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GPS-2R (Navstar-2R)

GPS-2R [Lockheed Martin]

GPS-2R (Global Positioning System) or Navstar-2R (Navigation System using Timing And Ranging) are the third evolution stage of the second generation of the GPS satellites.

The GPS-IIR  replenishment satellites are produced by General Electric Astrospace (later Martin Marietta and Lockheed Missiles & Space) under a contract issued in 1989, which included 21 satellites based on the commercial AS-4000 bus. These provided improved navigation accuracy and longer autonomous satellite operation than earlier model GPS satellites. The satellites were three-axis stabilized and operated at downlink frequencies of 1572.42 MHz and 1227.6 MHz (L-Band) and 2227.5 MHz (S-Band). Lockheed was responsible for launch and flight operations support of the GPS-IIR through 2006.

Block IIR satellites provided dramatic improvements over previous blocks. They could determine their own position by performing inter-satellite ranging with other IIR vehicles. They also had reprogramable satellite processors enabling problem fixes and upgrades in flight, increased satellite autonomy, and radiation hardness.

Additionally, the Block IIR could be launched into any of the required GPS orbits at any time, assuming a 60-day advanced notice, and required many fewer ground contacts to maintain the constellation. All of these improvements result in increased accuracy for GPS users and a cost 33 percent less per satellite than the previous generation of Block IIA satellites. Up to 12 Block IIR satellites were to be modified to use the new military M-code on both the L1 and L2 channel as well as the more robust civil signal L2C on the L2 channel. The M-code signal was to enable GPS operations in a higher jamming environment and reduce vulnerability of military GPS-based systems. The first modified Block IIR (or IIR-M) is planned for launch 2004.

Nation: USA
Type / Application: Navigation
Operator: USAF
Contractors: Lockheed Martin
Equipment: ?
Configuration: AS-4000
Propulsion: Star-37FM
Power: 2 deployable solar arrays, batteries
Lifetime: 10 years
Mass: 2032 kg
Orbit: 20200 km × 20200 km, 55.0
Satellite COSPAR Date LS Launch Vehicle Remarks
GPS-2R 1 (Navstar 42) 1997-F01 16.01.1997 CC LC-17A F Delta-7925
GPS-2R 2 (Navstar 43, USA 132) 1997-035A 23.07.1997 CC LC-17A Delta-7925
GPS-2R 3 (Navstar 46, USA 145) 1999-055A 07.10.1999 CC SLC-17A Delta-7925
GPS-2R 4 (Navstar 51, USA 150) 2000-025A 11.05.2000 CC SLC-17A Delta-7925
GPS-2R 5 (Navstar 44, USA 151) 2000-040A 16.07.2000 CC SLC-17A Delta-7925
GPS-2R 6 (Navstar 41, USA 154) 2000-071A 10.11.2000 CC SLC-17A Delta-7925
GPS-2R 7 (Navstar 54, USA 156) 2001-004A 30.01.2001 CC SLC-17A Delta-7925
GPS-2R 8 (Navstar 56, USA 166) 2003-005A 29.01.2003 CC SLC-17B Delta-7925 with XSS 10
GPS-2R 9 (Navstar 45, USA 168) 2003-010A 31.03.2003 CC SLC-17A Delta-7925
GPS-2R 10 (Navstar 47, USA 175) 2003-058A 21.12.2003 CC SLC-17A Delta-7925
GPS-2R 11 (Navstar 59, USA 177) 2004-009A 20.03.2004 CC SLC-17B Delta-7925
GPS-2R 12 (Navstar 60, USA 178) 2004-023A 23.06.2004 CC SLC-17B Delta-7925
GPS-2R 13 (Navstar 61, USA 180) 2004-045A 06.11.2004 CC SLC-17B Delta-7925
GPS-2R 14 (Navstar 53) - converted GPS-2RM 1
GPS-2R 15 (Navstar 52) - converted GPS-2RM 2
GPS-2R 16 (Navstar 58) - converted GPS-2RM 3
GPS-2R 17 (Navstar 55) - converted GPS-2RM 4
GPS-2R 18 (Navstar 57) - converted GPS-2RM 5
GPS-2R 19 (Navstar 49) - converted GPS-2RM 6
GPS-2R 20 (Navstar 48) - converted GPS-2RM 7
GPS-2R 21 (Navstar 50) - converted GPS-2RM 8