Satellite Internet access

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Satellite Internet
)
A WildBlue satellite dish on the side of a house for receiving Internet

Satellite Internet access is

Mbit/s.[2] In addition, new satellite internet constellations are being developed in low-earth orbit to enable low-latency
internet access from space.

History

Following the launch of the first satellite, Sputnik 1, by the Soviet Union in October 1957, the US successfully launched the Explorer 1 satellite in 1958. The first commercial communications satellite was Telstar 1, built by Bell Labs and launched in July 1962.

The idea of a

Hughes Aircraft for NASA and launched on August 19, 1963. Succeeding generations of communications satellites featuring larger capacities and improved performance characteristics were adopted for use in television delivery, military applications and telecommunications purposes. Following the invention of the Internet
and the World Wide Web, geostationary satellites attracted interest as a potential means of providing Internet access.

A significant enabler of satellite-delivered Internet has been the opening up of the

WildBlue
.

Among prominent aspirants in the early-stage satellite Internet sector was

Iridium Communications Inc. and Globalstar, dampened marketplace enthusiasm for satellite Internet development. The first Internet-ready satellite for consumers was launched in September 2003.[4]

In 2004, with the launch of

In 2013 the first four satellites of the O3b constellation were launched into medium Earth orbit (MEO) to provide internet access to the "other three billion" people without stable internet access at that time. Over the next six years, 16 further satellites joined the constellation, now owned and operated by SES.[6]

Since 2014, a rising number of companies announced working on internet access using

Amazon all planned to launch more than 1000 satellites each. OneWeb alone raised $1.7 billion by February 2017 for the project,[7] and SpaceX raised over one billion in the first half of 2019 alone for their service called Starlink[8] and expected more than $30 billion in revenue by 2025 from its satellite constellation.[9][10] Starlink, as of February 2024, has 5,402 operational satellites in orbit.[11]

Many planned constellations employ laser communication for inter-satellite links to effectively create a space-based internet backbone.

In September 2017, SES announced the next generation of O3b satellites and service, named O3b mPOWER. The constellation of 11 MEO satellites will deliver 10 terabits of capacity globally through 30,000 spot beams for broadband internet services. The first two O3b mPOWER satellites launched in December 2022, with nine more scheduled for deployment in 2023-2024 and the initial service start expected in Q3 2023.[12][13]

As of 2017, airlines such as

Delta and American have been introducing satellite internet as a means of combating limited bandwidth on airplanes and offering passengers usable internet speeds.[14]

Companies and market

United States

Companies providing home internet service in the United States of America include

European Union

The EU plans to commence the IRIS² project in the 2020s.[16]

China

As of 2023, China is in the process of developing its own, state-owned, satellite internet constellation, run by Chinasat.[17]

India

India’s main offering in the space is developed by Jio and is called JioSpaceFiber. It was unveiled at the 2023 India Mobile Congress.[18] And is as of 2023, entertaining licenses for Starlink and Project Kuiper.[19]

Function

How satellite internet works.

Satellite Internet generally relies on three primary components: a satellite – historically in

network operations centre (NOC) for monitoring the entire system. Working in concert with a broadband gateway, the satellite operates a Star network
topology where all network communication passes through the network's hub processor, which is at the centre of the star. With this configuration, the number of ground stations that can be connected to the hub is virtually limitless.

Satellite

Marketed as the centre of the new broadband satellite networks are a new generation of high-powered GEO satellites positioned 35,786 kilometres (22,236 mi) above the equator, operating in Ka-band (18.3–30 GHz) mode.[21] These new purpose-built satellites are designed and optimized for broadband applications, employing many narrow spot beams,[22] which target a much smaller area than the broad beams used by earlier communication satellites. This spot beam technology allows satellites to reuse assigned bandwidth multiple times which can enable them to achieve much higher overall capacity than conventional broad beam satellites. The spot beams can also increase performance and consequential capacity by focusing more power and increased receiver sensitivity into defined concentrated areas. Spot beams are designated as one of two types: subscriber spot beams, which transmit to and from the subscriber-side terminal, and gateway spot beams, which transmit to/from a service provider ground station. Note that moving off the tight footprint of a spotbeam can degrade performance significantly. Also, spotbeams can make the use of other significant new technologies impossible, including 'Carrier in Carrier' modulation.

In conjunction with the satellite's spot-beam technology, a bent-pipe architecture has traditionally been employed in the network in which the satellite functions as a bridge in space, connecting two communication points on the ground. The term "bent-pipe" is used to describe the shape of the data path between sending and receiving antennas, with the satellite positioned at the point of the bend. Simply put, the satellite's role in this network arrangement is to relay signals from the end user's terminal to the ISP's gateways, and back again without processing the signal at the satellite. The satellite receives, amplifies, and redirects a carrier on a specific radio frequency through a signal path called a transponder.[23]

Some satellite constellations in LEO such as Starlink and the proposed Telesat constellation will employ laser communication equipment for high-throughput optical inter-satellite links. The interconnected satellites allow for direct routing of user data from satellite to satellite and effectively create a space-based optical mesh network that will enable seamless network management and continuity of service.[24]

