Tech
New algorithm enhances Doppler resolution of unmanned vehicle radars
A research team has developed an extrapolation-based Doppler resolution enhancement algorithm for frequency modulated continuous wave radars. The algorithm improves system performance, offering an advancement that is superior to existing ultra-high-resolution technologies.
The findings are published in the Journal of Electrical Engineering & Technology. The team was led by Sang-dong Kim and Bong-seok Kim, affiliated with the DGIST Division of Mobility Technology, in collaboration with a team led by Professor Youngdoo Choi, affiliated with the Republic of Korea Naval Academy (ROKNA).
Improving radar accuracy without extra hardware
This research introduces a technology that improves radar detection accuracy without the need for additional complex computations or hardware. The technology is expected to contribute to enhancing radar system performance on various intelligent unmanned platforms such as unmanned aerial vehicles (UAVs), unmanned ships, and autonomous vehicles.
Conventional radar systems analyze the Doppler effect to determine the velocity of a target, but the fast Fourier transform (FFT)-based approach has limitations regarding resolution (i.e., the accuracy of velocity discrimination). To address this, the joint DGIST–ROKNA research team applied a signal extrapolation technique and has proposed a new algorithm that enhances Doppler resolution without extending observation time.
Performance gains and real-world applications
The proposed method successfully reduces the root mean square error of velocity estimation by up to 33% and decreases the target miss rate by up to 68%, representing a substantial improvement over the conventional approach. Notably, the proposed method maintains the same computational complexity level as the conventional FFT method, thereby simultaneously achieving fast processing speed and high efficiency.
This technology can effectively solve the problem of signal overlap between targets moving at similar velocities, particularly when UAVs or radar systems detect multiple objects simultaneously. It can therefore greatly enhance the ability to distinguish closely spaced targets and improve detection accuracy, marking a new milestone in the advancement of high-resolution target detection technology.
Additionally, the technology is highly regarded for its industrial applicability because it requires no additional hardware resources and features a simple computational structure that enables real-time implementation.
Sang-dong Kim, principal researcher at the Division of Mobility Technology (concurrently serving the interdisciplinary engineering major), said, “This study demonstrates an improvement in both the efficiency and precision of radar signal processing, enabling more accurate target detection without the need for additional equipment. It is expected to evolve into a key technology for defense, autonomous driving, and unmanned systems.”
More information:
Youngdoo Choi et al, Doppler Resolution Enhancement Algorithm Based on Extrapolation for FMCW Radar, Journal of Electrical Engineering & Technology (2025). DOI: 10.1007/s42835-025-02453-6
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New algorithm enhances Doppler resolution of unmanned vehicle radars (2025, November 11)
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Tech
In Cryptoland, Memecoin Fever Gives Way to a Stablecoin Boom
When US president Donald Trump launched his own meme cryptocurrency on January 17, days before his return to the White House, I was halfway up a Swiss alp, attending a crypto conference in the town of St. Moritz.
Memecoins, which typically have no purpose beyond financial speculation, were having a moment. The previous year, millions of new memecoins had flooded the market; a few, like Fartcoin, had rocketed to billion-dollar valuations. Pump.Fun, a platform for launching and trading memecoins, had become one of the fastest-growing crypto launchpad businesses ever. Now, the soon-to-be president was getting in on the act.
Over lunch on the second day of the conference, beneath the ornate stucco ceiling and golden chandeliers of the venue’s dining hall, I located a table designated for a conversation about memecoins. Whereas other tables were half full, the memecoin workshop was oversubscribed; latecomers pulled up chairs to create two full rows.
The discussion was led by Nagendra Bharatula, founder of investment firm G-20 Group. Bharatula had recently coauthored a paper arguing that memecoins, despite their juvenile spirit, had a place in professional investors’ portfolios. In the six months prior, a basket of 25 “bluechip memecoins”—an oxymoron if ever there was one—had outperformed bitcoin by 150 percent, he pointed out. Some of the attendees murmured their approval.
