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MSAT
MSAT (Mobile Satellite) is a satellite-based mobile telephony service developed by the National Research Council Canada (NRC). Supported by a number of companies in the US and Canada, MSAT hosts a number of services, including the broadcast of CDGPS signals. The MSAT satellites were built by Hughes (now owned by Boeing) with a 3 kilowatt solar array power capacity and sufficient fuel for a design life of twelve years. TMI Communications of Canada referred to its MSAT satellite as MSAT-1, while American Mobile Satellite Consortium (now Ligado Networks) referred to its MSAT as AMSC-1, with each satellite providing backup for the other. History * April 7, 1995 - MSAT-2 (a.k.a. AMSC-1, COSPAR 1995-019A, SATCAT 23553) launched from Cape Canaveral, Launch Complex 36, Pad A, aboard Atlas IIA * May 1995 - testing causes overheating and damage to one of eight hybrid matrix amplifier output ports aboard MSAT-2 * April 20, 1996 - MSAT-1 (sometimes AMSC 2, COSPAR 1996-022A, SATCAT 23846) l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LightSquared
Ligado Networks, formerly known as LightSquared, is an American satellite communications company. After restructuring, emerging from bankruptcy and modifying its network plan, the new company, Ligado Networks, launched in 2016. It operates the SkyTerra 1 satellite. Operations Ligado Networks is based in Reston, Virginia. The company is governed by a seven-member board of directors with Ivan Seidenberg as Chairman and Doug Smith as president and CEO. Fortress Investment Group, LLC, Centerbridge Partners LP and JPMorgan Chase & Co. own controlling stakes in Ligado Networks; Harbinger Capital Partners maintains a minority stake. Ligado Networks has 40 MHz of spectrum licenses in the nationwide block of 1500 MHz to 1700 MHz spectrum in the L-Band. With it, the company is developing a satellite-terrestrial network to support the emerging 5G market and Internet of Things applications. Network and spectrum The company (as LightSquared) reached a cooperation agre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SkyTerra
SkyTerra (SKYT), formerly Mobile Satellite Ventures (MSV or MSVLP), was a Reston, Virginia company that developed telecommunications systems that integrate satellite and terrestrial radio communication technologies into one system. In March 2010, the company was acquired by Harbinger Capital Partners and under the leadership of CEO Sanjiv Ahuja became part of a new company called LightSquared. The company placed its first satellite, SkyTerra-1, in orbit on November 14, 2010. LightSquared has since then went bankrupt and emerged from bankruptcy as Ligado Networks. History The Corporation was founded in 1988 as American Mobile Satellite Corporation (AMSC), a consortium of several organizations originally dedicated to satellite broadcasting of telephone, fax, and data signals. Its acquisition of ARDIS was completed on March 31, 1998. On April 24, 2000, the company changed its name to Motient Corporation, with its stock traded on the NASDAQ National Market under the symbol "MTNT". ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellites
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. Many communications satellites are in geostationary orbit above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite. Others form satellite constellations in low Earth orbit, where antennas on the ground have to follow the position of the satellites and switch between satellites frequently. The radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications satellites is to re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite Phone
A satellite telephone, satellite phone or satphone is a type of mobile phone that connects to other phones or the telephone network by radio link through satellites orbiting the Earth instead of terrestrial cell sites, as cellphones do. Therefore, they can work in most geographic locations on the Earth's surface, as long as open sky and the line-of-sight between the phone and the satellite are provided. Depending on the architecture of a particular system, coverage may include the entire Earth or only specific regions. Satellite phones provide similar functionality to terrestrial mobile telephones; voice calling, text messaging, and low-bandwidth Internet access are supported through most systems. The advantage of a satellite phone is that it can be used in such regions where local terrestrial communication infrastructures, such as landline and cellular networks, are not available. Satellite phones are popular on expeditions into remote locations where there is no reliable ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobile-satellite Service
Mobile-satellite service (MSS, or mobile-satellite radiocommunication service) is – according to Article 1.25 of the International Telecommunication Union's Radio Regulations – "A radiocommunication service * between mobile earth stations and one or more space stations, or between space stations used by this service; or * between mobile earth stations by means of one or more space stations. This service may also include feeder links necessary for its operation." Details Most commercial voice and some data mobile satellite services are provided by systems operating in the L-band by Iridium, Inmarsat, Globalstar and Thuraya. The L-band spectrum allocated for MSS is between 1.5 and 2.5 GHz, with the upper portion often referred to as the S-band. Constellations of low earth orbiting (LEO) satellites are used by Iridium (66 satellites) and Globalstar (48 satellites). Inmarsat and Thuraya currently use 4 (i4) and 2 geostationary satellites respectively, their L-band services ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inclined Orbit