The satellite has its own set of antennas to receive communication signals from Earth and to transmit signals to their target location. These antennas and transponders are part of the satellite's "payload", which is designed to receive and transmit signals to and from various places on Earth. What enables this transmission and reception in the payload transponders is a repeater subsystem (RF (radio frequency) equipment) used to change frequencies, filter, separate, amplify and group signals before routing them to their destination address on Earth. The satellite's high-gain receiving antenna passes the transmitted data to the transponder which filters, translates and amplifies them, then redirects them to the transmitting antenna on board. The signal is then routed to a specific ground location through a channel known as a carrier. Beside the payload, the other main component of a communications satellite is called the bus, which comprises all equipment required to move the satellite into position, supply power, regulate equipment temperatures, provide health and tracking information, and perform numerous other operational tasks.[23]

Gateways

Along with dramatic advances in satellite technology over the past decade, ground equipment has similarly evolved, benefiting from higher levels of integration and increasing processing power, expanding both capacity and performance boundaries. The Gateway—or Gateway Earth Station (its full name)—is also referred to as a ground station, teleport or hub. The term is sometimes used to describe just the antenna dish portion, or it can refer to the complete system with all associated components. In short, the gateway receives radio wave signals from the satellite on the last leg of the return or upstream payload, carrying the request originating from the end-user's site. The satellite modem at the gateway location demodulates the incoming signal from the outdoor antenna into IP packets and sends the packets to the local network. Access server/gateways manage traffic transported to/from the Internet. Once the initial request has been processed by the gateway's servers, sent to and returned from the Internet, the requested information is sent back as a forward or downstream payload to the end-user via the satellite, which directs the signal to the subscriber terminal. Each Gateway provides the connection to the Internet backbone for the gateway beam(s) it serves. The system of gateways comprising the satellite ground system provides all network services for satellite and corresponding terrestrial connectivity. Each gateway provides a multiservice access network for subscriber terminal connections to the Internet. In the continental United States, because it is north of the equator, all gateway and subscriber dish antenna must have an unobstructed view of the southern sky. Because of the satellite's geostationary orbit, the gateway antenna can stay pointed at a fixed position.

Antenna dish and modem

For the customer-provided equipment (i.e. PC and router) to access the broadband satellite network, the customer must have additional physical components installed:

Outdoor unit (ODU)

At the far end of the outdoor unit is typically a small (2–3-foot, 60–90 cm diameter), reflective dish-type radio antenna. The VSAT antenna must also have an unobstructed view of the sky to allow for proper

line-of-sight
(L-O-S) to the satellite. There are four physical characteristic settings used to ensure that the antenna is configured correctly at the satellite, which are: azimuth, elevation, polarization, and skew. The combination of these settings gives the outdoor unit a L-O-S to the chosen satellite and makes data transmission possible. These parameters are generally set at the time the equipment is installed, along with a beam assignment (Ka-band only); these steps must all be taken prior to the actual activation of service. Transmit and receive components are typically mounted at the focal point of the antenna which receives/sends data from/to the satellite. The main parts are:

  • Feed – This assembly is part of the VSAT receive and transmit chain, which consists of several components with different functions, including the feed horn at the front of the unit, which resembles a funnel and has the task of focusing the satellite microwave signals across the surface of the dish reflector. The feed horn both receives signals reflected off the dish's surface and transmits outbound signals back to the satellite.
  • Block upconverter (BUC) – This unit sits behind the feed horn and may be part of the same unit, but a larger (higher wattage) BUC could be a separate piece attached to the base of the antenna. Its job is to convert the signal from the modem to a higher frequency and amplify it before it is reflected off the dish and towards the satellite.
  • Low-noise block downconverter (LNB) – This is the receiving element of the terminal. The LNB's job is to amplify the received satellite radio signal bouncing off the dish and filter out the noise, which is any signal not carrying valid information. The LNB passes the amplified, filtered signal to the satellite modem at the user's location.

Indoor unit (IDU)

The satellite modem serves as an interface between the outdoor unit and customer-provided equipment (i.e. PC, router) and controls satellite transmission and reception. From the sending device (computer, router, etc.) it receives an input bitstream and converts or modulates it into radio waves, reversing that order for incoming transmissions, which is called demodulation. It provides two types of connectivity:

  • Coaxial cable (COAX) connectivity to the satellite antenna. The cable carrying electromagnetic satellite signals between the modem and the antenna generally is limited to be no more than 150 feet in length.
  • Ethernet connectivity to the computer, carrying the customer's data packets to and from the Internet content servers.

Consumer grade satellite modems typically employ either the DOCSIS or WiMAX telecommunication standard to communicate with the assigned gateway.

Challenges and limitations

Signal latency

Latency (commonly referred to as "ping time") is the delay between requesting data and the receipt of a response, or in the case of one-way communication, between the actual moment of a signal's broadcast and the time it is received at its destination.

A radio signal takes about 120 milliseconds to reach a geostationary satellite and then 120 milliseconds to reach the ground station, so nearly 1/4 of a second overall. Typically, during perfect conditions, the physics involved in satellite communications account for approximately 550 milliseconds of latency round-trip time.

