science

Sevsat

Sevsat 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 Sevsat rather than just read about it. In short: SEVSAT is an acronym for Ship Equip VSAT, a maritime satellite broadband system from the Ship Equip Group with its head office in Norway. Ship Equip is a subsidiary of Inmarsat, a mobile satellite services operator.

Key takeaways

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

Reference excerpt

SEVSAT is an acronym for Ship Equip VSAT, a maritime satellite broadband system from the Ship Equip Group with its head office in Norway. Ship Equip is a subsidiary of Inmarsat, a mobile satellite services operator.

History SEVSAT was developed from 2000–2003, and was initially based on space segment allocations from Eutelsat and Stratos who had implemented the iDirect technology on some of their satellites. In 2004, Stratos closed down their maritime broadband division, and Ship Equip turned to the start-up space segment broker New Wave Broadband and satellite operator Intelsat. These two companies had independently decided to implement iDirect technology on the 907 satellite that covered central and northern Europe, where customers of Ship Equip were primarily located. From 2004–2006, while focusing primarily on its local markets in the offshore oil, gas and fisheries segments, the number of SEVSAT customers increased rapidly to over 100 installed systems early in 2006, and 200 systems by mid-2007. The rate of growth during this period caught the attention of the media and in April 2006, the leading financial newspaper in Norway, Dagens Næringsliv, ran an article indicating that Ship Equip was challenging Telenor, which at that time was the market leader in maritime VSAT. (Shortly after, Telenor Satellite Services was purchased and merged with France Telecom Mobile Satellite Communications (FTMSC) under the Vizada brand). The article initiated further press coverage from regional newspaper Sunnmørsposten and national newspaper Finansavisen. In 2009, the Comsys group's annual VSAT report quoted Ship Equip as having a 14.3% share in the maritime VSAT market. In 2011, Ship Equip was purchased by London-based Inmarsat for $159.5 million. According to Inmarsat, at the time of purchase, approximately 10% of vessels using Ku-band VSAT worldwide were using networks provided by Ship Equip.

Technology SEVSAT includes above deck equipment (ADE) and below deck equipment (BDE). The ADE consists of the antenna which, except for some early deliveries, are SeaTel antennas. Two types of SEVSAT systems exist, C-band and Ku-band, denoting the frequency range in which they are capable of receiving a satellite signal. The C-band antennas are generally large, from 2.4–3.6 m (7.9–11.8 ft) in dish diameter. The Ku-band antennas are smaller, from 1–1.5 m (3.3–4.9 ft) in dish diameter. The BDE most commonly consists of one electronic rack containing the following components: an iDirect modem, the SEVSAT global satellite switching unit, a DAC, Cisco Routers, telephone adapters and a UPS.

References

Worked examples

Example 1 — a first encounter with Sevsat

Start with the simplest possible case. Write down what Sevsat 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 Sevsat 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 Sevsat 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 Sevsat

In research: Sevsat 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 Sevsat 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: Sevsat is common in secondary-school and first-year university syllabi. It links to neighbouring topics Satellite Internet access, Telecommunications equipment, so understanding it makes those chapters shorter.
In everyday life: Look for Sevsat 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 Sevsat in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sevsat 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 Sevsat out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sevsat in simple terms?

Why does Sevsat 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 Sevsat?

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 Sevsat.