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Listening for the right radio signals could be an effective way to track small drones
Unidentified drone sightings near sensitive U.S. locations raise public concern. Challenges exist in tracking these drones, necessitating better detection methods and potential regulatory changes for airspace management.
Iain Boyd, University of Colorado Boulder
The recent spate of unidentified drone sightings in the U.S., including some near sensitive locations such as airports and military installations, has caused significant public concern.
Some of this recent increase in activity may be related to a September 2023 change in U.S. Federal Aviation Administration regulations that now allow drone operators to fly at night. But most of the sightings are likely airplanes or helicopters rather than drones.
The inability of the U.S. government to definitively identify the aircraft in the recent incidents, however, has some people wondering, why can’t they?
I am an engineer who studies defense systems. I see radio frequency sensors as a promising approach to detecting, tracking and identifying drones, not least because drone detectors based on the technology are already available. But I also see challenges to using the detectors to comprehensively spot drones flying over American communities.
How drones are controlled
Operators communicate with drones from a distance using radio frequency signals. Radio frequency signals are widely used in everyday life such as in garage door openers, car key fobs and, of course, radios. Because the radio spectrum is used for so many different purposes, it is carefully regulated by the Federal Communications Commission.
Drone communications are only allowed in narrow bands around specific frequencies such as at 5 gigahertz. Each make and model of a drone uses unique communication protocols coded within the radio frequency signals to interpret instructions from an operator and to send data back to them. In this way, a drone pilot can instruct the drone to execute a flight maneuver, and the drone can inform the pilot where it is and how fast it is flying.
Identifying drones by radio signals
Radio frequency sensors can listen in to the well-known drone frequencies to detect communication protocols that are specific to each particular drone model. In a sense, these radio frequency signals represent a unique fingerprint of each type of drone.
In the best-case scenario, authorities can use the radio frequency signals to determine the drone’s location, range, speed and flight direction. These radio frequency devices are called passive sensors because they simply listen out for and receive signals without taking any active steps. The typical range limit for detecting signals is about 3 miles (4.8 kilometers) from the source.
These sensors do not represent advanced technology, and they are readily available. So, why haven’t authorities made wider use of them? https://www.youtube.com/embed/9yFzdpEqQCs?wmode=transparent&start=0 Drones were all the buzz in the Northeast at the end of 2024.
Challenges to using radio frequency sensors
While the monitoring of radio frequency signals is a promising approach to detecting and identifying drones, there are several challenges to doing so.
First, it’s only possible for a sensor to obtain detailed information on drones that the sensor knows the communication protocols for. Getting sensors that can detect a wide range of drones will require coordination between all drone manufacturers and some central registration entity.
In the absence of information that makes it possible to decode the radio frequency signals, all that can be inferred about a drone is a rough idea of its location and direction. This situation can be improved by deploying multiple sensors and coordinating their information.
Second, the detection approach works best in “quiet” radio frequency environments where there are no buildings, machinery or people. It’s not easy to confidently attribute the unique source of a radio frequency signal in urban settings and other cluttered environments. Radio frequency signals bounce off all solid surfaces, making it difficult to be sure where the original signal came from. Again, the use of multiple sensors around a particular location, and careful placement of those sensors, can help to alleviate this issue.
Third, a major part of the concern over the inability to detect and identify drones is that they may be operated by criminals or terrorists. If drone operators with malicious intent know that an area targeted for a drone operation is being monitored by radio frequency sensors, they may develop effective countermeasures. For example, they may use signal frequencies that lie outside the FCC-regulated parameters, and communication protocols that have not been registered. An even more effective countermeasure is to preprogram the flight path of a drone to completely avoid the use of any radio frequency communications between the operator and the drone.
Finally, widespread deployment of radio frequency sensors for tracking drones would be logistically complicated and financially expensive. There are likely thousands of locations in the U.S. alone that might require protection from hostile drone attacks. The cost of deploying a fully effective drone detection system would be significant.
There are other means of detecting drones, including radar systems and networks of acoustic sensors, which listen for the unique sounds drones generate. But radar systems are relatively expensive, and acoustic drone detection is a new technology.