The longer latency is the primary difference between a standard terrestrial-based network and a geostationary satellite-based network. The round-trip latency of a geostationary satellite communications network can be more than 12 times that of a terrestrial based network.[25][26]

Satellite latency can be detrimental to especially time-sensitive applications such as on-line gaming (although it only seriously affects the likes of

simplex
operation (one-way transmission) and latency is not a critical factor for video transmission.

The effects of this delay may be mitigated using data compression, TCP-acceleration, and HTTP pre-fetching.[28]

Geostationary orbits

A geostationary orbit (or geostationary Earth orbit/GEO) is a geosynchronous orbit directly above the Earth's equator (0° latitude), with a period equal to the Earth's rotational period and an orbital eccentricity of approximately zero (i.e. a "circular orbit"). An object in a geostationary orbit appears motionless, at a fixed position in the sky, to ground observers. Launchers often place communications satellites and weather satellites in geostationary orbits, so that the satellite antennas that communicate with them do not have to move to track them, but can point permanently at the position in the sky where the satellites stay. Due to the constant 0° latitude and circularity of geostationary orbits, satellites in GEO differ in location by longitude only.

Compared to ground-based communication, all geostationary satellite communications experience higher latency due to the signal having to travel

35,786 km (22,236 mi) to a satellite in geostationary orbit and back to Earth again. Even at the speed of light (about 300,000 km/s or 186,000 miles per second), this delay can appear significant. If all other signaling delays could be eliminated, it still takes a radio signal about 250 milliseconds (ms), or about a quarter of a second, to travel to the satellite and back to the ground.[29] The absolute minimum total amount of delay varies, due to the satellite staying in one place in the sky, while ground-based users can be directly below (with a roundtrip latency of 239.6 ms), or far to the side of the planet near the horizon (with a roundtrip latency of 279.0 ms).[30]

For an Internet packet, that delay is doubled before a reply is received. That is the theoretical minimum. Factoring in other normal delays from network sources gives a typical one-way connection latency of 500–700 ms from the user to the ISP, or about 1,000–1,400 ms latency for the total round-trip time (RTT) back to the user. This is more than most dial-up users experience at typically 150–200 ms total latency, and much higher than the typical 15–40 ms latency experienced by users of other high-speed Internet services, such as

For geostationary satellites, there is no way to eliminate latency, but the problem can be somewhat mitigated in Internet communications with

TCP acceleration
features that shorten the apparent round trip time (RTT) per packet by splitting ("spoofing") the feedback loop between the sender and the receiver. Certain acceleration features are often present in recent technology developments embedded in satellite Internet equipment.

Latency also impacts the initiation of secure Internet connections such as

SaaS
applications as well as in other forms of online work.

Functions like live interactive access to a distant computer—such as virtual private networks can be affected by the high latency. Many TCP protocols were not designed to work in high-latency environments.

Medium and Low Earth Orbits

Medium Earth orbit (MEO) and low Earth orbit (LEO) satellite constellations do not have such long delays, as the satellites are closer to the ground. For example:

  • The current LEO constellations of
    Iridium
    satellites have delays of less than 40 ms round trip, but their throughput is less than broadband at 64 kbit/s per channel. The Globalstar constellation orbits 1,420 km above the Earth and Iridium orbits at 670 km altitude.
  • The O3b constellation orbits at 8,062 km, with RTT latency of approximately 125 ms.[33] The network is also designed for much higher throughput with links well in excess of 1 Gbit/s (Gigabits per second). The forthcoming O3b mPOWER constellation shares the same orbit and will deliver from 50Mbps to multiple gigabits per second to a single user.[34]
  • A study in 2021 showed that the Starlink satellites orbit at 550 km altitude, with an average RTT latency of 45 ms.[35] Another study in 2022 showed that the latency of the Starlink network is 1.8 ms to 22.8 ms more than the latency of terrestrial networks according to a measurement study conducted in the Metro Vancouver area. [36] Note that the exact measurement results can differ as the deployment of Starlink infrastructure varies across time and locations.

Unlike geostationary satellites, LEO and MEO satellites do not stay in a fixed position in the sky and from a lower altitude they can "see" a smaller area of the Earth, and so continuous widespread access requires a constellation of many satellites (low-Earth orbits needing more satellites than medium-Earth orbits) with complex constellation management to switch data transfer between satellites and keep the connection to a customer, and tracking by the ground stations.[20][37]

MEO satellites require higher power transmissions than LEO to achieve the same signal strength at the ground station but their higher altitude also provides less orbital overcrowding, and their slower orbit speed reduces both Doppler shift and the size and complexity of the constellation required.[38][39]

Tracking of the moving satellites is usually undertaken in one of three ways, using:

  • more diffuse or completely omnidirectional ground antennas capable of communicating with one or more satellites visible in the sky at the same time, but at significantly higher transmit power than fixed geostationary dish antennas (due to the lower gain), and with much poorer signal-to-noise ratios for receiving the signal
  • motorized antenna mounts with high-gain, narrow beam antennas tracking individual satellites
  • phased array antennas that can steer the beam electronically, together with software that can predict the path of each satellite in the constellation.

