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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.
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Arizona Scholarships 2026: $1,500 Awards + Free ACF Virtual Workshops
Arizona scholarships 2026: Arizona scholarships are open through ACF: one application for 160+ awards, plus ARAC’s $1,500 Ashby-Herring scholarships due April 6, 2026.
Last Updated on March 11, 2026 by Daily News Staff
Arizona Scholarships 2026: $1,500 Awards + Free ACF Virtual Workshops
Scholarship season moves fast, and for a lot of Arizona families, the hardest part isn’t writing the essay or gathering transcripts—it’s simply finding the right opportunities in time.
The Archer Ragsdale Arizona Chapter (ARAC), Tuskegee Airmen, Inc. is encouraging students and the community to take advantage of scholarship resources through the Arizona Community Foundation (ACF), including an easy online application that can match applicants with 160+ scholarships—plus virtual workshops where students can get help directly from ACF’s scholarship team.
Whether you’re a high school senior, a current college student, or an adult re-entry student, ACF’s scholarship portal is designed to meet people where they are.
The Big Picture: One Application, 160+ Scholarships
According to the flyer, ACF awarded $6.3 million in scholarships last year, with over 160 scholarships available through a single, easy application.
- Application opens: January 1
- Most deadlines: March and April
- Where to start: https://azfoundation.org/scholarships
- ACF scholarship email: scholarship@azfoundation.org
What to watch for: Even if a student is only targeting one scholarship, completing the ACF application can surface additional matches they didn’t know existed.
ARAC Tuskegee Airmen Scholarship: Ashby-Herring Scholarships ($1,500) — Deadline April 6, 2026
ARAC (Tuskegee Airmen, Inc.) awards two or more scholarships to deserving Arizona students who are college-bound. The flyer highlights the Ashby-Herring scholarships, named in honor of late founding ARAC members who were original Tuskegee Airmen.
Award: Two Ashby-Herring scholarships (each $1,500)
Deadline:April 6, 2026
Apply here:https://www.azfoundation.org/archer-ragsdale
Eligibility:
- Graduating high school senior from Arizona
- Attending a 2-year or 4-year college/university
- African-American
- 3.0 GPA or higher
- Demonstrated financial need
Free Virtual Workshops (Zoom): Get Help With Your Application
If you’ve ever watched a student stall out halfway through an application, these workshops are a smart fix: they’re designed so applicants can work on their scholarship application with support from ACF’s scholarship team.
Workshop dates (Zoom):
- February 12, 2026 — 4:00 to 5:00 p.m.
- March 5, 2026 — 4:00 to 5:00 p.m.
- March 26 — 4:00 to 5:00 p.m. (date listed on flyer; confirm year when registering)
Register here:https://acf.cventevents.com/acfscholarships2026
View the flyer here: https://stmdailynews.com/wp-content/uploads/2026/03/Deadline-updated-12.29.2025-Archer-Ragsdale-Flyer-FINAL.pdf
Download Flyer (PDF)
What to watch for: Register for the dates you can attend and come prepared with what you already have (basic info, activities list, questions). One hour of guided progress can save days of procrastination.
Why This Matters (and Why Sharing Helps)
The Tuskegee Airmen legacy is rooted in excellence, discipline, and breaking barriers—and scholarships tied to that legacy are meant to elevate futures for the next generation.
If you’re a parent, teacher, coach, mentor, or neighbor, consider this your nudge: forward the link, post it in a group chat, or share it with a student who might qualify. Deadlines hit quickly, and the easiest scholarship to win is often the one you actually apply for.
View the press release: https://stmdailynews.com/wp-content/uploads/2026/03/FOR-IMMEDIATE-RELEASE.pdf
Related Links:
- https://azfoundation.org/scholarships
- https://acf.cventevents.com/acfscholarships2026
- https://www.azfoundation.org/archer-ragsdale
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Traveling to Mexico this spring? Here’s what to know about current advisories
Traveling to Mexico this spring? Visitors should be aware of state-specific travel advisories, as safety concerns in one region do not affect major resort areas like Cancun and Los Cabos, currently rated Level 2, which encourages increased caution. Monitoring official updates is essential for informed travel decisions amidst evolving conditions.