The way forward
It was almost guaranteed that at some point the problem of unidentified drones would arise. People are operating drones more and more in regions of the airspace that have previously been very sparsely populated.
Perhaps the recent concerns over drone sightings are a wake-up call. The airspace is only going to become much more congested in the coming years as more consumers buy drones, drones are used for more commercial purposes, and air-taxis come into use. There’s only so much that drone detection technologies can do, and it might become necessary for the FAA to tighten regulation of the nation’s airspace by, for example, requiring drone operators to submit detailed flight plans.
In the meantime, don’t be too quick to assume those blinking lights you see in the night sky are drones.
Iain Boyd, Director of the Center for National Security Initiatives and Professor of Aerospace Engineering Sciences, University of Colorado Boulder
This article is republished from The Conversation under a Creative Commons license. Read the original article.
jobs help wanted
Ghost Jobs: The Hidden Hiring Trend Affecting Millions of Job Seekers
Ghost jobs are becoming a growing concern for job seekers. Learn what they are, why companies post them, and how they affect hiring, the economy, and your job search.
Why You Keep Applying—But Never Hear Back
If you’ve ever spent hours tailoring your résumé for a position only to hear nothing in return, you may have encountered what’s known as a ghost job.
A ghost job is a job posting that appears active but isn’t currently being filled. While not every old or inactive listing is intentionally misleading, many remain online long after hiring has paused—or even after the position has already been filled.
The result is growing frustration among job seekers and increasing questions about the accuracy of employment data.
What Exactly Is a Ghost Job?
A ghost job is an advertised position where an employer has little or no immediate intention of hiring someone.
This doesn’t necessarily mean the company is acting maliciously. There are several reasons these listings exist.
Companies may:
- Build a database of future candidates
- Test salary expectations and available talent
- Comply with internal hiring policies
- Maintain the appearance of growth
- Delay removing listings after a hiring freeze or filled position
For applicants, however, the experience is often the same: applications disappear into a black hole.
Why Companies Post Ghost Jobs
Some employers say maintaining job listings helps them prepare for future growth.
Others keep positions open because budgets haven’t been finalized or executive approval hasn’t been granted.
Recruiters may also continue collecting résumés so they’re ready when a position eventually opens.
While these reasons may make business sense, they can create unrealistic expectations for applicants actively searching for work.
The Impact on Job Seekers
Ghost jobs can have real consequences.
Many applicants spend dozens of hours:
- Researching companies
- Customizing résumés
- Writing cover letters
- Completing assessments
- Participating in interviews that never lead anywhere
The emotional toll can be significant.
Repeated silence often leaves qualified workers questioning their experience or abilities when the issue may simply be that the position was never actively available.
How Ghost Jobs Affect the Economy
The effects extend beyond individual applicants.
Employment Data Can Be Misleading
Job openings are often viewed as a sign of economic strength.
If a significant share of posted openings aren’t being actively filled, the labor market may appear stronger than it actually is.
That can influence:
- Business confidence
- Consumer confidence
- Economic forecasts
- Public policy discussions
Productivity Suffers
Job seekers spend valuable time applying for positions that may never result in interviews.
Recruiters also spend time managing applications for jobs that aren’t immediately available.
Those inefficiencies create costs for both workers and employers.
Hiring Becomes Less Efficient
When applicants lose trust in job boards, they’re less likely to apply broadly.
Companies with legitimate openings may receive fewer qualified applicants because candidates become skeptical of online listings.
Are Ghost Jobs Illegal?
Generally, no.
In most cases, employers are legally allowed to advertise positions even if they’re not hiring immediately.
However, critics argue that intentionally leaving inactive jobs online without updating their status reduces transparency and wastes applicants’ time.
Some employment experts have called for greater accountability and clearer labeling of inactive or future hiring opportunities.
How to Spot a Ghost Job
While there’s no foolproof method, these warning signs may indicate a listing isn’t actively being filled:
- The same position has been reposted for months.