In May 2022, Kazakhstani mobile network operator, Kcell, and satellite owner and operator, SES used SES's O3b MEO satellite constellation to demonstrate that MEO satellites could be used to provide high-speed mobile internet to remote regions of Kazakhstan for reliable video calling, conferencing and streaming, and web browsing, with a latency five times lower than on the existing platform based on geostationary orbit satellites.[40][41]

Ultralight atmospheric aircraft as satellites

A proposed alternative to relay satellites is a special-purpose

high altitude platform stations
aircraft, which would fly along a circular path above a fixed ground location, operating under autonomous computer control at a height of approximately 20,000 meters.

For example, the United States

Vulture project envisaged an ultralight aircraft capable of station-keeping over a fixed area for a period of up to five years, and able to provide both continuous surveillance to ground assets as well as to service extremely low-latency communications networks.[42] This project was cancelled in 2012 before it became operational.[citation needed
]

Onboard batteries would charge during daylight hours through solar panels covering the wings and would provide power to the plane during night. Ground-based satellite internet dishes would relay signals to and from the aircraft, resulting in a greatly reduced round-trip signal latency of only 0.25 milliseconds. The planes could potentially run for long periods without refueling. Several such schemes involving various types of aircraft have been proposed in the past.

Interference

Bigpond
satellite Internet dish

Satellite communications are affected by moisture and various forms of precipitation (such as rain or snow) in the signal path between end users or ground stations and the satellite being utilized. This interference with the signal is known as rain fade. The effects are less pronounced on the lower frequency 'L' and 'C' bands but can become quite severe on the higher frequency 'Ku' and 'Ka' band. For satellite Internet services in tropical areas with heavy rain, use of the C band (4/6 GHz) with a circular polarisation satellite is popular.[43] Satellite communications on the Ka band (19/29 GHz) can use special techniques such as large rain margins, adaptive uplink power control and reduced bit rates during precipitation.

Rain margins are the extra communication link requirements needed to account for signal degradations due to moisture and precipitation, and are of acute importance on all systems operating at frequencies over 10 GHz.[44]

The amount of time during which service is lost can be reduced by increasing the size of the satellite communication dish so as to gather more of the satellite signal on the downlink and also to provide a stronger signal on the uplink. In other words, increasing antenna gain through the use of a larger parabolic reflector is one way of increasing the overall channel gain and, consequently, the signal-to-noise (S/N) ratio, which allows for greater signal loss due to rain fade without the S/N ratio dropping below its minimum threshold for successful communication.

Modern consumer-grade dish antennas tend to be fairly small, which reduces the rain margin or increases the required satellite downlink power and cost. However, it is often more economical to build a more expensive satellite and smaller, less expensive consumer antennas than to increase the consumer antenna size to reduce the satellite cost.

Large commercial dishes of 3.7 m to 13 m diameter can be used to achieve increased rain margins and also to reduce the cost per bit by allowing for more efficient modulation codes. Alternately, larger aperture antennae can require less power from the satellite to achieve acceptable performance. Satellites typically use

photovoltaic
solar power, so there is no expense for the energy itself, but a more powerful satellite will require larger, more powerful solar panels and electronics, often including a larger transmitting antenna. The larger satellite components not only increase materials costs but also increase the weight of the satellite, and in general, the cost to launch a satellite into an orbit is directly proportional to its weight. (In addition, since satellite launch vehicles [i.e. rockets] have specific payload size limits, making parts of the satellite larger may require either more complex folding mechanisms for parts of the satellite like solar panels and high-gain antennas, or upgrading to a more expensive launch vehicle that can handle a larger payload.)

Modulated carriers can be dynamically altered in response to rain problems or other link impairments using a process called adaptive coding and modulation, or "ACM". ACM allows the bit rates to be increased substantially during normal clear sky conditions, increasing the number of bits per Hz transmitted, and thus reducing overall cost per bit. Adaptive coding requires some sort of a return or feedback channel which can be via any available means, satellite or terrestrial.

Line of sight

Fresnel zone. D is the distance between the transmitter and the receiver, r is the radius of the Fresnel zone.

Two objects are said to be within line of sight if a straight line between the objects can be connected without any interference, such as a mountain. An object beyond the horizon is below the line of sight and, therefore, can be difficult to communicate with.

Typically a completely clear line of sight between the dish and the satellite is required for the system to work optimally. In addition to the signal being susceptible to absorption and scattering by moisture, the signal is similarly impacted by the presence of trees and other vegetation in the path of the signal. As the radio frequency decreases, to below 900 MHz, penetration through vegetation increases, but most satellite communications operate above 2 GHz making them sensitive to even minor obstructions such as tree foliage. A dish installation in the winter must factor in plant foliage growth that will appear in the spring and summer.

Fresnel zone

Even if there is a direct line of sight between the transmitting and receiving antenna, reflections from objects near the path of the signal can decrease apparent signal power through phase cancellations. Whether and how much signal is lost from a reflection is determined by the location of the object in the Fresnel zone of the antennas.

