A Block IIR GPS satellite
|Operator||US Air Force|
|Mission duration||10 years (planned)|
|Spacecraft type||GPS Block IIR|
|Launch mass||2,032 kilograms (4,480 lb)|
|Start of mission|
|Launch date||21 December 2003, 08:05:00UTC|
|Rocket||Delta II 7925-9.5, D302|
|Launch site||Cape Canaveral SLC-17A|
|Perigee altitude||20,043 kilometres (12,454 mi)|
|Apogee altitude||20,319 kilometres (12,626 mi)|
USA-175, also known as GPS IIR-10 and GPS SVN-47, is an American navigation satellite which forms part of the Global Positioning System. It was the tenth Block IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty one overall. It was built by Lockheed Martin, using the AS-4000 satellite bus.
USA-175 was launched at 08:05:00 UTC on 21 December 2003, atop a Delta II carrier rocket, flight number D302, flying in the 7925-9.5 configuration. The launch took place from Space Launch Complex 17A at the Cape Canaveral Air Force Station, and placed USA-175 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37FM apogee motor.
By 22 February 2004, USA-175 was in an orbit with a perigee of 20,043 kilometres (12,454 mi), an apogee of 20,319 kilometres (12,626 mi), a period of 717.92 minutes, and 55.1 degrees of inclination to the equator. It is used to broadcast the PRN 22 signal, and operates in slot 2 of plane E of the GPS constellation. The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years. As of 2012 it remains in service.