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GPS-3 (Navstar-3)

GPS-3 [Lockheed Martin]

GPS-3 (Global Positioning System) or Navstar-3 (Navigation System using Timing And Ranging) are the first evolution stage of the third generation of the GPS satellites.

The U.S. Air Force announced in May 2008 that a team led by Lockheed Martin has won the competition to build the next-generation Global Positioning System (Navstar) Space System program, known as GPS III.

This program will improve position, navigation, and timing services for the warfighter and civil users worldwide and provide advanced anti-jam capabilities yielding superior system security, accuracy and reliability.

Under the $1.4 billion Development and Production contract awarded today by Secretary of the Air Force Michael Wynne and the Global Positioning Systems Wing, Space and Missile Systems Center, Los Angeles Air Force Base, Calif., the team of Lockheed Martin Space Systems Company, ITT Corporation, and General Dynamics, will produce eight GPS III satellites, with first launch projected for 2014. The development contract will result in approximately 500 new jobs for Lockheed Martin.

When fully deployed, the GPS III constellation will feature a cross-linked command and control architecture, allowing the entire GPS constellation to be updated simultaneously from a single ground station. Additionally, a new spot beam capability for enhanced military (M-Code) coverage and increased resistance to hostile jamming will be incorporated. These enhancements will contribute to improved accuracy and assured availability for military and civilian users worldwide.

As the program's Space System prime contractor, Lockheed Martin is leveraging its proven record of providing progressively advanced spacecraft for the current GPS constellation. The team designed and built 21 GPS IIR satellites for the Air Force and subsequently modernized eight of those spacecraft, designated GPS IIR-M, to enhance operations and navigation signal performance.

For GPS III, Lockheed Martin's program management and spacecraft development effort will occur at its facilities in Newtown, Pa., with final assembly, integration and test located in Denver. The company's Sunnyvale, Calif., operations will provide various spacecraft components and a launch support team will be based at Cape Canaveral, Fla. Lockheed Martin's flight-proven A2100 bus will serve as the GPS III spacecraft platform. Unlike the GPS IIF satellite, the GPS III satellite feature an apogee propulsion system.

ITT, Clifton, N.J. will provide the navigation payload, and General Dynamics Advanced Information Systems, Gilbert, Ariz., will provide the Network Communications Element (NCE) which includes the UHF Crosslink and Tracking Telemetry & Command (TT&C) subsystems.

Originally, a block upgrade strategy was planned with eight GPS IIIB and 16 GPS IIIC satellites following, with each increment including additional capabilities based on technical maturity. The Air Force decided in 2011 to stabilize the GPS-3 production line before introducing upgrades to the system. The decision to not to upgrade GPS-3 according to a block schedule will remove constraints and allow for adding on the technology when the threat calls for doing so. In addition, the complexity of position, navigation and timing technology has evolved since the Air Force awarded the GPS-3 prime contract in 2008. Anti-jam capabilities are planned to be added to the system beginning with the ninth satellite.

Also carried as a secondary payload are nuclear detonation detection sensors (NDS).

The first two satellites were ordered in 2008. Each two more followed in the years 2012, 2013, 2014 and 2016.

Launch vehicles will be Atlas-5(411), Delta-4M+(4,2), Falcon-9 v1.2 (Block 5) and Vulcan Centaur VC0S rockets for single launches. Dual launches on larger rockets like Atlas-5(551) or Falcon-Heavy (Block 5) were considered for the 9th satellite onward.

Nation: USA
Type / Application: Navigation
Operator: US Air Force (USAF) → US Space Force (USSF)
Contractors: Lockheed Martin
Equipment: ?
Configuration: A2100A
Propulsion: LEROS-1c ?
Power: 2 deployable solar arrays, batteries
Lifetime: 15 years
Mass: 4400 kg (#1); 3680 kg (#2); 4311 kg (#3); 4352 kg (#6); 2269 kg (dry)
Orbit: 20200 km × 20200 km, 55.0 (typical)
Satellite COSPAR Date LS Launch Vehicle Remarks
GPS-3 1 (GPS SVN 74, Navstar 77, USA 289, Vespucci) 2018-109A 23.12.2018 CC SLC-40 Falcon-9 v1.2 (Block 5)(ex)
GPS-3 2 (GPS SVN 75, Navstar 78, USA 293, Magellan) 2019-056A 22.08.2019 CC SLC-37B Delta-4M+(4,2) (upg.)
GPS-3 3 (GPS SVN 76, Navstar 79, USA 304, Matthew Henson) (ex Columbus) 2020-041A 30.06.2020 CC SLC-40 Falcon-9 v1.2 (Block 5)
GPS-3 4 (GPS SVN 77, Navstar 80, USA 309, Sacagawea) 2020-078A 05.11.2020 CC SLC-40 Falcon-9 v1.2 (Block 5)
GPS-3 5 (GPS SVN 78, Navstar 81, USA 319, Neil Armstrong) 2021-054A 17.06.2021 CC SLC-40 Falcon-9 v1.2 (Block 5)
GPS-3 6 (GPS SVN 79, Navstar 82, USA 343, Amelia Earhart) 2023-009A 18.01.2023 CC SLC-40 Falcon-9 v1.2 (Block 5)
GPS-3 7 (GPS SVN xx, Navstar xx, Sally Ride) - 2024 CC SLC-41 Vulcan Centaur VC0S with D 1
GPS-3 8 (GPS SVN xx, Navstar xx, Katherine Johnson) - 202x CC Vulcan Centaur VC0S
GPS-3 9 (GPS SVN xx, Navstar xx, Ellison Onizuka) - 2025 CC Vulcan Centaur VC0S
GPS-3 10 (GPS SVN xx, Navstar xx, Hedy Lamarr) - 202x CC Falcon-9 v1.2 (Block 5)


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