Two-way satellite-only communication

The back panel of a satellite modem, with coaxial connections for both incoming and outgoing signals, and an Ethernet port for connection

Home or consumer grade two-way satellite Internet service involves both sending and receiving data from a remote

telecommunications port
(teleport), which then relays data via the terrestrial Internet. The satellite dish at each location must be precisely pointed to avoid interference with other satellites. At each VSAT site the uplink frequency, bit rate and power must be accurately set, under control of the service provider hub.

There are several types of two-way satellite Internet services, including

VSAT terminals with a 60–100 cm dish and output power of only a few watts intended for consumers and small business or larger systems that provide more bandwidth. Such systems are frequently marketed as "satellite broadband" and can cost two to three times as much per month as land-based systems such as ADSL. The modems
required for this service are often proprietary, but some are compatible with several different providers. They are also expensive, costing in the range of US$600 to $2000.

The two-way "iLNB" used on the SES Broadband.

The two-way "iLNB" used on the SES Broadband terminal dish has a transmitter and single-polarity receive LNB, both operating in the Ku band. Pricing for SES Broadband modems range from €299 to €350. These types of system are generally unsuitable for use on moving vehicles, although some dishes may be fitted to an automatic pan and tilt mechanism to continuously re-align the dish—but these are more expensive. The technology for SES Broadband was delivered by a Belgian company called Newtec.

Bandwidth

Consumer satellite Internet customers range from individual home users with one PC to large remote business sites with several hundred PCs.

Home users tend to use shared satellite capacity to reduce the cost, while still allowing high peak bit rates when congestion is absent. There are usually restrictive time-based bandwidth allowances so that each user gets their fair share, according to their payment. When a user exceeds their allowance, the company may slow down their access, deprioritise their traffic or charge for the excess bandwidth used. For consumer satellite Internet, the allowance can typically range from 200 MB per day to 25 GB per month.[45][46][47] A shared download carrier may have a bit rate of 1 to 40 Mbit/s and be shared by up to 100 to 4,000 end users.

The uplink direction for shared user customers is normally time-division multiple access (TDMA), which involves transmitting occasional short packet bursts in between other users (similar to how a cellular phone shares a cell tower).

Each remote location may also be equipped with a telephone modem; the connections for this are as with a conventional dial-up ISP. Two-way satellite systems may sometimes use the modem channel in both directions for data where latency is more important than bandwidth, reserving the satellite channel for download data where bandwidth is more important than latency, such as for file transfers.

In 2006, the European Commission sponsored the UNIC Project which aimed to develop an end-to-end scientific test bed for the distribution of new broadband interactive TV-centric services delivered over low-cost two-way satellite to actual end-users in the home.[48] The UNIC architecture employs DVB-S2 standard for downlink and DVB-RCS standard for uplink.

Normal VSAT dishes (1.2–2.4 m diameter) are widely used for VoIP phone services. A voice call is sent by means of packets via the satellite and Internet. Using coding and compression techniques the bit rate needed per call is only 10.8 kbit/s each way.

Portable satellite Internet

Portable satellite modem

Portable Satellite Internet Modem and Antenna deployed with the Red Cross in South Sudan in 2014.

These usually come in the shape of a self-contained flat rectangular box that needs to be pointed in the general direction of the satellite—unlike VSAT the alignment need not be very precise and the modems have built in signal strength meters to help the user align the device properly. The modems have commonly used connectors such as

INMARSAT now offer the IsatHub, a paperback book sized satellite modem working in conjunction with the users mobile phone and other devices. The cost has been reduced to $3 per MB and the device itself is on sale for about $1300.[49]

Using such a modem is extremely expensive—data transfer costs between $5 and $7 per megabyte. The modems themselves are also expensive, usually costing between $1,000 and $5,000.[50]

Internet via satellite phone

For many years[

dial-up connection is required and is billed per minute, however both Globalstar and Iridium are planning to launch new satellites offering always-on data services at higher rates. With Thuraya phones the 9,600 bit/s dial-up connection is also possible, the 60 kbit/s service is always-on and the user is billed for data transferred (about $5 per megabyte). The phones can be connected to a laptop or other computer using a USB or RS-232 interface. Due to the low bandwidths involved it is extremely slow to browse the web with such a connection, but useful for sending email, Secure Shell data and using other low-bandwidth protocols. Since satellite phones tend to have omnidirectional antennas
no alignment is required as long as there is a line of sight between the phone and the satellite.

One-way receive, with terrestrial transmit

One-way terrestrial return satellite Internet systems are used with conventional dial-up Internet access, with outbound (upstream) data traveling through a telephone modem, but downstream data sent via satellite at a higher rate. In the U.S., an FCC license is required for the uplink station only; no license is required for the users.

Another type of 1-way satellite Internet system uses

Enhanced Data Rates for GSM Evolution (EDGE), costs are reduced for higher effective rates if the upload volume is very low, and also because this service is not per-time charged, but charged by volume uploaded. GPRS as return improves mobility when the service is provided by a satellite that transmits in the field of 100-200 kW.[citation needed] Using a 33 cm wide satellite dish, a notebook and a normal GPRS equipped GSM phone
, users can get mobile satellite broadband.