Last Updated on March 10, 2026 by Daily News Staff
Traveling to Mexico this spring? Here’s what to know about current advisories
(Tiffany Miller for ALG Vacations) For some travelers counting down to spring break, recent headlines about violence in parts of Mexico have sparked a new question: Should I cancel my trip? Travel advisors say they are seeing a surge in calls and emails from clients trying to determine whether developments in one region affect major resort areas elsewhere.
The questions follow several days of unrest in parts of Mexico after security operations targeting organized crime leaders prompted temporary flight disruptions and shelter-in-place guidance for U.S. government personnel in areas including Puerto Vallarta and Guadalajara. In this article, ALG Vacations explains what current travel advisories mean for spring break travelers heading to Mexico.
The U.S. State Department evaluates Mexico state by state, not as a single destination, and advisory levels vary by region. Many major beach destinations, including Cancun, Riviera Maya, Tulum and Los Cabos, are currently under a Level 2 advisory, which encourages travelers to exercise increased caution. It does not discourage travel.
Part of the confusion stems from geography. Puerto Vallarta, on the Pacific coast, is roughly 1,300 miles from Cancun and the Riviera Maya on the Caribbean side, about the distance between New York and Miami. Because advisories are assigned state by state, developments in one region do not automatically alter another.
In recent days, that uncertainty has translated into additional inquiries about whether specific resort areas are experiencing disruptions. U.S. Embassy security alerts issued this week indicate that temporary shelter-in-place guidance affecting Puerto Vallarta was lifted and that flight operations resumed. The advisory level for the Mexican state of Quintana Roo remains unchanged.
Some clients are asking about alternatives, advisors say, but many are continuing with their plans after reviewing official updates. Travel patterns often shift in response to breaking headlines, they add, before stabilizing as clearer information becomes available.
The State Department assigns travel advisories on a four-tier scale ranging from Level 1, exercise normal precautions, to Level 4, do not travel. While Level 2 encourages increased awareness, Level 3 and Level 4 carry stronger language discouraging or restricting travel.
Advisories are reviewed regularly and can be updated as conditions evolve. The State Department’s Mexico advisory page breaks down conditions by state, reflecting the country’s federal structure rather than issuing a single national designation. Travelers can also enroll in the State Department’s Smart Traveler Enrollment Program, which provides real-time security updates and allows U.S. officials to contact citizens in an emergency.
Embassy notices state that airports, hotels and tourism services in Quintana Roo are operating normally. Security conditions across Mexico vary widely by state, with some regions carrying higher advisories and others designated Level 1. Most destinations popular with U.S. travelers are currently classified as Level 2.
As spring break approaches, advisors say informed decision-making depends on reviewing the advisories assigned to a specific destination and monitoring official updates, rather than reacting to national headlines alone. Travel decisions ultimately depend on individual comfort levels, they add, but advisory levels are assigned regionally and should be evaluated accordingly.
Photo courtesy of Shutterstock
SOURCE:
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Last Updated on March 8, 2026 by Daily News Staff
Jay L. Zagorsky, Boston University
With the Olympic torch extinguished in Paris, all eyes are turning to Los Angeles for the 2028 Olympics.
The host city has promised that the next Summer Games will be “car-free.”
For people who know Los Angeles, this seems overly optimistic. The car remains king in LA, despite growing public transit options.
When LA hosted the Games in 1932, it had an extensive public transportation system, with buses and an extensive network of electric streetcars. Today, the trolleys are long gone; riders say city buses don’t come on schedule, and bus stops are dirty. What happened?
This question fascinates me because I am a business professor who studies why society abandons and then sometimes returns to certain technologies, such as vinyl records, landline phones and metal coins. The demise of electric streetcars in Los Angeles and attempts to bring them back today vividly demonstrate the costs and challenges of such revivals. https://www.youtube.com/embed/9X78ZqGyc5o?wmode=transparent&start=0 The 2028 Olympic Games will be held in existing sports venues around Los Angeles and are expected to host 15,000 athletes and over 1 million spectators.
Riding the Red and Yellow Cars
Transportation is a critical priority in any city, but especially so in Los Angeles, which has been a sprawling metropolis from the start.
