MUOS-1 = Atlas V 551 - Canaveral SLC-41 - 24.02.12 22:15 UTC

[SpaceR]

Стравливается лишний водород.

Есть предподозрение, что как раз не "лишний", а уже отработанный на захолаживании движка и магистралей.
Кроме того, этот патрубок уж очень напоминает сопло крена.  :roll:

[Ярослав]

Стравливается лишний водород.

Есть предподозрение, что как раз не "лишний", а уже отработанный на захолаживании движка и магистралей.
Кроме того, этот патрубок уж очень напоминает сопло крена.  :roll:

http://www.scribd.com/doc/45970851/Titan-Centaur-NASA-s-Newest-Launch-Vehicle
"turbopump exhaust duct rotates to provide roll control"

[Старый]

"turbopump exhaust duct rotates to provide roll control"

Это где? На RL-10, чтоль?  :shock:

[Ярослав]

"turbopump exhaust duct rotates to provide roll control"

Это где? На RL-10, чтоль?  :shock:

судя по всему, это на версии, которая была сделана для титана.

атласовская версия наверное не сильно отличается

[Sharicoff]

Насколько я понимаю, номера USA-xxx сабжу пока не присвоено?

[Старый]

судя по всему, это на версии, которая была сделана для титана.
атласовская версия наверное не сильно отличается

Судя по всему везде практически одинаковая версия. И везде замкнутая схема. Так что с турбопамп экзостом както не совсем понятно...

[Ярослав]

судя по всему, это на версии, которая была сделана для титана.
атласовская версия наверное не сильно отличается

Судя по всему везде практически одинаковая версия. И везде замкнутая схема. Так что с турбопамп экзостом както не совсем понятно...

посмотрите сей документ
http://www.scribd.com/doc/45970851/Titan-Centaur-NASA-s-Newest-Launch-Vehicle

может я что не понял...

[G.K.]

Насколько я понимаю, номера USA-xxx сабжу пока не присвоено?

да нет вроде, всё тихо-мирно.
Такой вопрос к сообществу: если бы на атлас-551 на ГСО пускали НРОЛ про какую ПН вы бы подумали?

[instml]

Насколько я понимаю, номера USA-xxx сабжу пока не присвоено?

http://space.skyrocket.de/doc_chr/lau2012.htm

Тут он USA-234

Mass: 6740 kg; 3812 kg (dry)

[Sharicoff]

http://space.skyrocket.de/doc_chr/lau2012.htm

Тут он USA-234

Имелись в виду какие-нибудь более официальные источники.

[SpaceR]

судя по всему, это на версии, которая была сделана для титана.
атласовская версия наверное не сильно отличается

Судя по всему везде практически одинаковая версия. И везде замкнутая схема. Так что с турбопамп экзостом както не совсем понятно...

Ну по крену рулить ведь всё равно как-то нужно?
Так чтобы не приплетать сюда дополнительные движки, можно просто взять чуток газа, вращающего турбину, через штуцер и к соплам крена вывести. Такое решение уже давно известно.

[instml]

2012 Feb 24: MUOS-1 Launch on Atlas 5 -- First Stage Forward-looking RocketCam View








2012 Feb 24: MUOS-1 Launch on Atlas 5 -- First Stage Aft-looking RocketCam View


http://www.youtube.com/user/RocketCamByEcliptic/videos

[instml]

U.S. Navy's newly launched spacecraft is flying high

The U.S. Navy's new satellite to provide more agile communications for forces on the move has successfully maneuvered itself into a perch 22,300 miles above Earth and unfurled its giant umbrella-like mesh antennas.
 
Launched by ULA's Atlas 5 rocket on Feb. 24 from Cape Canaveral into a geosynchronous transfer orbit, the Mobile User Objective System 1 satellite has executed eight firings of its liquid apogee main engine to ascend from that dropoff point. The rocket delivered the craft to a preliminary 2,150 by 22,237 statute mile orbit, which has now been circularized, and the inclination was reduced from 19 degrees to about 5 degrees relative to the equator.

Deployment of the craft's power-generating solar arrays has occurred, now spanning more than 90 feet, and the pair of antenna reflectors on boom assemblies took place as planned.

The communications payload carries two gold mesh antennas, built by Harris Corp., to serve legacy-equipment users transmitting through a 17.7-foot-diameter reflector on the bottom of the craft and the advanced, multi-beam features of MUOS to significantly increase the transmission capacity over the Navy's previous satellites through a large 46-foot reflector atop the satellite.

Satellite-builder Lockheed Martin is conducting its checkout of MUOS 1 before handing control to the military for acceptance testing. The craft is scheduled to enter service later this summer.

The Navy has not announced which of five available orbital zones the spacecraft will be operated from -- the vast Pacific Ocean, the continental U.S. coverage area, the Atlantic Ocean region, or two positions over the Indian Ocean and the Middle East. The testing location is over the Pacific in view of ground station in Hawaii.

