astronomy

Universal Satellites Automatic Location System

Universal Satellites Automatic Location System is a astronomy 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 Universal Satellites Automatic Location System rather than just read about it. In short: Universal Satellites Automatic Location System (USALS), also known (unofficially) as DiSEqC 1.3, Go X or Go to XX is a satellite dish motor protocol that automatically creates a list of available satellite positions in a motorised satellite dish setup. It is used in conjunction with the DiSEqC 1.2 protocol.

Key takeaways

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

Reference excerpt

Universal Satellites Automatic Location System (USALS), also known (unofficially) as DiSEqC 1.3, Go X or Go to XX is a satellite dish motor protocol that automatically creates a list of available satellite positions in a motorised satellite dish setup. It is used in conjunction with the DiSEqC 1.2 protocol. It was developed by STAB, an Italian motor manufacturer, who still make the majority of USALS compatible motors. Software on the satellite receiver (or external positioner) calculates the position of all available satellites from an initial location (input by the user), which is the latitude and longitude relative to Earth. Calculated positions can differ ±0.1 degrees from the offset. This is adjusted automatically and does not require previous technical knowledge. Compared to DiSEqC 1.2, it is not necessary to manually search and store every known satellite position. Pointing to a known satellite position (for example 19.2ºE) is enough; this position will act as the central point, and the USALS system will then calculate visible satellites position within the offset. Receivers are aligned to the satellite most southern to their position in the northern hemisphere, or the northernmost in the southern hemisphere. As it is not an open standard, for a receiver to carry the USALS logo it must undergo a certification test by STAB's laboratories. If successful the manufacturer can include a USALS settings entry in its own menu, as well as place the logo on the front of their unit. However, a large number of manufacturers of both receivers and motors provide compatible modes which have not received certification, leading to use of unofficial terms. USALS is a program and not a communication protocol. The USALS calculates the dish angular position given by the dish longitude/latitude and the position of the satellite in geostationary orbit. It then sends the angular position to the positioner using the DiSEqC 1.2 protocol. This calculation is straight on using geometric calculations.

See also Antenna tracking system Automatic Tracking Satellite Dish Satellite finder DiSEqC = Digital Satellite Equipment Control Duo LNB Monoblock LNB SAT>IP ip based approach

References

External links STAB Italy official website Archived 2021-03-14 at the Wayback Machine What is DiSEqC? Archived 2018-03-12 at the Wayback Machine

Worked examples

Example 1 — a first encounter with Universal Satellites Automatic Location System

Start with the simplest possible case. Write down what Universal Satellites Automatic Location System claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Universal Satellites Automatic Location System 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 Universal Satellites Automatic Location System 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 Universal Satellites Automatic Location System

In research: Universal Satellites Automatic Location System appears in astronomy 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 Universal Satellites Automatic Location System 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: Universal Satellites Automatic Location System is common in secondary-school and first-year university syllabi. It links to neighbouring topics Satellite broadcasting, Television technology, so understanding it makes those chapters shorter.
In everyday life: Look for Universal Satellites Automatic Location System 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 Universal Satellites Automatic Location System in 20 minutes

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

Frequently asked questions

What is Universal Satellites Automatic Location System in simple terms?

Why does Universal Satellites Automatic Location System matter?

Because it connects several astronomy 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 Universal Satellites Automatic Location System?

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 Universal Satellites Automatic Location System.