engineering

Repair Satellite Prototype

Repair Satellite Prototype is a engineering 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 Repair Satellite Prototype rather than just read about it. In short: RSat-P (Repair Satellite-Prototype) is a microsatellite built by the United States Naval Academy (USNA) in Annapolis, Maryland. The small spacecraft is a 3U CubeSat intended to demonstrate capabilities for minor in-orbit repair of a much larger, conventional spacecraft.

Key takeaways

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

Reference excerpt

RSat-P (Repair Satellite-Prototype) is a microsatellite built by the United States Naval Academy (USNA) in Annapolis, Maryland. The small spacecraft is a 3U CubeSat intended to demonstrate capabilities for minor in-orbit repair of a much larger, conventional spacecraft. RSat-P was launched on 16 December 2018 on an Electron rocket as part of NASA's Educational Launch of Nanosatellites (ELaNa) Mission 19. While the satellite has never been identified, all the objects classified from its launch have decayed, with RSat-P being one of the unidentified ones among those.

Overview It has been determined that about 1/3 of all commercial spacecraft failures originate on their solar panel deployment, wiring, sunshield, or antenna deployment, so RSat-P was designed to test the potential of a CubeSat to fix such small-scale large-impact failures. Potential deployments include an RSat embedded in its host spacecraft, where it uses its claws to crawl along the failed spacecraft to diagnose and repair. Alternatively, an RSat could be released from a nearby constellation spacecraft in combination with a propulsive BRICSat unit to reach the failed spacecraft. While the RSat may be limited to diagnostics and minor repairs, more complex servicing would be performed by a large spacecraft called Robotic Servicing of Geosynchronous Satellites (RSGS), that is being developed by the Defense Advanced Research Projects Agency (DARPA). The team includes Edward Hanlon, Benjamin Keegan and Morgan Lange, Jacob Pittman, Gavin Roser and Dakota Wenberg; the adviser is Jin Kang. In 2017, the team was awarded the Secretary of the Navy's Innovation Scholar Award, at a ceremony at The Pentagon, for their research project. The first robotic arm prototype was scheduled for a launch in early 2017, but was postponed for December 2018.

Description RSat-P is a small 3U CubeSat that is part of the Autonomous On-orbit Diagnostic System (AMODS) being developed by the U.S. Naval Academy satellite laboratory to demonstrate diagnostic and repair capabilities by validating some key robotic functions while in orbit. AMODS consists of two main components: RSat and BRICSat, which acts as the propulsive unit for RSat, but for the prototype RSat-P mission, the satellite will not have propulsion. The two robotic arms will be moved through some test patterns to simulate the repair of a damaged spacecraft. The combined mission of an RSat with BRICSat is called "The Modified BRICSat-RSat Space Experiment" (MBSE), which will be launched some time after the validation of the robotic arms on RSat-P. The electric thrusters on BRICSat are called "Micro-Cathode Arc Thruster" (μCAT), developed by the George Washington University.

Robotic arms RSat-P represents the first time robotic arms have been installed on such a small platform. The robotic arms are made of 3D printed carbon fiber, they have 7 degrees-of-freedom each, are 60 cm (24 in) long, and have a total arm-span of 1.5 m (4 ft 11 in). RSat-P has a CMOS camera attached at the center of the body to monitor the accuracy of the arm movements, and there are two more cameras fitted to the claws, enabling the satellite to provide on-demand diagnostic pictures of itself.

Activities As of 2016, the main tasks to demonstrate in this mission include:

Navigate and coordinate: to demonstrate that each of the arms is capable of navigating to a precise location for flexible orbital operations. Handshake: to demonstrate that RSat-P is capable of operating the arms in proximity to each other. Manipulation: to simulates the use of the manipulators to interact with another spacecraft. (A) Arm 1 will pick up a demonstration object from one of the ends of the spacecraft, and move it to within camera range. (B) Arm 2 will then take control of the object. This validates the manipulator design, and demonstrates the precision of the arm. Imaging: RSat's arms will move to a variety of positions around the spacecraft and image all six faces.

Illustrations

Worked examples

Example 1 — a first encounter with Repair Satellite Prototype

Start with the simplest possible case. Write down what Repair Satellite Prototype claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Repair Satellite Prototype 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 Repair Satellite Prototype 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 Repair Satellite Prototype

In research: Repair Satellite Prototype appears in engineering 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 Repair Satellite Prototype 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: Repair Satellite Prototype is common in secondary-school and first-year university syllabi. It links to neighbouring topics CubeSats, Military space program of the United States, Robotic manipulators, so understanding it makes those chapters shorter.
In everyday life: Look for Repair Satellite Prototype 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 Repair Satellite Prototype in 20 minutes

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

Frequently asked questions

What is Repair Satellite Prototype in simple terms?

Why does Repair Satellite Prototype matter?

Because it connects several engineering 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 Repair Satellite Prototype?

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 Repair Satellite Prototype.