science

Ground station

Ground station is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ground station rather than just read about it. In short: A ground station, Earth station, or Earth terminal is a terrestrial radio station designed for extraplanetary telecommunication with spacecraft (constituting part of the ground segment of the spacecraft system), or reception of radio waves from astronomical radio sources. Ground stations may be located either on the surface of the Earth, or in its atmosphere.

Key takeaways

Ground station belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ground station to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ground station from memory before moving on to harder problems.

Reference excerpt

A ground station, Earth station, or Earth terminal is a terrestrial radio station designed for extraplanetary telecommunication with spacecraft (constituting part of the ground segment of the spacecraft system), or reception of radio waves from astronomical radio sources. Ground stations may be located either on the surface of the Earth, or in its atmosphere. Earth stations communicate with spacecraft by transmitting and receiving radio waves in the super high frequency (SHF) or extremely high frequency (EHF) bands (e.g. microwaves), or in the optical bands for laser communication (then called Optical Ground Station, OGS). When a ground station successfully transmits radio waves to a spacecraft (or vice versa), it establishes a telecommunications link. A principal telecommunications device of the ground station is the parabolic antenna. Ground stations may have either a fixed or itinerant position. Article 1 § III of the International Telecommunication Union (ITU) Radio Regulations describes various types of stationary and mobile ground stations, and their interrelationships. Specialized satellite Earth stations or satellite tracking stations are used to telecommunicate with satellites — chiefly communications satellites. Other ground stations communicate with crewed space stations or uncrewed space probes. A ground station that primarily receives telemetry data, or that follows space missions, or satellites not in geostationary orbit, is called a ground tracking station, or space tracking station, or simply a tracking station. When a spacecraft or satellite is within a ground station's line of sight, the station is said to have a view of the spacecraft (see pass). A spacecraft can communicate with more than one ground station at a time. A pair of ground stations are said to have a spacecraft in mutual view when the stations share simultaneous, unobstructed, line-of-sight contact with the spacecraft.

Telecommunications port A telecommunications port — or, more commonly, teleport — is a satellite ground station that functions as a hub connecting a satellite or geocentric orbital network with a terrestrial telecommunications network, such as the Internet. Teleports may provide various broadcasting services among other telecommunications functions, such as uploading computer programs or issuing commands over an uplink to a satellite. In May 1984, the Dallas/Fort Worth Teleport became the first American teleport to commence operation.

Earth terminal complexes

In Federal Standard 1037C, the United States General Services Administration defined an Earth terminal complex as the assemblage of equipment and facilities necessary to integrate an Earth terminal (ground station) into a telecommunications network. FS-1037C has since been subsumed by the ATIS Telecom Glossary, which is maintained by the Alliance for Telecommunications Industry Solutions (ATIS), an international, business-oriented, non-governmental organization. The Telecommunications Industry Association also acknowledges this definition.

Satellite communications standards The ITU Radiocommunication Sector (ITU-R), a division of the International Telecommunication Union, codifies international standards agreed-upon through multinational discourse. From 1927 to 1932, the International Consultative Committee for Radio administered standards and regulations now governed by the ITU-R. In addition to the body of standards defined by the ITU-R, each major satellite operator provides technical requirements and standards that ground stations must meet in order to communicate with the operator's satellites. For example, Intelsat publishes the Intelsat Earth Station Standards (IESS) which, among other things, classifies ground stations by the capabilities of their parabolic antennas, and pre-approves certain antenna models. Eutelsat publishes similar standards and requirements, such as the Eutelsat Earth Station Standards (EESS). The Interagency Operations Advisory Group offers a Service Catalog describing standard services, Spacecraft Emergency Cross Support Standard, and Consultative Committee for Space Data Systems data standards. The Teleport (originally called a Telecommunications Satellite Park) innovation was conceived and developed by Joseph Milano in 1976 as part of a National Research Council study entitled, Telecommunications for Metropolitan Areas: Near-Term Needs and Opportunities.

Networks A network of ground stations is a group of stations located to support spacecraft communication, tracking, or both. A network is established to provide dedicated support to a specific mission, function, program or organization. Ground station networks include:

United States Space Force Satellite Control Network (SCN) NASA Near Space Network NASA Deep Space Network Russia tracking network European Space Tracking (ESTRACK) network ISRO Telemetry, Tracking and Command Network (ISTRAC) JAXA Near-Earth Tracking and Control Network China Satellite Launch and Tracking Control (CLTC) Norway Kongsberg Satellite Services (KSAT) Swedish Space Corporation (SSC) CONNECT ground station network RBC Signals Global Ground Station Network Leaf Space ground station network Amazon Web Services Ground Station network SatNOGS Network Other historical networks have included:

Smithsonian Astrophysical Observatory (SAO) Optical Tracking Network US Minitrack Applied Physics Laboratory Transit Network (Tranet) Interkosmos network

Major Earth stations and Earth terminal complexes

Illustrations

Worked examples

Example 1 — a first encounter with Ground station

Start with the simplest possible case. Write down what Ground station claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ground station before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ground station ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ground station

In research: Ground station appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Ground station in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Ground station is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ground stations, Satellite communications, Spaceflight ground equipment, so understanding it makes those chapters shorter.
In everyday life: Look for Ground station outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Ground station in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ground station means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Ground station out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ground station in simple terms?

Why does Ground station matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ground station?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ground station.