science

SOCRATES (satellite)

SOCRATES (satellite) 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 SOCRATES (satellite) rather than just read about it. In short: SOCRATES or Space Optical Communications Research Advanced Technology Satellite is a Japanese small satellite launched in 2014. The satellite is purely a technology demonstrator designed by NICT intended to help AES company to gain experience in basic mission control, attitude control and spacecraft communications.

Key takeaways

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

Reference excerpt

SOCRATES or Space Optical Communications Research Advanced Technology Satellite is a Japanese small satellite launched in 2014. The satellite is purely a technology demonstrator designed by NICT intended to help AES company to gain experience in basic mission control, attitude control and spacecraft communications. Its main experiment is SOTA (Small Optical TrAnsponder), an optical small satellite communications demonstrator. All subsystems of spacecraft are powered by solar cells mounted on spacecraft body and stub wings, with estimated electrical power of 120W BOL degrading to 100W EOL.

History SOTA was the first lasercom on board a microsatellite, performing a variety of experiments in a compact package of a less than 6 kg. The main one is the 10 Mbit/s links at 1549 nm using coarse and fine-pointing to accurately transmit the 35-mW laser through a 5-cm Cassegrain telescope. Additional capabilities included a B92-like QKD protocol at 800-nm band for the first-time quantum-limited demonstration from space.

Launch SOCRATES was launched from Tanegashima, Japan, on 24 May 2014 at 03:05:00 UTC by an H-IIA 202.

Worked examples

Example 1 — a first encounter with SOCRATES (satellite)

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

In research: SOCRATES (satellite) 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 SOCRATES (satellite) 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: SOCRATES (satellite) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Asian spacecraft stubs, Communications satellites of Japan, Secondary payloads, so understanding it makes those chapters shorter.
In everyday life: Look for SOCRATES (satellite) 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 SOCRATES (satellite) in 20 minutes

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

Frequently asked questions

What is SOCRATES (satellite) in simple terms?

Why does SOCRATES (satellite) 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 SOCRATES (satellite)?

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 SOCRATES (satellite).