Connect with us

Gadgets

Swarms of tiny satellites could act like one giant space telescope – TechCrunch

Published

on

It won’t be long before the James Webb Space Telescope is launched, an enormous and complex feat of engineering — but all one piece. That’s a good thing for now, but new research suggests that in the near future giant telescopes like the Webb might be replaced (or at least augmented) by swarms of tiny spacecraft working in concert.

One advance, from Ben-Gurion University in Israel, is a leap in the capabilities of what are called synthetic aperture systems. It’s a technique where a single small camera moves across a space, capturing images as it goes, and by very careful analysis of the data it collects, it can produce imagery like that created by a much larger camera — essentially synthesizing a bigger aperture.

As documented in a paper published today in Optica, the team leapfrogs existing methods in an interesting way. Two satellites move in synchrony around the edge of a circle, collecting data as they go and beaming it to a third stationary one; this circle describes the synthetic aperture the two cameras are creating.

“We found that you only need a small part of a telescope lens to obtain quality images,” explained BGU grad student Angika Bulbul, who led the research, in a news release. “Even by using the perimeter aperture of a lens, as low as 0.43 percent, we managed to obtain similar image resolution compared to the full aperture area of mirror/lens-based imaging systems.”

In other words, they were basically able to get the results of a camera 50 times the size. That would be impressive anywhere, but up in space it’s especially important. Putting something as huge and complex as the Webb into orbit is an incredibly complicated and drawn out endeavor. And it’s putting a lot of eggs in one (very carefully checked and rechecked) basket.

But if you could instead use a handful of satellites working together, and just replace one if it fails, that really opens up the field. “We can slash the huge cost, time and material needed for gigantic traditional optical space telescopes with large curved mirrors,” Bulbul said.

One of the challenges of space telescopes, however, is that they need to take measurements with extreme precision. And keeping a satellite perfectly still is hard enough, to say nothing of having it move perfectly to within fractions of a millimeter.

To keep on track, right now many satellites use reliable fixed sources of light, like bright stars, as reference points when calculating various things relating to their operations. Some astronomers have even used lasers to excite a point high in the atmosphere to provide a sort of artificial star for these systems to use.

These methods both have their strengths and weaknesses, but MIT researchers think they’ve found a more permanent, high-precision solution: a “guide star” satellite that would sit thousands of miles out and train a strong laser on the Earth and its orbital region.

This light source would be reliable, steady and highly visible; satellites could use it to calculate their position and the minute changes to their imaging apparatus caused by heat and radiation, perhaps to a degree not possible with actual stars or atmospheric dots.

Both these intriguing technologies are still very much in the lab, but theory is where all big advances start, and it could be that in a few years, swarms of satellites will be sent into space not to provide terrestrial communications, but to create a massive synthetic telescope looking out on the universe.

Source link

Continue Reading
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Gadgets

Like pixels to my ears: Asus headset uses mini LEDs to animate earcups

Published

on

Asus

Because a gaming headset sits on your head (where you can’t see it), its looks aren’t all that important. But that hasn’t stopped headset makers from blinging out their products. Besides, if you’re on camera livestreaming or talking to your teammates, you might be looking to spice things up with pink cat ears or RGB-infused earcups. The Asus ROG Delta S Animate offers a new, pixel-powered twist to gamers who want to put on a show.

Asus has put its AniMe Matrix custom lighting design system on both of the Delta S Animate’s earcups. Mini LEDs fill the space and light up to depict preset or customized effects selected via Asus’ free Armoury Crate software. An Asus spokesperson told Ars Technica that the ROG Delta S Animate has over 100 mini LEDs per earcup. Until this week, the AniMe Matrix was only available on select Asus Zephyrus gaming laptops. Asus’ decision to continue offering the feature in new PCs—and now in a new category—shows the company is seeing some interest in the concept.

Want ghosts flying across the earcup pixel by pixel before turning into a pumpkin? Why not?

From the patch to your headset.

From the patch to your headset.

Asus

Feeling flirty? A dot matrix heart will convey your feelings to anyone in sight of your side profile.

How romantic.

How romantic.

Asus

You can also program the mini LEDs to react to your voice, with the effect becoming more intense the louder you speak.

The mini LEDs can react to how loud you're speaking.
Enlarge / The mini LEDs can react to how loud you’re speaking.

Asus

This Soundwave feature is one I’ve tried on the Asus ROG Delta S headset, which has RGB LEDs around the earcups’ perimeters. It worked seemlessly there, even if the colors looked a bit faded on my webcam. Hopefully, the tiny LEDs in the Asus’ new headset are bright enough to be visible in various lighting environments (Asus didn’t share a brightness spec).

You can even make your own animation by uploading an image to the software (Asus recommends a white one) and then playing with specifics, like brightness, contrast, and delay times. You can also program the mini LEDs to scroll through words.

Get your message across.
Enlarge / Get your message across.

Asus

A dedicated knob on one of the earcups lets you turn the animations on and off, and you can also control volume and toggle the microphone with on-ear controls.

Asus ROG Zephyrus G14.
Enlarge / Asus ROG Zephyrus G14.

The headset weighs 0.68 lbs, and the D-shaped earcups are lined with your choice: leather or a combination of leather and mesh fabric.

Asus seems to have paid attention to audio quality as well, carrying over the specs of its impressive Delta S headphones. The new headset’s 50 mm neodymium drivers are standard among modern gaming headsets, but the cans’ frequency response is higher than the typical 20 – 20,000 Hz, peaking at 40,000 Hz. An impedance of 32 ohms is also a smidgen higher than the 30 ohms we often see in gaming headsets.

