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| MUOS-4 encapsulated in its protective launch vehicle fairing for its Aug. 31, 2015 launch from Cape Canaveral Air Force Station. United Launch Alliance Photo |
The fourth Mobile User Objective System (MUOS) satellite is set to launch on Aug 31. as part of the $7.8 billion, five satellite network from Cape Canaveral, Fla.
“Delivery of this fourth satellite for the U.S. Navy completes the initial MUOS constellation and provides near-global coverage for the network,” said Iris Bombelyn, vice president of Narrowband Communications at Lockheed Martin, in a press release.
“For our mobile forces, that means for the first time they will be able to have secure, high-fidelity voice conversations, networked team calls and data exchange, including video, with anyone around the world connected with a MUOS terminal.”
MUOS is the planned constellation 1990s era Ultra High Frequency Follow-On (UFO) constellation. The new satellites promise ten times the transfer rates of the UFO net with speeds of up to 384 kbs.
Trouble Integrating Waveform Leaves New MUOS Satellites With Little to Do
WASHINGTON
— The U.S. Navy was forced to postpone the final certification test of
its next-generation mobile satellite communications system to December
2015 because of problems integrating the system’s new radio frequency
waveform with the ground segment and terminals, the service said in
October report sent to lawmakers.
The Navy originally scheduled the so-called multiservice operational test and evaluation of its Mobile User Objective System, or MUOS, for April 2014. In March, Army officials overseeing part of the system told lawmakers that the test would take place in June.
- See more at: http://spacenews.com/42888technical-issues-prompt-us-navy-to-delay-certification-of-muos/#sthash.9BmOGkc4.dpuf
The Navy originally scheduled the so-called multiservice operational test and evaluation of its Mobile User Objective System, or MUOS, for April 2014. In March, Army officials overseeing part of the system told lawmakers that the test would take place in June.
- See more at: http://spacenews.com/42888technical-issues-prompt-us-navy-to-delay-certification-of-muos/#sthash.9BmOGkc4.dpuf
WASHINGTON
— The U.S. Navy was forced to postpone the final certification test of
its next-generation mobile satellite communications system to December
2015 because of problems integrating the system’s new radio frequency
waveform with the ground segment and terminals, the service said in
October report sent to lawmakers.
The Navy originally scheduled the so-called multiservice operational test and evaluation of its Mobile User Objective System, or MUOS, for April 2014. In March, Army officials overseeing part of the system told lawmakers that the test would take place in June.
- See more at: http://spacenews.com/42888technical-issues-prompt-us-navy-to-delay-certification-of-muos/#sthash.9BmOGkc4.dpuf
The Navy originally scheduled the so-called multiservice operational test and evaluation of its Mobile User Objective System, or MUOS, for April 2014. In March, Army officials overseeing part of the system told lawmakers that the test would take place in June.
- See more at: http://spacenews.com/42888technical-issues-prompt-us-navy-to-delay-certification-of-muos/#sthash.9BmOGkc4.dpuf
The U.S. military’s long-standing problem of aligning the deployment of spacecraft with the development of their Earth-bound terminals and ground stations is plaguing the Navy’s powerful new communications satellite system.
The service is having difficulties delivering a waveform known as wideband code division multiple access, which is intended to work with the Mobile User Objective System. MUOS is a constellation of spacecraft intended to provide the military with narrowband tactical communications with secure voice, video and data transfer. They have been called “cell towers in space” for their ability to deliver the kinds of communications consumers expect on Earth.
WCDMA is a 3rd generation wireless communication system developed for terrestrial cellular systems. The Mobile User Objective System (MUOS) uses WCDMA as a basis for its waveform definition, thus exploiting the extensive development of this advanced commercial communications technology. MUOS is, however, a geosatellite system which in certain ways is a vastly different communications environment than the terrestrial cellular environment.
The U.S. Navy was forced to postpone the final certification test of its next-generation mobile satellite communications system to December 2015 because of problems integrating the system’s new radio frequency waveform with the ground segment and terminals, the service said in October report sent to lawmakers.
The Navy originally scheduled the so-called multiservice operational test and evaluation of its Mobile User Objective System, or MUOS, for April 2014. In March, Army officials overseeing part of the system told lawmakers that the test would take place in June.
Three of a planned five-satellite fleet are in orbit, but Cristina T. Chaplain, director of acquisition and sourcing management at the Government Accountability Office, testified before the Senate Armed Services Committee’s strategic forces subcommittee in April that 90 percent of the spacecrafts’ capacity is going unused as problems with the waveform are being worked out.
Related/Background:
- Fourth MUOS Satellite Prepares for Launch - USNI News
- Technical Issues Prompt U.S. Navy To Delay Certification of MUOS
- spendergast: MUOS satellite demonstrates polar communications capability
- Mobile User Objective System (MUOS) · Lockheed Martin
- Home - United Launch Alliance
- Sadowsky, J.S.; Lee, David K., "The MUOS-WCDMA Air Interface," in Military Communications Conference, 2007. MILCOM 2007. IEEE , vol., no., pp.1-6, 29-31 Oct. 2007
doi: 10.1109/MILCOM.2007.4455201
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4455201&isnumber=4454733
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