Inmarsat’s network provides communications services to a range of governments, aid agencies, media outlets and businesses with a need to communicate in remote regions or where there is no reliable terrestrial network. It provides telephone and data services to users worldwide, via portable or mobile terminals which communicate with ground stations through twelve geostationary telecommunications satellites. ![]() Inmarsat plc (LSE: ISAT) is a British satellite telecommunications company, offering global mobile services. As of 2016, Ligado Networks seeks FCC permission for terrestrial deployment of its mid-band spectrum in the 1500 MHz to 1700 MHz range.810 The company plans to make its spectrum available to industry and government to serve emerging Internet of Things and 5G technologies. The LUT ground stations receive information from polar orbiting and geostationary satellites that carry the Search and Rescue Satellite-Aided Tracking (SARSAT) payloads providing distress alert and locations information from Emergency Position-Indicating Radio Beacon (EPIRB) and Emergency Locator Transmitter (ELT) to public safety rescue authorities for maritime, aviation, and land users in distress. Turning it into a GPS-disciplined clock could be. ![]() ![]() The Department of Commerce National Oceanic and Atmospheric Administration (NOAA) operates the Local User Terminal (LUT) ground stations in the 1544-1545 MHz portion of the band. The SDR GPS receiver, without particular attention to timing, has been done here: I had this running a few weeks ago and it works reasonably well. In addition to emergency communications, the Federal agencies operate mobile earth terminals, including aeronautical, land, and maritime, using commercial satellite systems.
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