System components

The transmitting station has two components, consisting of a high-speed Internet connection to serve many customers at once, and the satellite uplink to broadcast requested data to the customers. The ISP's routers connect to proxy servers which can enforce quality of service (QoS) bandwidth limits and guarantees for each customer's traffic.

Often, nonstandard IP stacks are used to address the latency and asymmetry problems of the satellite connection. As with one-way receive systems, data sent over the satellite link is generally also encrypted, as otherwise it would be accessible to anyone with a satellite receiver.

Many IP-over-satellite implementations use paired proxy servers at both endpoints so that certain communications between clients and servers[52] need not to accept the latency inherent in a satellite connection. For similar reasons, there exist special Virtual private network (VPN) implementations designed for use over satellite links because standard VPN software cannot handle the long packet travel times.

Upload speeds are limited by the user's dial-up modem, while download speeds can be very fast compared to dial-up, using the modem only as the control channel for packet acknowledgement.

Latency is still high, although lower than full two-way geostationary satellite Internet, since only half of the data path is via satellite, the other half being via the terrestrial channel.

One-way broadcast, receive only

One-way broadcast satellite Internet systems are used for

broadcast-based data, audio and video distribution. In the U.S., a Federal Communications Commission (FCC) license is required only for the uplink station and no license is required for users. Note that most Internet protocols will not work correctly over one-way access, since they require a return channel. However, Internet content such as web pages
can still be distributed over a one-way system by "pushing" them out to local storage at end user sites, though full interactivity is not possible. This is much like TV or radio content which offers little user interface.

The broadcast mechanism may include compression and error correction to help ensure the one-way broadcast is properly received. The data may also be rebroadcast periodically, so that receivers that did not previously succeed will have additional chances to try downloading again.

The data may also be encrypted so that while anyone can receive the data, only certain destinations are able to actually decode and use the broadcast data. Authorized users only need to have possession of either a short decryption key or an automatic rolling code device that uses its own highly accurate independent timing mechanism to decrypt the data.

System hardware components

Similar to one-way terrestrial return, satellite Internet access may include interfaces to the public switched telephone network for squawk box applications. An Internet connection is not required, but many applications include a File Transfer Protocol (FTP) server to queue data for broadcast.

System software components

Most one-way broadcast applications require custom programming at the remote sites. The software at the remote site must filter, store, present a selection interface to and display the data. The software at the transmitting station must provide access control, priority queuing, sending, and encapsulating of the data.

Services

Emerging commercial services in this area include:

  • Outernet
    – Satellite constellation technology

Efficiency increases

2013 FCC report cites big jump in satellite performance

In its report released in February, 2013, the Federal Communications Commission noted significant advances in satellite Internet performance. The FCC's Measuring Broadband America report also ranked the major ISPs by how close they came to delivering on advertised speeds. In this category, satellite Internet topped the list, with 90% of subscribers seeing speeds at 140% or better than what was advertised.[53]

Reducing satellite latency

Much of the slowdown associated with satellite Internet is that for each request, many roundtrips must be completed before any useful data can be received by the requester.

HTTP pre-fetching and DNS caching among many others. See the Space Communications Protocol Specifications
standard (SCPS), developed by NASA and adopted widely by commercial and military equipment and software providers in the market space.

Satellites launched

In Geostationary orbit

The WINDS satellite was launched on February 23, 2008. The WINDS satellite is used to provide broadband Internet services to Japan and locations across the Asia-Pacific region. The satellite to provides a maximum speed of 155 Mbit/s down and 6 Mbit/s up to residences with a 45 cm aperture antenna and a 1.2 Gbit/s connection to businesses with a 5-meter antenna.[55] It has reached the end of its design life expectancy.

SkyTerra-1 was launched in mid-November 2010, providing North America, while Hylas-1 was launched in November 2010, targeting Europe.[56]

On December 26, 2010, Eutelsat's KA-SAT was launched. It covers the European continent with 80 spot beams—focused signals that cover an area a few hundred kilometers across Europe and the Mediterranean. Spot beams allow for frequencies to be effectively reused in multiple regions without interference. The result is increased capacity. Each of the spot beams has an overall capacity of 900 Mbit/s and the entire satellite will has a capacity of 70 Gbit/s.[56]

JetBlue Airways can use this service since 2015.[57] The service has also been expanded to United Airlines, American Airlines, Scandinavian Airlines, Virgin America and Qantas.[58][59][60]

The

HughesNet. This Ka-band satellite has over 100 Gbit/s of throughput capacity.[61]

In 2015 and 2016, the Australian Government launched two Sky Muster geostationary satellites to provide internet to regional Australians and residents of External Territories, such as Norfolk Island and Christmas Island.[62]

In 2006[63] and 2015,[64] the Argentinian company ARSAT launched the ARSAT-1 and ARSAT-2 satellites, respectively. Providing internet and TV access to remote locations in its country of origin.

In Medium Earth orbit

Since 2013, the

Medium Earth Orbit
at an altitude of 8,063 km) claims an end-to-end round-trip latency of 238 ms for data services.