Since then, the shine has come off the memecoin market. The paper value of Trump’s coin, which climbed to a peak of $14 billion two days after its launch, has cratered to roughly $1 billion. Hundreds of thousands of small investors lost their shirts. Pump.Fun’s daily revenue, a proxy for the overall appetite for memecoin trading, is barely more than a tenth of what it was in January. The memecoin gold rush has spawned a raft of litigation.
Next up: the stablecoin. If memecoins are symbolic of reckless abandon and unflinching profiteering in cryptoland, stablecoins are a symbol of the industry’s search for purpose and respectability. Designed to hold a steady $1 valuation, stablecoins are pitched by proponents as a faster and cheaper way to make everyday payments and international money transfers.
In a year in which the US has declared itself open for crypto business, where previously crypto firms feared regulatory backlash under the Biden administration, stablecoins have supplanted memecoins as the coin à la mode—and punctured the mainstream.
Though stablecoins have been around since 2014, they have predominantly been used by crypto traders as a safe harbor during bouts of market volatility, not by regular people. The concept has also faced resistance from regulators skeptical of a new form of money; Diem, a stablecoin venture incubated at Meta, famously shuttered in 2022 in the face of broad-based opposition.
Tech
Best HelloFresh Coupons and Promo Codes for December 2025
Leveraging meal kit coupons is the extreme couponing of our times—a capitalism hack-a-thon right up there with trial yoga classes and attempting to cancel your Adobe subscription. Meal kits like HelloFresh have always been a better deal than they get credit for, even at full price: It’s actually hard to recreate meal kit meals for less than you can get the recipes delivered to your home. But it’s especially worth it when you can find a HelloFresh coupon, promo code, or discount at more than half off.
I’ll admit I wasn’t that sold on HelloFresh when I first tried it most of a decade ago. It was useful, it got me out of my staid routines, but I wasn’t impressed with the selection. It felt a little basic. But lately? Honestly, it’s kinda cosmopolitan these days, after expanding to a dozen countries and absorbing the supply networks from multiple other meal plans. When I last tested the HelloFresh meal kit (7/10, WIRED Recommends), I was surprised to find myself cooking credible home renditions of ramen, ponzu-plum beef stir fry, and Southwest-accented pork roasts. And when I’m able to pick up a HelloFresh discount code, it’s generally less than I’d spend on groceries anyway. So it’s a good moment to try out a lifestyle where the food comes in the mail.
Get 50% Off and up to 10 Free Meals as a New HelloFresh Customer
Right now, new and returning customers can take advantage of a HelloFresh discount code offering 50% off your first meal kit box plus a free item each week. Enter your email as part of the signup process, and you’ll be auto-subscribed to an email with even more offers for both new and existing customers. Plus, new customers can get up to 55% off and extra free breakfasts, desserts, and other items with other secret discounts.
HelloFresh Student and Discount: 55% Off, Free Shipping, Plus Extra 15% Off Education Discounts Available via UNiDAYS
HelloFresh meal kits are pretty amenable to dorm life when ordering the ready-to-eat meals—or just saving time during grad school instead of ordering pizza, by letting the Internet do your shopping and meal planning. But student budgets tend to be tight, of course. And so there are steeply discounted HelloFresh coupon codes specifically for students. Follow the link here for a HelloFresh education promo code offering 55% off your first box, free shipping, and a continuing discount of 15% off for the first year.
Discounts also apply to teachers who’ve never tried HelloFresh. Educators and school employees can get up to 12 free meals spread out across 3 boxes, plus free shipping. Click here for the HelloFresh promo code, or go here for more information about educator discounts.
Note that the student and educator discounts don’t combine with any other HelloFresh discounts or promotions.
