News
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.
Last Updated on May 16, 2026 by Daily News Staff
National Small Business Month
Every May, communities across the United States recognize Small Business Month, a time dedicated to celebrating the entrepreneurs, family-owned companies, startups, and local shops that help drive the American economy. From neighborhood restaurants to innovative tech startups, small businesses continue to play a vital role in creating jobs, supporting communities, and inspiring innovation.
According to the U.S. Small Business Administration, small businesses account for millions of jobs nationwide and represent the backbone of local economies. Throughout May, organizations, chambers of commerce, and business leaders host networking events, educational workshops, and promotional campaigns to support entrepreneurs and encourage consumers to shop locally.
One of the highlights of the month is National Small Business Week, which honors outstanding entrepreneurs and business owners making a difference in their communities.
For consumers, Small Business Month is also a reminder that supporting local businesses helps strengthen neighborhoods and keeps communities thriving. Whether it’s dining at a local café, shopping at an independent store, or hiring a local service provider, every purchase can make an impact.
Learn more about Small Business Month and related events through the official U.S. Small Business Administrationwebsite.
Related External Links
- U.S. Small Business Administration (SBA)
- National Small Business Week – SBA
- SCORE – Mentoring and Resources for Small Businesses
- U.S. Chamber of Commerce – Small Business Resources
- Forbes Small Business News and Insights
Our Lifestyle section on STM Daily News is a hub of inspiration and practical information, offering a range of articles that touch on various aspects of daily life. From tips on family finances to guides for maintaining health and wellness, we strive to empower our readers with knowledge and resources to enhance their lifestyles. Whether you’re seeking outdoor activity ideas, fashion trends, or travel recommendations, our lifestyle section has got you covered. Visit us today at https://stmdailynews.com/category/lifestyle/ and embark on a journey of discovery and self-improvement.
News Brief
Earthquake Swarm Shakes Southern California Near Salton Sea
Earthquake Swarm: A swarm of earthquakes near California’s Salton Sea and Brawley area has prompted increased monitoring by seismologists as hundreds of tremors shake the region.
A swarm of earthquakes has been rattling Southern California near the Salton Sea, drawing attention from residents and seismologists across the region.
Salton Sea earthquake swarm?
The activity is centered near Brawley in Imperial County, an area known for frequent seismic movement due to its location within the Brawley Seismic Zone. According to the U.S. Geological Survey, hundreds of small earthquakes have been recorded over the past several days, with the strongest reaching a magnitude of approximately 4.7.
Residents throughout Imperial Valley, parts of Riverside County, and even portions of Arizona reported feeling shaking from several of the larger quakes. Minor incidents such as falling objects and brief power disruptions were also reported, though no major injuries or widespread structural damage have been confirmed at this time.
The region sits near the southern end of the San Andreas Fault and is considered one of California’s most geologically active areas. Scientists say earthquake swarms are relatively common near the Salton Sea because of the interaction between tectonic fault systems and geothermal activity beneath the surface.
While experts continue to monitor the situation closely, they emphasize that earthquake swarms do not necessarily indicate that a larger earthquake is imminent. However, officials encourage residents to review emergency preparedness plans, secure heavy furniture, and keep emergency supplies ready.
The Salton Sea region has experienced similar seismic swarms in the past, making it an important area of study for earthquake researchers and emergency management agencies.
For continued updates on this developing story and other regional news, visit STM Daily News.
Related External Links
- U.S. Geological Survey (USGS) – Earthquake Monitoring
- California Institute of Technology (Caltech)
- California Earthquake Preparedness Guide
- Ready.gov – Earthquake Safety Tips
- USGS – Salton Trough and Seismic Activity
Stay informed with the latest breaking news, trending stories, and real-time updates from around the world on STM Daily News. Visit our Stories This Moment page for continuously updated coverage on major events, technology, transportation, science, entertainment, and more.
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Consumer Corner
Frustration at the Pump: Why Americans are Exploring Electric Vehicles
Exploring Electric Vehicles: For more than one-third of Americans, one simple number is leading them to research electric vehicles: the final tally at a recent gas station fill-up. The pump is no longer just the close of a sale; for a growing number of drivers, it’s where questions begin.
Frustration at the Pump: Why Americans are Exploring Electric Vehicles
(Feature Impact) For more than one-third of Americans, one simple number is leading them to research electric vehicles: the final tally at a recent gas station fill-up.
This, according to new research from Hyundai Motor America, isn’t a hypothetical situation. In fact, 23% of respondents reported it’s happened to them more than once. For nearly half of Americans, pulling up to the pump now brings frustration or outright dread.
Many drivers have a number in mind where the math begins shifting, and once the shift happens, it rarely goes away. The pump is no longer just the close of a sale; for a growing number of drivers, it’s where questions begin.
For 23% of those surveyed, $5 per gallon is where they would start considering alternatives to a gas-powered vehicle. While some say they wouldn’t consider alternatives based on gas costs at all, this meaningful share of Americans points toward a specific tipping point.
Some begin by comparing models or brands while others find themselves on an automaker’s website, further along in the process than they initially expected to be. Most don’t act on this impulse right away, but drivers are increasingly caught somewhere between curious and committed – and 46% of those surveyed said they’d be likely to seriously research an EV.
The desire to leave the pump behind, which an EV would allow for, is a deal nearly half of respondents said they would take. However, the transition isn’t frictionless as charging access and range anxiety remain the top concerns for 28% of potential buyers.
While the move toward electric vehicles is often framed as a long-term decision made with spreadsheets and financial planning, for many Americans, it’s beginning somewhere smaller: a routine fuel stop and an eye-opening receipt.
If you’ve found yourself dismayed at the pump, find more information on electric vehicles at HyundaiUSA.com.
Photo courtesy of Shutterstock
eSOURCE:
Hyundai
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