science

JSAT (satellite constellation)

JSAT (satellite constellation) 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 JSAT (satellite constellation) rather than just read about it. In short: The JSAT constellation is a communication and broadcasting satellite constellation formerly operated by JSAT Corporation and currently by SKY Perfect JSAT Group. It has become the most important commercial constellation in Japan, and fifth in the world.

Key takeaways

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

Reference excerpt

The JSAT constellation is a communication and broadcasting satellite constellation formerly operated by JSAT Corporation and currently by SKY Perfect JSAT Group. It has become the most important commercial constellation in Japan, and fifth in the world. It has practically amalgamated all private satellite operators in Japan, with only B-SAT left as a local competitor. JSAT began in 1985, with the opening by the Government of Japan, of the communication markets in Japan and the founding of Japan Communications Satellite Company, Satellite Japan Corporation, Space Communications Corporation. It grew by own investment, mergers and acquisitions of the parent companies. As of August 2016, it includes the fleets of three previously mentioned companies, Horizons Satellite and NTT DoCoMo and the DSN military network.

Constellations SKY Perfect JSAT Group has gone through some significant mergers and acquisition and the JSAT constellation has grown accordingly. It has practically amalgamated all private satellite operators in Japan, with only B-SAT left as a competitor. Since these mergers were the result of the opening of the communication markets in Japan, that growth does not mean that it has monopolised the segment, but rather is the go-to company for space segment operation. During its history, the JSAT network has absorbed a series of fleets and constellations. Some are core constellations, some are operation for third parties and some are joint ventures. As of August 2016, the current configuration of the JSAT fleet is this:

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with JSAT (satellite constellation)

Start with the simplest possible case. Write down what JSAT (satellite constellation) 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 JSAT (satellite constellation) 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 JSAT (satellite constellation) 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 JSAT (satellite constellation)

In research: JSAT (satellite constellation) 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 JSAT (satellite constellation) 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: JSAT (satellite constellation) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Communications satellite constellations, Communications satellite operators, Communications satellites of Japan, so understanding it makes those chapters shorter.
In everyday life: Look for JSAT (satellite constellation) 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “JSAT (satellite constellation)” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study JSAT (satellite constellation) in 20 minutes

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

Frequently asked questions

What is JSAT (satellite constellation) in simple terms?

Why does JSAT (satellite constellation) 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 JSAT (satellite constellation)?

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 JSAT (satellite constellation).