Low Earth orbit

As of March 2022, around 2300 satellites have been launched for

OneWeb satellite constellation. SpaceX reported 250,000 users of its Starlink system.[65]

In oceanography and in seismology

Satellite communications are used for data transmission,

ocean floor, and for seismological analyses.[67]

See also

  • Back-channel and return channel
  • DishNET (satellite Internet access in the United States)
  • HughesNet
    (formerly DIRECWAY)
  • IP over DVB
  • Lamit Company – Satellite operator providing fixed and mobile communications including internet.
  • NetHope#NetReliefKit
  • SES Broadband (satellite Internet access in Europe)
  • StarBand
  • Teledesic – satellite company
  • Tooway – Satellite broadband Internet provider
  • TS 2 – Internet provider for U.S. Army soldiers in Afghanistan
  • Very small aperture terminal
     – Satellite communication system with small dish antenna
  • Viasat Inc.
    (Excede Internet)
  • Wireless Internet Service Provider

References

  1. ^ "Satellite Internet: 15 Mbps, no matter where you live in the U.S." Ars Technica. 7 January 2013. Retrieved 5 September 2013.
  2. ^ End-to-End Efficiency for Trunking Networks, Newtec IP Trunking, 2013
  3. ^ "Extra-Terrestrial Relays—Can Rocket Stations Give Worldwide Radio Coverage?" (PDF). Arthur C. Clark. October 1945. Archived from the original (PDF) on 2006-07-15. Retrieved 2009-03-04.
  4. ^ "First Internet Ready Satellite Launched". Space Daily. 2003-09-29. Retrieved 2013-08-29.
  5. ^ Fitchard, Kevin (2012-10-01). "With new satellite tech, rural dwellers get access to true broadband". Gigaom. Retrieved 2013-08-29.
  6. ^ O3b MEO SES. Accessed 25 April 2021
  7. ^ "OneWeb weighing 2,000 more satellites - SpaceNews.com". SpaceNews.com. 24 February 2017. Retrieved 15 April 2018.
  8. ^ "Elon Musk's SpaceX raises over $1 billion this year as internet satellite production ramps up". CNBC. May 24, 2019.
  9. ISSN 0099-9660
    . Retrieved 2018-02-09.
  10. ^ Etherington, Darrell. "SpaceX hopes satellite Internet business will pad thin rocket launch margins". TechCrunch. Retrieved 2018-02-09.
  11. ^ Howell, Elizabeth. "Starlink satellites: Everything you need to know about the controversial internet megaconstellation". Space.com.
  12. ^ SES building a 10-terabit O3b "mPOWER" constellation Space News 11 September 2017. Accessed 25 April 2021
  13. ^ SpaceX launches first pair of O3b mPower satellites SpaceNews. 16 December 2022. Accessed 27 December 2022
  14. ^ A.W. (17 October 2017). "More airlines are offering free Wi-Fi for messaging services". The Economist.
  15. ^ "Satellite broadband takes off, attracts users beyond rural areas – Denver Business Journal". Denver Business Journal. Retrieved 2016-01-18.
  16. ^ "OBSERVER: Copernicus gets sibling— IRIS², the new EU Secure Communication Constellation | Copernicus". www.copernicus.eu. Retrieved 2023-11-03.
  17. ^ "G60 Starlink: China plans second megaconstellation to rival SpaceX". 30 September 2023.
  18. ^ "Reliance Jio demonstrates its satellite-based gigabit internet in India". The Indian Express. 27 October 2023. Retrieved 14 March 2024.
  19. ^ "Amazon Steps up Challenge to Elon Musk's Starlink in India? Eyes Licence for Project Kuiper".
  20. ^ a b Large LEO satellite constellations: Will it be different this time? McKinsey & Company, 4 May 2020, Accessed 25 April 2021
  21. ^ "Ka-band Permitted Space Station List". Federal Communications Commission. 2009-01-25. Archived from the original on 2012-04-21. Retrieved 2013-08-29.
  22. ^ http://www.dbsinstall.com/PDF/WildBlue/Wildblue_Satellite_Basics.pdf[bare URL PDF]
  23. ^ a b "How broadband satellite Internet works". VSAT Systems. Retrieved 2013-08-29.
  24. ^ "Elon Musk is about to launch the first of 11,925 proposed SpaceX internet satellites — more than all spacecraft that orbit Earth today". Business Insider. Retrieved 15 April 2018.
  25. ^ Golding, Joshua (August 9, 2011). "Q: What is the difference between terrestrial (land based) Internet and satellite Internet". Network Innovation Associates. Archived from the original on 2013-06-30. Retrieved August 6, 2021.
  26. ^ "Latency- why is it a big deal for Satellite Internet?". VSAT Systems. Archived from the original on 2014-10-21. Retrieved August 6, 2021.
  27. ^ Tom’s Hardware "How much latency is too much for Online Gaming?". Accessed 23 January 2009. Internet Forum Archived 19 July 2011 at the Wayback Machine
  28. ^ Newtec Productions NV "TP210 Sat3Play Broadband Terminal" (Version R2/06.2010). Satellite Internet Modem factsheet Archived 17 November 2010 at the Wayback Machine