- The posting never disappears.
- Employees report hiring freezes.
- The company rarely responds to applicants.
- The job description is vague or unusually generic.
Tips for Job Seekers
Instead of applying blindly:
- Focus on recently posted openings.
- Connect with recruiters or current employees.
- Research whether the company is actually expanding.
- Use networking alongside online applications.
- Follow up professionally when possible.
Quality applications often produce better results than sending hundreds of résumés.
Looking Ahead
Artificial intelligence has made it easier than ever for applicants to submit hundreds of applications—and for employers to post and manage thousands of job listings.
As hiring becomes increasingly automated, transparency may become one of the most valuable qualities in the recruiting process.
For both employers and job seekers, trust remains the foundation of a healthy labor market.
Related Links
- U.S. Bureau of Labor Statistics – Job Openings and Labor Turnover Survey (JOLTS)
- U.S. Bureau of Labor Statistics (BLS)
- Society for Human Resource Management (SHRM)
- Indeed Career Guide
- LinkedIn Talent Blog
- CareerBuilder Advice & Resources
- Monster Career Advice
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Joby Aviation and Toyota kick off manufacturing alliance to scale electric air taxi production
Joby Aviation and Toyota launch a joint venture to improve productivity, quality, and cost as they prepare to scale electric air taxi production.
Joby Aviation and Toyota Motor Corporation have launched the initial phase of a strategic manufacturing alliance aimed at accelerating commercial production of electric air taxis—an early step the companies say is designed to make “air mobility for all” a practical, everyday reality.
Announced June 30, 2026, the partnership formalizes a new joint venture that will combine Joby’s electric aviation development with Toyota’s production systems and operational expertise. The near-term focus: building the groundwork for commercial production while pushing improvements in productivity, quality, and cost—key factors as the industry moves from prototypes to scaled manufacturing.
What the joint venture is designed to do
According to the companies, the alliance will initially concentrate on:
- Establishing the foundation for commercial production capability
- Advancing manufacturing excellence with an emphasis on productivity, quality, and cost
- Supporting expansion of Joby’s production capacity as it works toward aircraft certification and prepares for anticipated demand
The announcement positions Toyota’s manufacturing playbook—known globally for lean production and continuous improvement—as a lever to help Joby move from development into repeatable, high-quality output at scale.
Why it matters: eVTOLs need scale, not just flight tests
Electric vertical take-off and landing (eVTOL) aircraft have become one of the most closely watched bets in next-generation transportation, but the path to viable air taxi services depends on more than successful test flights. Certification timelines, supply chain readiness, and the ability to produce aircraft consistently (and affordably) are often what separates promising technology from commercial reality.
By forming a joint venture focused on manufacturing readiness, Joby and Toyota are signaling that the next competitive frontier is industrialization—how quickly and reliably eVTOL aircraft can be built to meet safety standards and market demand.
Related Links for Further reading
- Joby Aviation (official): https://www.jobyaviation.com
- Joby Investor Relations / News (official updates & filings): https://ir.jobyaviation.com
- Toyota Newsroom (official): https://www.toyotanewsroom.com
- Toyota Global (corporate overview): https://global.toyota/en
- FAA Advanced Air Mobility / Air Taxis (context): https://www.faa.gov/air-taxis
What executives are saying
Joby founder and CEO JoeBen Bevirt emphasized the long-running relationship between the companies, calling the joint venture a reflection of shared confidence in the opportunity ahead.
“Toyota has been by Joby’s side for nearly a decade, providing invaluable guidance and support as we built the foundation for manufacturing our aircraft,” Bevirt said. “Together, we share a vision of making aerial mobility an everyday reality.”
Toyota Motor Corporation Chairman Akio Toyoda framed air mobility as an extension of the company’s broader mission.
“Since our founding, we’ve been guided by the philosophy of providing mobility for all,” Toyoda said, adding that Toyota views air mobility as “a natural extension of that philosophy—from the ground into the sky.”
