science

KAUR (satellite bus)

KAUR (satellite bus) 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 KAUR (satellite bus) rather than just read about it. In short: The KAUR (Russian: КАУР, Космический Аппарат Унифицированного Ряда, Universal Spacecraft Series) program was a series of satellite buses designed and manufactured by ISS Reshetnev (then NPO PM). Its design is based on a pressurized bus originally developed in the 1960s and has been used from low Earth Orbit to medium Earth orbit and even to GEO.

Key takeaways

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

Reference excerpt

The KAUR (Russian: КАУР, Космический Аппарат Унифицированного Ряда, Universal Spacecraft Series) program was a series of satellite buses designed and manufactured by ISS Reshetnev (then NPO PM). Its design is based on a pressurized bus originally developed in the 1960s and has been used from low Earth Orbit to medium Earth orbit and even to GEO. It has four different generations and its different versions have been used from civilian communications to satellite navigation.

Generations In total, 4 satellite platform generations were developed: KAUR-1, -2, -3 and -4. From 1965 to 2009, more than 400 communications satellites, both military and civilian, were built on the basis of these platforms and their upgraded versions.

KAUR-1 The KAUR-1 was a pressurised cylinder with a diameter of 2 m, length of 3 m and weighed 800 kg. It had no propulsion system, and instead used a passive single-axis magneto-gravity stabilisation system. The KAUR-1 bus became the basis for a series of navigation and related satellites built by OKB-10, later renamed NPO-PM and now ISS Reshetnev. The first generation of the bus was used on:

Tsyklon Sfera Parus Tsikada

KAUR-2 The KAUR-2 was designed by OKB-1 (and later Reshetnev Company) for the Molniya satellites. It was originally an experimental bus, but after successful missions, was put into production. The bus had a sealed 2.5 cubic meter internal volume to stabilize the temperature. Its attitude control system could point with a 10° accuracy, and transmitted in the 10 m bands. Its propulsion system was derived from the Venera 1VA probes. It used the KDU-414 propulsion system and S5.31 engine from 1960 to 1974, after which it upgraded to the KDU-414A with the S5.114 engine. This had a specific impulse of 290 seconds.

Molniya-1+ Molniya-1T Molniya-2 Molniya-3 Molniya-3K

KAUR-3 This was developed in the 1960s for the first Russian geosynchronous communications satellites, for repeaters and TV broadcasts. It has a three-axis attitude control system with an accuracy of 0.25°, and independently tracking solar panels.· As part of the development, in July 1974 a Proton DM rocket put a Molniya-1 into geosynchronous orbit as a test communications methods.

Raduga Ekran Ekran-M Gorizont Globus

KAUR-4 The KAUR-4 was designed for Russian geosynchronous satellites in the 1980s. It reached flight status in the 1990s.

Potok Tselina Luch Gals (Ekspress) Ekspress-A Ekspress-AM SESAT-1

Ekspress

While not presented as such, the Ekspress satellite bus can be considered at least its replacement. It is an unpressurized bus originally designed for GEO, but that has been adapted for medium Earth orbit and to highly elliptical orbit.

See also ISS Reshetnev – Designer and manufacturer of the platform. Ekspress (satellite bus) – The platform that replaced KAUR for the most demanding applications.

References

External links ISS Reshetnev

Illustrations

Worked examples

Example 1 — a first encounter with KAUR (satellite bus)

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

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

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

Frequently asked questions

What is KAUR (satellite bus) in simple terms?

Why does KAUR (satellite bus) 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 KAUR (satellite bus)?

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 KAUR (satellite bus).