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 22,236 miles (35,785 km) 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.
A satellite constellation is a group of artificial satellites working together as a system. Unlike a single satellite, a constellation can provide permanent global or near-global coverage, such that at any time everywhere on Earth at least one satellite is visible. Satellites are typically placed in sets of complementary orbital planes and connect to globally distributed ground stations. They may also use inter-satellite communication.
The Ka band is a portion of the microwave part of the electromagnetic spectrum defined as frequencies in the range 26.5–40 gigahertz (GHz), i.e. wavelengths from slightly over one centimeter down to 7.5 millimeters. The band is called Ka, short for "K-above" because it is the upper part of the original NATO K band, which was split into three bands because of the presence of the atmospheric water vapor resonance peak at 22.24 GHz (1.35 cm), which made the center unusable for long range transmission. The 30/20 GHz band is used in communications satellite uplinks in either the 27.5 GHz or 31 GHz bands, and in high-resolution, close-range targeting radars aboard military airplanes. Some frequencies in this radio band are used for vehicle speed detection by law enforcement. The Kepler Mission used this frequency range to downlink the scientific data collected by the space telescope.
Satellite Internet access is Internet access provided through communication satellites; if it can sustain high speeds, it is termed satellite broadband. Modern consumer grade satellite Internet service is typically provided to individual users through geostationary satellites that can offer relatively high data speeds, with newer satellites using the Ku band to achieve downstream data speeds up to 506 Mbit/s. In addition, new satellite internet constellations are being developed in low-earth orbit to enable low-latency internet access from space.
SES S.A. is a Luxembourgish satellite telecommunications network provider supplying video and data connectivity worldwide to broadcasters, content and internet service providers, mobile and fixed network operators, governments and institutions.
Astra 1E is one of the Astra communications satellites in geostationary orbit owned and operated by SES. It was launched in October 1995 to the Astra 19.2°E orbital slot initially to provide digital television and radio for direct-to-home (DTH) across Europe.
A medium Earth orbit (MEO) is an Earth-centered orbit with an altitude above a low Earth orbit (LEO) and below a high Earth orbit (HEO) – between 2,000 and 35,786 km above sea level.
Astra 5°E is the name for the Astra communications satellites co-located at the 5° east position in the Clarke Belt which are owned and operated by SES based in Betzdorf, Luxembourg. 5° east is one of the major TV satellite positions serving Europe.
O3b Networks Ltd. was a network communications service provider building and operating a medium Earth orbit (MEO) satellite constellation primarily intended to provide voice and data communications to mobile operators and Internet service providers. O3b Networks became a wholly owned subsidiary of SES in 2016 and the operator name was subsequently dropped in favour of SES Networks, a division of SES. The satellites themselves, now part of the SES fleet, continue to use the O3b name.
O3b is a satellite constellation in Medium Earth orbit (MEO) owned and operated by SES, and designed to provide low-latency broadband connectivity to remote locations for mobile network operators and internet service providers, maritime, aviation, and government and defence. It is often referred to as O3b MEO to distinguish these satellites from SES's forthcoming O3b mPOWER constellation.
High Above - The untold story of Astra, Europe's leading satellite companyis a book describing the development of the European satellite provider SES, published in 2010 on the occasion of the company's 25th anniversary by Broadgate Publications in Richmond, London, United Kingdom.
A hosted payload is a module attached to a commercial satellite with communications circuitry that operates independently of the main spacecraft but which shares the satellite's power supply and transponders. The concept has been also been referred to as "piggybacking" or "hitchhiking."
Co-location is the placing of two or more geostationary communications satellites in orbit, in close proximity so that to reception equipment on the ground they 'appear' to occupy a single orbital position. The technique as applied to a group of TV satellites from a single operator was pioneered by SES with the Astra satellites at 19.2°E.
SES-5 is a commercial geostationary communication satellite operated by SES S.A. It was launched on 9 July 2012. The launch was arranged by International Launch Services (ILS).
Even Higher is a book describing the future of TV broadcasting, as predicted by various industry figures.
SES-17, is a high throughput all electric geostationary communications satellite owned and operated by SES S.A., and designed and manufactured by Thales Alenia Space. Launched on 24 October 2021 from Centre Spatial Guyanais (CSG), in Kourou, French Guiana by an Ariane 5ECA launch vehicle, SES-17 was positioned at 67.1° west in May 2022 and, after testing, became fully operational in June 2022.
Soyuz flight VS22 was a rocket launch conducted by multinational launch service provider Arianespace. It was the sixteenth launch of a Soyuz-ST-B launch vehicle, and the 22nd launch of a Soyuz-2 series launch vehicle from the Ensemble de Lancement Soyouz at the Guiana Space Centre. After two scheduling delays and a 33-minute logistical delay, the rocket lifted off on 4 April 2019, and successfully delivered to medium Earth orbit the final four satellites in the O3b broadband satellite constellation, which services Latin America, Africa, and Oceania. After four previous Soyuz flights delivered the constellation's first sixteen satellites, the launch increased the constellation's throughput by 26 per cent. The flight marked the second occasion in which two Soyuz-2 launch vehicles were launched on the same day, occurring hours after the launch of Progress MS-11 from the Baikonur Cosmodrome.
The Directorate-General for Defence Industry and Space is a department of the European Commission.
O3b mPOWER is a communications satellite system owned and operated by SES. The system uses high-throughput and low-latency satellites in a medium Earth orbit (MEO), along with ground infrastructure and intelligent software, to provide multiple terabits of global broadband connectivity for applications including cellular backhaul and international IP trunking, cruise line connectivity, disaster recovery, and military communications. The first O3b mPOWER satellites were launched in December 2022 and the system became operational in April 2024 with 6 satellites. The system's capacity will be increased by a further 7 satellites launched by 2026.
