OPS 5113

OPS 5113
NamesNavstar 3
GPS I-3
GPS SVN-3
Mission typeNavigation
Technology
OperatorU.S. Air Force
COSPAR ID1978-093A [1]
SATCAT no.11054
Mission duration5 years (planned)
13+1⁄2 years (achieved)
Spacecraft properties
SpacecraftNavstar
Spacecraft typeGPS Block I
ManufacturerRockwell Space Systems[2]
Launch mass758 kg (1,671 lb)
Dimensions5.3 meters of long
Power400 watts
Start of mission
Launch date7 October 1978, 00:28:00 UTC
RocketAtlas F / SGS-1
(Atlas-47F)
Launch siteVandenberg, SLC-3E
ContractorConvair
General Dynamics
Entered service13 November 1978
End of mission
Deactivated18 May 1992
Orbital parameters
Reference systemGeocentric orbit[3]
RegimeMedium Earth orbit
(Semi-synchronous)
Perigee altitude20,285 km (12,605 mi)
Apogee altitude20,312 km (12,621 mi)
Inclination62.80°
Period722.60 minutes
← OPS 5112 (Navstar 2)
OPS 5114 (Navstar 4) →

OPS 5113, also known as Navstar 3, GPS I-3 and GPS SVN-3, was an American navigation satellite launched in 1978 as part of the Global Positioning System development programme. It was the third of eleven Block I GPS satellites to be launched.[2]

Background

Global Positioning System (GPS) was developed by the U.S. Department of Defense to provide all-weather round-the-clock navigation capabilities for military ground, sea, and air forces. Since its implementation, GPS has also become an integral asset in numerous civilian applications and industries around the globe, including recreational used (e.g., boating, aircraft, hiking), corporate vehicle fleet tracking, and surveying. GPS employs 24 spacecraft in 20,200 km circular orbits inclined at 55°. These vehicles are placed in 6 orbit planes with four operational satellites in each plane.[1]

Spacecraft

The first eleven spacecraft (GPS Block 1) were used to demonstrate the feasibility of the GPS system. They were 3-axis stabilized, nadir pointing using reaction wheels. Dual solar arrays supplied over 400 watts. They had S-band communications for control and telemetry and Ultra high frequency (UHF) cross-link between spacecraft. They were manufactured by Rockwell Space Systems, were 5.3 m across with solar panels deployed, and had a design life expectancy of 5 years. Unlike the later operational satellites, GPS Block 1 spacecraft were inclined at 63°.[1]

Launch

OPS 5113 was launched at 00:28 UTC on 7 October 1978, atop an Atlas F launch vehicle with an SGS-1 upper stage. The Atlas used had the serial number 47F, and was originally built as an Atlas F.[4] The launch took place from Space Launch Complex 3E at Vandenberg Air Force Base,[5] and placed OPS 5113 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]

Mission

By 13 November 1978, OPS 5113 was in an orbit with a perigee of 20,285 km (12,605 mi), an apogee of 20,312 km (12,621 mi), a period of 722.60 minutes, and 62.80° of inclination to the equator.[6] The satellite had a design life of 5 years and a mass of 758 kg (1,671 lb).[2] It broadcast the PRN 06 signal in the GPS demonstration constellation, and was retired from service on 18 May 1992.

See also

References

  1. ^ a b c "Display: Navstar 3 1978-093A". NASA. 14 May 2020. Retrieved 21 November 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  2. ^ a b c d Krebs, Gunter. "GPS (Navstar)". Gunter's Space Page. Retrieved 12 July 2012.
  3. ^ "Trajectory: Navstar 3 1978-093A". NASA. 14 May 2020. Retrieved 21 November 2020. Public Domain This article incorporates text from this source, which is in the public domain.
  4. ^ McDowell, Jonathan. "Launch Log". Jonathan's Space Report. Retrieved 12 July 2012.
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Report. Archived from the original on 15 August 2020. Retrieved 12 July 2012.
  6. ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Report. Retrieved 12 July 2012.

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