sixth of seven Block IIRM satellites to be launched, and the twentieth of twenty one Block IIR satellites overall. It was built by Lockheed Martin, using the AS-4000 satellite bus, and had a mass of 2,032 kilograms (4,480 lb).[2]

USA-203 was launched at 08:34 UTC on 24 March 2009, atop a Delta II carrier rocket, flight number D340, flying in the 7925-9.5 configuration.[3] The launch took place from Space Launch Complex 17A at the Cape Canaveral Air Force Station,[5] and placed USA-203 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor.[2]

USA-203 is located in an orbit with a perigee of 20,045 kilometres (12,455 mi), an apogee of 20,335 kilometres (12,636 mi), a period of 718 minutes, and 55.8 degrees of inclination to the equator.[4] It was intended to operate in slot 2 of plane B of the GPS constellation, replacing USA-128,[6] and to broadcast signal PRN-01.[7] During on-orbit testing an anomaly was discovered with the signals it was broadcasting, which prevented its operational use. It was decommissioned on 6 May 2011, two years into its ten year design life.

In addition to its operational navigation signals, USA-203 was also equipped to broadcast a demonstration of the L5 signal which would be introduced with the GPS Block IIF series. The satellite was able to broadcast this signal correctly, however it was discovered that a filter used to produce the L5 signal was causing the disruption to its other frequencies.[7]


  1. ^ a b "Navstar 63". US National Space Science Data Center. Retrieved 11 July 2012. 
  2. ^ a b c d e f Krebs, Gunter. "GPS-2RM (Navstar-2RM)". Gunter's Space Page. Retrieved 11 July 2012. 
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012. 
  4. ^ a b c d e "NAVSTAR 63 (USA 203)". n2yo. Archived from the original on 11 July 2012. Retrieved 11 July 2012. 
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 11 July 2012. 
  6. ^ Ray, Justin (24 March 2009). "Delta 2 rocket delivers another GPS satellite to orbit". Spaceflight Now. Retrieved 11 July 2012. 
  7. ^ a b Goldstein, David. "Request for Feedback on GPS IIR-20 (SVN-49) Mitigation Options". US Air Force. Retrieved 11 July 2012. 
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.