  29. ^ "Data Communications Protocol Performance on Geo-stationary Satellite Links (Hans Kruse, Ohio University, 1996)" (PDF). ohiou.edu. Retrieved 28 March 2018.
  30. ^ Roundtrip latency numbers are from RFC 2488, Section 2: Satellite Characteristics
  31. ^ See Comparative Latency of Internet Connections in Satellite Internet Connection for Rural Broadband, page 7 (RuMBA White Paper, Stephen Cobb, 2011)
  32. ^ Stephen Cobb. "RuMBA White Paper: Satellite Internet Connection for Rural Broadband". RuMBA – Rural Mobile & Broadband Alliance. Archived from the original on 2012-07-29. Retrieved 22 March 2019.{{cite web}}: CS1 maint: unfit URL (link)
  33. .
  34. ^ "Boeing to Build Four Additional 702X Satellites for SES's O3b mPOWER Fleet" (Press release). Boeing. 7 August 2020. Retrieved 25 April 2021.
  35. ^ "Starlink is better than its satellite competition but not as fast as landline internet". 5 August 2021. Retrieved 26 March 2022.
  36. ].
  37. ^ LEO and MEO broadband constellations mega source of consternation SpaceNews, 13 March 2018, Accessed 25 April 2021
  38. ^ The Gravity of Space Debris Via Satellite. March 2019, Accessed 25 April 2021
  39. ^ "Satellites: LEO, MEO & GEO". Atlanta RF. October 29, 2013. Archived from the original on 2014-10-03. Retrieved August 6, 2021.
  40. ^ Kcell, SES demo O3b satellite-enabled remote mobile services Comms Update. 26 May 2022. Accessed 30 May 2022
  41. ^ "Kcell and SES Successfully Demonstrate Cellular Network connectivity in Kazakhstan" (Press release). SES. 25 May 2022. Retrieved 30 May 2022.
  42. ^ "DARPA's Vulture Program Enters Phase II" (Press release). September 15, 2010. Archived from the original on 2012-10-17. Retrieved 2021-08-06.
  43. ^ "C Band Ku Band Comparison". Technical. Link Communications Systems. 2004-07-30. Retrieved 2018-02-10.
  44. ^ HughesNet Fair Access Policy FAQ
  45. ^ "WildBlue: High Speed Satellite Internet Provider". Official web site. Archived from the original on August 18, 2009. Retrieved July 17, 2011.
  46. ^ "Exede: High Speed Satellite Internet Provider". Official web site. Retrieved December 11, 2012.
  47. ^ "Universal satellite home connection | UNIC Project". CORDIS | European Commission. EU Publications Office. April 9, 2008. Retrieved June 20, 2020.
  48. ^ "Security - Communications - Geopolitical - Consultancy". Security - Communications - Geopolitical - Consultancy. Retrieved 28 March 2018.
  49. ^ "Inmarsat BGAN". GMPCS. Retrieved 2013-08-29.
  50. ^ [1] Archived April 9, 2008, at the Wayback Machine
  51. ^ ftp://ftp.rfc-editor.org/in-notes/rfc2488.txt
  52. ^ "Measuring Broadband America – February 2013". Federal Communications Commission. 5 February 2013. Retrieved 2013-08-29.
  53. Transmission Control Protocol
    .
  54. ^ "JAXA - Wideband InterNetworking engineering test and Demonstration Satellite "KIZUNA"(WINDS)". jaxa.jp. Retrieved 28 March 2018.
  55. ^ a b Martyn Williams (December 27, 2010). "European broadband-Internet satellite launched". Network World. Archived from the original on March 8, 2012. Retrieved July 17, 2011.
  56. ^ "JetBlue adds free Wi-Fi, says it can handle streaming video". pcworld.com. Retrieved 28 March 2018.
  57. ^ Galbraith, Craig (August 15, 2016). "ViaSat's Exede Business Talks Up Sky-High Broadband Contracts". Channel Partners. Retrieved October 3, 2016.
  58. ^ de Selding, Peter B. (Feb 12, 2014). "ViaSat Gears Up for Loral Trial, Reports Slower Exede Growth". SpaceNews. Archived from the original on May 4, 2014. Retrieved 4 May 2014.
  59. ^ Freeman, Mike (September 9, 2016). "ViaSat Lands Another Airline For Inflight Wi-Fi". The San Diego Union-Tribune. Retrieved September 1, 2017.
  60. ^ "Home". 17 January 2011. Archived from the original on 17 January 2011. Retrieved 28 March 2018.
  61. ^ "SSL Delivers High Performance Broadband Satellite To Launch Base, Demonstrates Leadership in Satellites For Fast Internet With Satellite For Australia's Broadband Network". sslmda.com.
  62. ^ "El Arsat-1, Argentina". argentina.gob.ar.
  63. ^ "Lanzaron el satélite argentino Arsat-2". infobae.com.
  64. ^ "Starlink reaches 250,000 subscribers as it targets aviation and other markets". 21 March 2022. Retrieved 22 March 2022.
  65. OCLC 703246903. Retrieved July 15, 2021. {{cite book}}: |journal= ignored (help
    )
  66. OCLC 1101953759. Archived (PDF) from the original on March 6, 2020. Retrieved July 15, 2021. {{cite book}}: |journal= ignored (help
    )

External links