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171.3°W TDRS-10 (J), GE 2 (174°W) United States NASA: 5 December 2002, Atlas IIA: 171.1°W TDRS-11: United States NASA: 31 January 2013, Atlas V 401: 169.5°W NSS-6: Lockheed Martin A2100AXS: Netherlands SES: Direct broadcasting, video distribution Asia: 17 December 2002 Ariane 44L: Ku-band satellite 167.6°W TDRS-5: United States NASA: 2 ...
How satellite internet works. Satellite Internet generally relies on three primary components: a satellite – historically in geostationary orbit (or GEO) but now increasingly in Low Earth orbit (LEO) or Medium Earth orbit MEO) [24] – a number of ground stations known as gateways that relay Internet data to and from the satellite via radio waves (), and further ground stations to serve each ...
F2 propagation (F2-skip) is the reflection of VHF signals off the F2 layer of the ionosphere. The phenomenon is rare compared to other forms of propagation (such as sporadic E propagation , or E-skip) but can reflect signals thousands of miles beyond their intended broadcast area, substantially farther than E-skip.
The ISPRS International Journal of Geo-Information is a monthly peer-reviewed open-access scientific journal covering geo-information and related topics such as Cartography, geovisualization, and spatial analysis.
ViaSat-3 is a planned global constellation of three geostationary K a-band communications satellites, the first of which was launched in 2023. [1] Operated by Viasat, Inc., the satellites are intended to provide broadband connectivity with speeds of 100-plus megabits per second to homes, business and enterprise internet users, commercial, government and business aircraft, as well as government ...
Anik F2 has lost two of its four thrusters. As a result, continued operation uses significantly more fuel. Telesat has announced [23] that it is acquiring an in-orbit satellite to replace Anik F2. An FCC filing by Telesat has since revealed [24] that the company is buying AMC-11 from SES. Once the FCC has issued its permit, Telesat can take ...
Geovisualization is closely related to other visualization fields, such as scientific visualization [1] and information visualization. [2] Owing to its roots in cartography, geovisualization contributes to these other fields by way of the map metaphor, which "has been widely used to visualize non-geographic information in the domains of information visualization and domain knowledge ...
Principles of geolocation using GPS. Geopositioning is the process of determining or estimating the geographic position of an object or a person. [1] Geopositioning yields a set of geographic coordinates (such as latitude and longitude) in a given map datum.