The upcoming peripheral embraces USB-C for future-proofing and USB-A for versatility. It also supports Hi-Res music with a Hi-Fi ESS 9821 Quad-DAC and integrated Master Quality Authenticated (MQA) renderer.

If you want to add some flair to your cranium, this headset could be a unique way to do it. Asus said the ROG Delta S Animate will be available in mid-to-late December for $250.

Ars Technica may earn compensation for sales from links on this post through affiliate programs.

Continue Reading

Gadgets

Australia also wants Google to unbundle search from Android

Published

on

Enlarge / Let’s see, you landed on my “Google Ads” space, and with three houses… that will be $1,400.

Ron Amadeo / Hasbro

The Australian Competition and Consumer Commission (ACCC) is the latest government regulatory body to take issue with how Google does business. As Reuters reports, the ACCC wants Google to show a “choice screen” to Android users, allowing them to pick a default search engine other than Google Search. It also wants to limit Google’s ability to pay Apple and other vendors to be the default search engine on other platforms.

ACCC Chair Rod Sims explained the commission’s reasoning in a statement:

We are concerned that Google’s dominance and its ability to use its financial resources to fund arrangements to be the default search engine on many devices and other means through which consumers access search, such as browsers, is harming competition and consumers. Google pays billions of dollars each year for these placements, which illustrates how being the default search engine is extremely valuable to Google’s business model.

Market research firm Kantar says Android has a 60 percent share of the smartphone market, while on iOS and macOS, Google pays Apple an estimated $15 billion per year to be the default search on Safari. Google also pays Mozilla $400 million per year to remain the default on Firefox. Google has a 94 percent share of the Australian search engine market.

Google’s closest search competitor is Microsoft’s Bing, which has something like 2.5 percent market share worldwide. That’s despite being the default search engine on Windows, the world’s second most popular operating system. Google recently told an EU court that “Google” is the #1 search query on Bing, claiming that stat as evidence that users are choosing Google rather than being forced into using it.

Google has already gone through a similar Android unbundling change in the EU, which saw the company add ballot screens for the default search engine and default browser. The EU also shut down some provisions of Google’s standard “Mobile Application Distribution Agreement” (MADA) that OEMs needed to sign in order to license the Google apps. One change means that Google can’t force an “all-or-nothing” bundling of Google’s apps, so if an OEM wants a single app (like, say, the Play Store), it does not have to include every default Google app on its devices.

Android's EU search ballot.
Enlarge / Android’s EU search ballot.

Google

The EU also said that Google can’t restrict OEMs from forking Android. Previously, using the Android codebase in ways Google didn’t approve of would get an OEM kicked out of the Google Play ecosystem. South Korea also took issue with Google’s Android fork restrictions and fined the company $177 million, one of South Korea’s biggest fines ever.

Android’s business model doesn’t charge OEMs directly; instead, it generates revenue for Google through end-user Play Store purchases, Google Search queries, and Google ad impressions. These three areas are such moneymakers that not only can they completely fund Android development, but Google also offers a revenue-share program for Android OEMs, offering incentives like a kickback for each user’s search revenue.

Google’s response to all these changes was to start charging OEMs for Android if they went along with it. In the EU, OEMs can stick with Google’s preferred terms and the old revenue deals, or they can change things up by paying as much as $40 per device and potentially missing out on revenue-sharing deals.

The ACCC’s move isn’t a requirement yet—for now, it’s a potential measure that the regulator will put out for industry consultation in 2022.

Continue Reading

Gadgets

Raspberry Pi Zero 2 W: 5x faster than the original for $5 more

Published

on

Enlarge / The Raspberry Pi Zero 2 W.

The diminutive Raspberry Pi Zero is getting its first upgrade in nearly five years. Today, Raspberry Pi founder Eben Upton announced the Raspberry Pi Zero 2 W, a new $15 product that puts the processor from the Raspberry Pi 3 into a board the exact same size as the original Zero.

The new board swaps the old Zero’s 1 GHz single-core ARM11 processor for a quad-core Cortex A53-based Broadcom BCM2710A1 processor, also clocked at 1 GHz—the same processor used in the original Raspberry Pi 3 released back in 2016, albeit clocked slightly lower. This is a substantial increase in power and capability for the Pi Zero, going from one core to four and from 32 bits to 64.

Upton said that the performance increase over the original Zero “varies across workloads” but that for multithreaded tasks like those simulated by sysbench, “it is almost exactly five times faster.” Heat dissipation is provided by “thick internal copper layers” in the board, which should help prevent thermal throttling without the use of additional fans or heatsinks.

The Pi Zero 2 W should fit most cases and other accessories designed for the original model.
Enlarge / The Pi Zero 2 W should fit most cases and other accessories designed for the original model.

But the Pi Zero 2 W is still a low-powered, miniature version of the Pi, which means there’s just not a lot of physical space for other upgrades. The Zero 2 W still uses 512MB of RAM, 2.4 GHz 802.11n Wi-Fi with Bluetooth 4.2, and a single HDMI port along with two micro-USB ports (one for power, one for data) and a microSD card slot. Because it still uses the same Zero form factor, it should fit all existing cases and accessories made for the original Pi Zero.

Upton said that the company hopes to ship about 200,000 Pi Zero 2 W boards in the remainder of 2021 and an additional 250,000 in the first half of 2022. These numbers are being limited somewhat by ongoing chip shortages, which prompted a rare price increase for the flagship Raspberry Pi 4 model earlier this month.

The original Pi Zero W and the Wi-Fi-less Pi Zero will continue to be manufactured and sold for their original prices of $10 and $5, respectively.

Continue Reading

Trending