A satellite is said to occupy an inclined orbit around Earth if the orbit exhibits an angle other than 0° to the equatorial plane. This angle is called the orbit's inclination. A planet is said to have an inclined orbit around the Sun if it has an angle other than 0° to the ecliptic plane. Types of inclined orbits Geosynchronous orbits A geosynchronous orbit is an inclined orbit with an altitude of that completes one revolution every sidereal day tracing out a small figure-eight shape in the sky. A geostationary orbit is a special case of geosynchronous orbit with no inclination, and therefore no apparent movement across the sky from a fixed observation point on the Earth's surface. Due to their inherent instability, geostationary orbits will eventually become inclined if they are not corrected using thrusters. At the end of the satellite's lifetime, when fuel approaches depletion, satellite operators may decide to omit these expensive manoeuvres to correct inclination ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glentel
Glentel Inc. is a Canadian telecommunications retailer based in Burnaby, British Columbia, jointly owned by BCE Inc. and Rogers Communications. In Canada, the company operates over 350 wireless outlets under the Tbooth Wireless (La cabine T sans-fil in Quebec, formerly The Telephone Booth) and WirelessWave (Wave sans fil in Quebec) brands, particularly in mall kiosks. The company operates store-within-a-store kiosks at Canadian Costco locations under the Wireless etc. banner. Glentel outlets sell services from Bell Mobility and Rogers Wireless, their respective subsidiary brands (such as Chatr Wireless, Fido, Lucky Mobile, and Virgin Plus), and SaskTel in Saskatchewan. For a time, it operated the Target Mobile kiosks at Target Canada locations until the chain's closure in 2015, and owned the Australian wireless retail chain Allphones, and U.S. Verizon retailers Diamond Wireless and Wireless Zone. On November 28, 2014, BCE Inc. announced that it would acquire Glentel for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SkyWave Mobile Communications
SkyWave Mobile Communications is a global provider of satellite and satellite-cellular devices in the Machine-to-Machine (M2M) market. Skywave products help customers track, monitor and control industrial vehicles, vessels and industrial equipment. Applications include: tracking the location of vehicle fleets, monitoring data from oil and gas meters, and automated flow pumps. SkyWave's satellite products communicate via Inmarsat's global satellite service. The products are mainly used in the transportation, maritime, mining, oil and gas, heavy equipment, emergency management, water monitoring, and utilities sectors. History SkyWave Mobile Communications was founded in Ottawa, Ontario, Canada in 1997. In its initial stages SkyWave relied on the research and technical expertise provided by the Communications Research Centre Canada (CRC) and local government funding services to develop the first product. Some examples of SkyWave products in use include theft-prevention security ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite
A satellite or an artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation ( GPS), broadcasting, scientific research, and Earth observation. Additional military uses are reconnaissance, early warning, signals intelligence and, potentially, weapon delivery. Other satellites include the final rocket stages that place satellites in orbit and formerly useful satellites that later become defunct. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioisotope thermoelectric generators (RTGs). Most satellites also have a method of communication to ground stations, called transponders. Many satellites use a standardized bus to save cost and work, the most popular of which are small CubeSats. Similar satellites can work together as groups, forming constellatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobile Telephony
Mobile telephony is the provision of wireless telephone services to mobile phones, distinguishing it from fixed-location telephony provided via landline phones. Traditionally, telephony specifically refers to voice communication, though the distinction has become less clear with the integration of additional features such as text messaging and data services. Modern mobile phones connect to a terrestrial cellular network of base stations (commonly referred to as cell sites), using radio waves to facilitate communication. Satellite phones use wireless links to orbiting satellites, providing an alternative in areas lacking local terrestrial communication infrastructure, such as landline and cellular networks. Cellular networks, satellite networks, and landline systems are all linked to the public switched telephone network (PSTN), enabling calls to be made to and from nearly any telephone worldwide. As of 2010, global estimates indicated approximately five billion mobile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