About the companies
Joby Aviation (NYSE: JOBY) is a California-based transportation company developing an all-electric eVTOL air taxi. The company intends to operate its own air taxi service in cities worldwide and sell aircraft to other operators and partners.
Toyota (NYSE: TM) has operated in North America for nearly 70 years and says it is focused on sustainable, next-generation mobility through Toyota and Lexus brands. Toyota reports nearly 64,000 employees in North America, 14 manufacturing plants, and more than 1,800 dealerships. The company also noted that its North Carolina plant began assembling automotive batteries for electrified vehicles in 2025.
What to watch for next
For readers tracking the air taxi sector, the next milestones will likely center on:
- Details on how the joint venture will be structured operationally
- Updates on Joby’s certification progress and production ramp timelines
- Signs of how manufacturing improvements translate into cost reductions and throughput
- Additional agreements or expanded collaboration as the alliance progresses
While the companies highlighted expected benefits, they also noted the usual forward-looking risks—such as regulatory certification timelines, market conditions, and the ability to finalize additional agreements.
Source: Toyota Motor North America / PRNewswire (June 30, 2026)
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financial wellness
Building Brighter Futures: Helping Young People Succeed in a Changing Economy
Changing Economy: During a time when the economy is changing rapidly and shifting the landscape of work into uncertain territory, academic success is no longer enough to put young people on a stable path to the future. Smart students need to start taking steps in new directions, adding key concepts like financial literacy, economic mobility and entrepreneurship to their knowledge arsenals.
Building Brighter Futures: Helping Young People Succeed in a Changing Economy
(Feature Impact) During a time when the economy is changing rapidly and shifting the landscape of work into uncertain territory, academic success is no longer enough to put young people on a stable path to the future. Once, a high school diploma was enough to land a well-paying job. Then a college degree became the gold standard. Now the roadmap has changed again, which means that smart students need to start taking steps in new directions.
According to Junior Achievement, three key concepts to add to modern teenagers’ knowledge arsenal include financial literacy, economic mobility and entrepreneurship.
Why Financial Literacy Matters
When young people are equipped with the knowledge they need to earn, manage, save and invest money, it supports their journey through every life milestone ahead, from education and homeownership to retirement and more. Financial literacy gives people the confidence to make smart decisions while dodging costly mistakes like getting into high-interest debt.
A recent Junior Achievement survey indicated that although 42% of Americans struggle with money management, 23% feel their income could be sufficient if they understood how to manage it more effectively. Giving students a strong foundation in financial literacy can set them up well to not only earn money but use it wisely to meet their future needs and accomplish their goals.
The Power of Economic Mobility
Economic mobility refers to the idea that each generation can expect to achieve better opportunities and more financial stability than the one before. Today’s youth are growing increasingly skeptical of this possibility, and for good reason: they see that even many college graduates are underemployed and struggling to find their feet.
There’s no denying the game has changed. However, upward economic mobility is still within reach for students who are willing to learn the new rules, especially if they have parents and educators supporting their journeys. With or without a college degree, students who engage with their communities, believe in their own potential and focus on building transferable personal and entrepreneurial skills can find themselves well-positioned to navigate a changing world.
How to Grow Entrepreneurial Skills
Topics like financial literacy and business acumen can be taught in a variety of ways both in and out of the classroom. Other key entrepreneurial skills – like leadership, confidence, work ethic, creativity and critical thinking – are more like muscles that get stronger when they’re trained. While academics are still important, hands-on opportunities and experiences are invaluable parts of the equation to prepare students for economic success.
Take programs like Future Bound by Junior Achievement, for example, which is an immersive annual event designed to empower high school students with essential skills and opportunities to innovate. Participants put their intelligence, creativity and ambition to the test during four team competitions where they can showcase and hone real-world business and economic skills. Winners receive national honors, awards, scholarships and prizes from event sponsors, including Pacific Life Foundation and Staples, among others. Plus, all attendees get the chance to network with industry leaders from around the country, participate in workshops and connect with other future-focused teens.
Whether you’re a student, parent, educator or volunteer, explore more resources to help young people succeed at JA.org.
Photo courtesy of Shutterstock
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