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Mobile User Objective System (MUOS)
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According to the U.S. Navy:
Mobile User Object System (MUOS) is a narrowband Military Satellite Communications (MILSATCOM) system that supports a worldwide, multi-Service population of mobile and fixed-site terminal users in the Ultra High Frequency (UHF) band, providing increased communications capabilities to smaller terminals while still supporting interoperability to legacy terminals.
MUOS adapts a commercial third generation Wideband Code Division Multiple Access (WCDMA) cellular phone network architecture and combines it with geosynchronous satellites (in place of cell towers) to provide a new and more capable UHF MILSATCOM system. The constellation of four operational satellites and ground network control will provide greater than 10 times the system capacity of the current UHF Follow-On (UFO) constellation.
The first MUOS satellite was launched February 24th, 2012, and began operations in August 2012. The MUOS constellation will eventually be comprised of four GSO satellites and one in-orbit spare. The operational satellites will be located at 177 deg W (Pacific), 100 deg W (CONUS), 15.5 deg W (Atlantic), and 75 deg E (Indian). The spare satellite will be parked at 72 deg E.
The satellites transmit 9.8 W of power into a 14 m dish. The service links are comprised of four 5 MHz-wide SA-WCDMA channels occupying the 20 MHz wide UHF uplink and downlink bands.
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Frequency Bands |
| Band | Use | Service11 | Table |
| 300 - 320 MHz | MUOS service uplink | Mobile-satellite | F |
| 360 - 380 MHz | MUOS service downlink | Mobile-satellite | F |
| 20.2 - 21.2 GHz | MUOS feeder downlink | Fixed-satellite | F |
| 30 - 31 GHz | MUOS feeder uplink | Fixed-satellite | F |
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