Special Hero Discount for Military, Veterans, and Healthcare Workers
Military discounts are a long tradition in America. HelloFresh also offers hero discount programs for first responders, health professionals, and military personnel. Heroes also get excellent discounts that include 55% off the first order, free shipping, and 15% off for the first year of HelloFresh delivery boxes.
This program is open to nurses, hospital employees, EMTs, active military, veterans, and first responders. First responders include law enforcement, 911 dispatch, and firefighters. Click here to see if you’re eligible, or follow this link for more information about HelloFresh hero discounts.
Note that the hero discounts don’t combine with any other HelloFresh promo codes.
Give $40, Get $10 With the HelloFresh Referral Program
Already a HelloFresh subscriber? You’re still eligible for discounts if you pass along subscription information to your friends. Here’s how: Send your friends a $40 discount for their own affordable meal kits. Once they sign up using your HelloFresh referral code, you’ll also get a $10 credit on your next delivery.
These discounts stack. So if you sign up multiple friends with your referral code, you get multiple $10 discounts. Check out the HelloFresh meal kit referral program here.
Take Advantage of HelloFresh Come Back Offers
Some of these discounts are only available to new HelloFresh customers. But there’s a hack to getting discounts anyway. After you pause or cancel your subscription, check your inbox after the next few days or weeks. Often, you’ll get HelloFresh coupon codes for discounts.
Typical HelloFresh “come-back” offers after a canceled subscription include: $100 to $180 off (spread out over several meal boxes), free shipping on the first box (after re-subscribing), free items such as dessert, breakfast, or an extra protein per meal, or a free meal box is offered after a break. Typical retention offers, for when customers try to cancel, include: 40% off the next box, if you decide not to cancel, or 25% off the next two meal kits. None of this is failsafe, of course, offers vary for each customer. But as with magazine subscriptions, sometimes canceling, or trying to cancel, will lead to a good discount offer from a company eager to keep your business.
When to Save the Most on HelloFresh Subscriptions
HelloFresh almost always has some sort of deal going, whether to bring in new customers with an especially choice HelloFresh coupon, or bring back previous customers with HelloFresh discount codes and retention offers. But summer tends to be one of the times they offer the steepest discounts, including 10 free meals across several boxes, complimentary appetizers, free ready-made items, or free shipping on select boxes.
The other big times for HelloFresh coupon codes are around Black Friday and the end of the year. HelloFresh often launches limited-edition holiday meal boxes and themed meal kits, not to mention discounts for returning customers looking to cook more at home as part of New Year’s resolutions.
Tech
The Ricoh GR IV, the Cult Favorite Pocket Camera, Just Got Way Better
When I reviewed the GR III, I wrote about how much I liked snap focus mode, which allows you to set a predetermined focus distance regardless of the aperture. I set up my GR III to use autofocus when I half-pressed the shutter and snap when I quickly pressed, so that snap focus fired off the shot at my predetermined focus distance (usually 1.5 meters).
All that remains, but there is also now a dedicated letter, Sn, on the mode dial that sets the camera in Snap Focus mode, which allows you to dial in not only the distance you want focus at, but also the aperture you want to lock in. You can control the depth of field as well. I rather enjoyed this new mode and found myself shooting with it quite a bit.
Should You Get One?
The GR IV debuted at $1,497, which is significantly more than the GR III’s $999 price at launch. Is it worth the extra money? If you have a GR III and are frustrated by the autofocus, I think you will like the upgrade. It’s significant and, if you have the money, well worth it.
If you have any desire to use your pocket camera for video, this is not the one for you. See our guides to pocket cameras and the best travel cameras for some better, hybrid photo- and video-capable cameras. If you want an APS-C sensor that legitimately fits in your pocket, offers amazing one-handed control, and produces excellent images, the the Ricoh GR IV is for you.
Personally, I am holding out for the GR IVx, which will hopefully, like the GR IIIx, be the same camera with a 40mm-equivalent lens. At the time of writing, Ricoh would not comment on whether there will be a GR IVx.
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