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Category: satellites – Page 177

The inventor of the EmDrive, a controversial space propulsion device that may speed up space travel, has revealed details of how it could be used to create a reusable launch vehicle to take rockets and satellites into space, as well as for personal flight.

Roger Shawyer has published a presentation about the third generation of the EmDrive, which he says is an improvement on the second generation. The original concept for the EmDrive, developed in 2008, was designed to enable in-orbit propulsion. The second generation, which has been in development since 2010, uses a superconducting cavity.

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LONDON (Reuters) — The risk of cyber attacks targeting ships’ satellite navigation is pushing nations to delve back through history and develop back-up systems with roots in World War Two radio technology.

Ships use GPS (Global Positioning System) and other similar devices that rely on sending and receiving satellite signals, which many experts say are vulnerable to jamming by hackers.

About 90 percent of world trade is transported by sea and the stakes are high in increasingly crowded shipping lanes. Unlike aircraft, ships lack a back-up navigation system and if their GPS ceases to function, they risk running aground or colliding with other vessels.

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A startup called OneWeb aims to make access to the internet (which the U.N. has deemed a basic human right) more widely available to those living in rural areas.

A satellite internet startup called OneWeb wants to make internet access available to all. From rural neighborhoods to completely remote communities, the company want to make sure that the internet isn’t just a luxury afforded to those who live in certain locations. Thanks in part to backing from Richard Branson of the Virgin Group, as well as Airbus and Qualcomm, OneWeb hopes to launch 720 satellites that would provide internet to places on Earth that are normally far out of reach.

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Thales Alenia Space has seen massive savings in time and cost for the manufacturing of its products thanks to 3D printing, said Florent Lebrun, who heads space antenna development at the company. With this new manufacturing process, not only can Thales cut production lead time for certain components from months to weeks, it can save up to 50 percent on expenditure per part, he said.

Thales began experimenting with 3D printing, or additive manufacturing, in 2013, when it produced its first few demonstrator products. In 2015, it implemented a 3D-printed part for the first time on a telecommunications satellite — an antenna horn mounting strut for TurkmenAlem52E/MonacoSat. The company also produced eight titanium antenna fittings for Arabsat 6B that year, Lebrun said.

Now, two years later, after the launch of SGDC 1, Telkom 3S and Koreasat 7, Thales has orbited around 80 3D-printed parts, with more than 120 additional parts produced this year for future applications.

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Derelict satellites could in future be grappled and removed from key orbits around Earth with a space tug using magnetic forces.

This same magnetic attraction or repulsion is also being considered as a safe method for multiple satellites to maintain close formations in space.

Such satellite swarms are being considered for future astronomy or Earth-observing missions – if their relative positions can stay stable they could act as a single giant telescope.

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A 3D printer that could re-create itself from lunar material is in development at a university in Canada.

The technology could one day enable humans to 3D-print lunar bases, as well as conduct in-space manufacturing of satellites and solar shields on the moon that could help fight global warming, according to Alex Ellery, an associate professor in the Department of Mechanical and Aerospace Engineering at Carleton University in Ottawa, who is leading the project.

“I believe that self-replicating machines will be transformative for space exploration because it effectively bypasses launch costs,” Ellery told Space.com. [How Moon Bases and Lunar Colonies Work (Infographic)].

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Nuclear fusion is the process that powers the sun, but closer to home scientists are trying to develop fusion reactors that could provide immense amounts of energy. These reactors are big and (currently) inefficient, but a NASA-funded startup called Princeton Satellite Systems is working on a small-scale fusion reactor that could power advanced fusion rockets. Suddenly, other planets and even other star systems could be in reach.

All the forms of rocket propulsion we currently have involve accelerating propellant out of a nozzle. Then, physics takes over and the vessel moves in the opposite direction. Most spacecraft use chemical propulsion, which provides a large amount of thrust over a relatively short period of time. Some missions have been equipped with ion drives, which use electrical currents to accelerate propellant. These engines are very efficient, but they have low thrust and require a lot of power. A fusion rocket might offer the best mix of capabilities.

Current nuclear reactors use fission to generate energy; large atomic nuclei are broken apart and some of that mass is transformed into energy. Fusion is the opposite. Small atomic nuclei are fused together, causing some mass to be converted into energy. This is what powers stars, but we’ve had trouble producing the necessary temperatures and pressure on Earth to get net positive energy generation.

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