| 词条 | USA-91 |
| 释义 |
| name = USA-91 | image = | image_caption = | insignia = | mission_type = Navigation | operator = US Air Force | COSPAR_ID = 1993-032A[1] | SATCAT = 22657[1] | mission_duration = 7.5 years (planned)[3] | spacecraft = | spacecraft_type = GPS Block IIA[3] | manufacturer = Rockwell[3] | launch_mass = {{convert|1816|kg}}[3] | dimensions = | power = | launch_date = {{start-date|13 May 1993, 00:07:00|timezone=yes}} UTC | launch_rocket = {{nowrap|Delta II 7925-9.5,}} D220[7] | launch_site = Cape Canaveral LC-17A[7] | entered_service = | disposal_type = Placed in a graveyard orbit | deactivated = {{end-date|18 March 2016}} | orbit_slot = | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Medium Earth (Semi-synchronous) | orbit_periapsis = {{convert|20033|km}}[9] | orbit_apoapsis = {{convert|20327|km}}[9] | orbit_inclination = 54.9 degrees[9] | orbit_period = 717.88 minutes[9] | apsis = gee }} USA-91, also known as GPS IIA-11, GPS II-20 and GPS SVN-37, was an American navigation satellite which formed part of the Global Positioning System. It was the eleventh of nineteen Block IIA GPS satellites to be launched. USA-91 was launched at 00:07:00 UTC on 13 May 1993, atop a Delta II carrier rocket, flight number D220, flying in the 7925-9.5 configuration.[2] The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station,[3] and placed USA-91 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[4] On 14 June 1993, USA-91 was in an orbit with a perigee of {{convert|20033|km}}, an apogee of {{convert|20327|km}}, a period of 717.88 minutes, and 54.9 degrees of inclination to the equator.[5] It broadcast signal PRN 07, and operated in slot 4 of plane C of the GPS constellation.[6] The satellite had a mass of {{convert|1816|kg}}. It had a design life of 7.5 years,[4] and ceased operations on 20 December 2007. Following decommissioning, it was kept as a reserve satellite. It was finally put in a disposal orbit approximately 1000 km above the operational constellation on March 18, 2016.[7] References1. ^1 {{cite web|url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1993-032A|title=Navstar 2A-11|publisher=US National Space Science Data Center|accessdate=10 July 2012}} {{Portal|Spaceflight}}{{GPS satellites}}{{Orbital launches in 1993}}{{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=10 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=10 July 2012}} 4. ^1 2 3 4 5 {{cite web|url=http://space.skyrocket.de/doc_sdat/navstar-2a.htm|title=GPS-2A (Navstar-2A)|first=Gunter|last=Krebs|work=Gunter's Space Page|accessdate=10 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=10 July 2012}} 6. ^{{cite web|url=http://www.astronautix.com/project/navstar.htm|title=Navstar|publisher=Encyclopedia Astronautica|first=Mark|last=Wade|accessdate=10 July 2012}} 7. ^{{cite web|url=http://www.schriever.af.mil/News/Article-Display/Article/734896/50-sw-to-dispose-of-two-gps-satellites|title=50 SW to dispose of two GPS satellites|publisher=United States Air Force|accessdate=21 March 2016}} 3 : Spacecraft launched in 1993|GPS satellites|USA satellites |
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