The expansive footprint of MUOS 1 will cover a huge swath of the planet to serve ships, submarines, aircraft, land vehicles and terminals in the hands of troops.

"The ability for a warfighter to make a telephone call over a MUOS terminal and send data at 10 times more capacity than they can now will be a significant improvement," said Navy Capt. Paul Ghyzel, MUOS program manager.

Four primary satellites and one orbiting spare will comprise the MUOS system as it is fielded over the next few years to augment and then replace the Navy's aging Ultra High Frequency spacecraft constellation.

MUOS utilizes commercial 3G cellular telephone and satellite technology to provide UHF communications through "rugged smartphones" in the hands of troops, unlike the bulky gear needed to talk with the older generation of satellites.

"With MUOS they'll be able to move around the battlespace," said Navy Cmdr. Jeff King, a MUOS systems engineer. "They'll be able to communicate to users on the other side of a mountain or the other side of the world."

http://www.spaceflightnow.com/atlas/av030/geo.html

[интересующийся]

http://www.lockheedmartin.com/us/news/press-releases/2012/june/0618-ss-muos.html

SUNNYVALE, Calif., June 18, 2012 – Lockheed Martin [NYSE] has successfully completed thermal vacuum testing of the U.S. Navy's second Mobile User Objective System (MUOS) satellite, designated MUOS-2.  Completion of this major program milestone validates performance in a simulated space environment and clears the satellite for final integrated system test.

"With the completion of environmental testing, the MUOS team has illustrated its continued focus on successful program execution and mission success," said Lockheed Martin's Global Communications Systems vice president and general manager, Kevin Bilger. "The first MUOS satellite is on-orbit and poised to provide significantly improved communications capabilities for the mobile warfighter. This team looks forward to expanding MUOS capabilities with the launch of the second satellite in the constellation."

Conducted inside Lockheed Martin's Dual Entry Large Thermal Altitude chamber, the MUOS-2 satellite was stressed at extreme hot and cold temperatures, simulating the environments the satellite will experience throughout its mission life. The extensive test-like-you-fly process validates the satellite's overall design and survivability during launch and on-orbit operations.

"Building on the success of the first MUOS satellite, the team completed this critical test phase efficiently and affordably to support our customer's launch schedule," said Mark Pasquale, Lockheed Martin vice president and MUOS program manager. "Our team is on track to successfully complete final satellite integration and test this fall."

The five-satellite MUOS constellation will revolutionize military Ultra High Frequency (UHF) satellite communications by introducing new capabilities to mobile warfighters throughout the world.

The first MUOS satellite launched February 24, 2012, from Cape Canaveral Air Force Station, Fla., and is progressing steadily with on-orbit checkout. The wideband code division multiple access payload provides 16 times the capacity over the existing system, including global connectivity through the Defense Information Systems Network and support services such as full two-way voice and data transfers. The Lockheed Martin-led team is completing satellite validation in preparation for customer handover in June.

The first MUOS satellite and associated ground system will provide initial on-orbit capability this year, followed by the launch of the second spacecraft in 2013. The five-satellite global constellation is expected to achieve full operational capability in 2015, extending UHF narrowband communications availability to the armed forces well past 2025.

The MUOS constellation replaces the legacy Ultra High Frequency Follow-On (UFO) system and provides significantly improved assured communications for mobile warfighters. A single MUOS satellite will provide four times the capacity of the entire UFO constellation of 8 satellites.  Each MUOS satellite also includes a legacy UHF payload that is fully compatible with the current UFO system and legacy terminals.  This dual-payload design ensures a smooth transition to the cutting-edge MUOS technology while the UFO system is phased out.

[Старый]

А есть снимки где было бы видно сложеную большую антену?

[instml]

А есть снимки где было бы видно сложеную большую антену?

http://www.ulalaunch.com/site/PhotoGallery/galleryimages/images/AtlasV/A5_MUOS1/av_muos1_e1.jpg
http://www.ulalaunch.com/site/PhotoGallery/galleryimages/images/AtlasV/A5_MUOS1/av_muos1_e2.jpg
http://www.ulalaunch.com/site/PhotoGallery/galleryimages/images/AtlasV/A5_MUOS1/av_muos1_e3.jpg
http://www.ulalaunch.com/site/PhotoGallery/galleryimages/images/AtlasV/A5_MUOS1/av_muos1_e4.jpg

[Старый]

http://www.ulalaunch.com/site/PhotoGallery/galleryimages/images/AtlasV/A5_MUOS1/av_muos1_e4.jpg

Извиняюсь, ничего не понял. Вот эти две крышки слева это и есть большая антена?

[instml]

Большая антенна сверху

[Старый]

Большая антенна сверху

Неее! Сверху это её облучатель. А антена сложена гдето сбоку.

[Старый]

Вот антена развёрнута: