| 词条 | OPS 5114 |
| 释义 |
| name = OPS 5114 | image = | image_caption = | insignia = | mission_type = Navigation Technology | operator = US Air Force | COSPAR_ID = 1978-112A[1] | SATCAT = 11141[1] | mission_duration = 5 years (planned) 11 years (achieved) | spacecraft = | spacecraft_type = GPS Block I | manufacturer = Rockwell[3] | launch_mass = {{convert|759|kg}}[3] | dimensions = | power = | launch_date = {{start-date|11 December 1978, 03:59|timezone=yes}} UTC | launch_rocket = {{nowrap|Atlas E/F SGS-1,}} 39F[5] | launch_site = Vandenberg SLC-3E[5] | entered_service = | disposal_type = | deactivated = {{end-date|May 1990}} | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Medium Earth (Semi-synchronous) | orbit_periapsis = {{convert|20163|km}}[7] | orbit_apoapsis = {{convert|20201|km}}[7] | orbit_inclination = 63.2 degrees[7] | orbit_period = 717.96 minutes[7] | apsis = gee }}OPS 5114, also known as Navstar 4, GPS I-4 and GPS SVN-4, was an American navigation satellite launched in 1978 as part of the Global Positioning System development programme. It was the fourth of eleven Block I GPS satellites to be launched.[3] LaunchOPS 5114 was launched at 03:59 UTC on 11 December 1978, atop an Atlas E/F carrier rocket with an SGS-1 upper stage. The Atlas used had the serial number 39F, and was originally built as an Atlas F.[2] The launch took place from Space Launch Complex 3E at Vandenberg Air Force Base.[3] OrbitOPS 5114 was placed into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[4] By 1 February 1979, OPS 5114 was in an orbit with a perigee of {{convert|20163|km}}, an apogee of {{convert|20201|km}}, a period of 717.96 minutes, and 63.2 degrees of inclination to the equator.[5] The satellite had a design life of 5 years and a mass of {{convert|758|kg}}.[4] It broadcast the PRN 08 signal in the GPS demonstration constellation, and was retired from service on 14 October 1989. On 20 February 1990 it was reactivated for further testing, before being deactivated again in May 1990. {{Clear}}See also{{Portal|Spaceflight}}
References1. ^1 {{cite web|url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1978-112A|title=Navstar 4|publisher=US National Space Science Data Center|accessdate=25 June 2012}} {{GPS satellites}}{{Orbital launches in 1978}}{{US-spacecraft-stub}}2. ^1 2 {{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|publisher=Jonathan's Space Page|first=Jonathan|last=McDowell|accessdate=12 July 2012}} 3. ^{{cite web |url=http://planet4589.org/space/lvdb/list2.html |title=Launch List |publisher=Jonathan's Space Page |work=Launch Vehicle Database |first=Jonathan |last=McDowell |accessdate=12 July 2012}} 4. ^1 2 3 4 {{cite web|url=http://space.skyrocket.de/doc_sdat/navstar.htm|title=GPS (Navstar)|first=Gunter|last=Krebs|work=Gunter's Space Page|accessdate=12 July 2012}} 5. ^1 2 3 4 {{cite web|url=http://planet4589.org/space/log/satcat.txt|title=Satellite Catalog|publisher=Jonathan's Space Page|first=Jonathan|last=McDowell|accessdate=12 July 2012}} 3 : 1978 in spaceflight|Spacecraft launched in 1978|GPS satellites |
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