In the early 1900s, railroad magnate Henry Huntington, who owned vast tracts of land around LA, started subdividing his holdings into small plots and building homes. In order to attract buyers, he also built a trolley system that whisked residents from outlying areas to jobs and shopping downtown.
By the 1930s, Los Angeles had a vibrant public transportation network, with over 1,000 miles of electric streetcar routes, operated by two companies: Pacific Electric Railway, with its “Red Cars,” and Los Angeles Railway, with its “Yellow Cars.”
The system wasn’t perfect by any means. Many people felt that streetcars were inconvenient and also unhealthy when they were jammed with riders. Moreover, streetcars were slow because they had to share the road with automobiles. As auto usage climbed and roads became congested, travel times increased.
Nonetheless, many Angelenos rode the streetcars – especially during World War II, when gasoline was rationed and automobile plants shifted to producing military vehicles. https://www.youtube.com/embed/AwKv3_WwD4o?wmode=transparent&start=0 In 1910, Los Angeles had a widely used local rail network, with over 1,200 miles (1,930 kilometers) of track. What happened?
Demise of public transit
The end of the war marked the end of the line for streetcars. The war effort had transformed oil, tire and car companies into behemoths, and these industries needed new buyers for goods from the massive factories they had built for military production. Civilians and returning soldiers were tired of rationing and war privations, and they wanted to spend money on goods such as cars.
After years of heavy usage during the war, Los Angeles’ streetcar system needed an expensive capital upgrade. But in the mid-1940s, most of the system was sold to a company called National City Lines, which was partly owned by the carmaker General Motors, the oil companies Standard Oil of California and Phillips Petroleum, and the Firestone tire company.
These powerful forces had no incentive to maintain or improve the old electric streetcar system. National City ripped up tracks and replaced the streetcars with buses that were built by General Motors, used Firestone tires and ran on gasoline.
There is a long-running academic debate over whether self-serving corporate interests purposely killed LA’s streetcar system. Some researchers argue that the system would have died on its own, like many other streetcar networks around the world.
The controversy even spilled over into pop culture in the 1988 movie “Who Framed Roger Rabbit,” which came down firmly on the conspiracy side.
What’s undisputed is that, starting in the mid-1940s, powerful social forces transformed Los Angeles so that commuters had only two choices: drive or take a public bus. As a result, LA became so choked with traffic that it often took hours to cross the city.
In 1990, the Los Angeles Times reported that people were putting refrigerators, desks and televisions in their cars to cope with getting stuck in horrendous traffic. A swath of movies, from “Falling Down” to “Clueless” to “La La Land,” have featured the next-level challenge of driving in LA.
Traffic was also a concern when LA hosted the 1984 Summer Games, but the Games went off smoothly. Organizers convinced over 1 million people to ride buses, and they got many trucks to drive during off-peak hours. The 2028 games, however, will have roughly 50% more athletes competing, which means thousands more coaches, family, friends and spectators. So simply dusting off plans from 40 years ago won’t work.
Olympic transportation plans
Today, Los Angeles is slowly rebuilding a more robust public transportation system. In addition to buses, it now has four light-rail lines – the new name for electric streetcars – and two subways. Many follow the same routes that electric trolleys once traveled. Rebuilding this network is costing the public billions, since the old system was completely dismantled.
Three key improvements are planned for the Olympics. First, LA’s airport terminals will be connected to the rail system. Second, the Los Angeles organizing committee is planning heavily on using buses to move people. It will do this by reassigning some lanes away from cars and making them available for 3,000 more buses, which will be borrowed from other locales.
Finally, there are plans to permanently increase bicycle lanes around the city. However, one major initiative, a bike path along the Los Angeles River, is still under an environmental review that may not be completed by 2028.
Car-free for 17 days
I expect that organizers will pull off a car-free Olympics, simply by making driving and parking conditions so awful during the Games that people are forced to take public transportation to sports venues around the city. After the Games end, however, most of LA is likely to quickly revert to its car-centric ways.
As Casey Wasserman, chair of the LA 2028 organizing committee, recently put it: “The unique thing about Olympic Games is for 17 days you can fix a lot of problems when you can set the rules – for traffic, for fans, for commerce – than you do on a normal day in Los Angeles.”
This article has been updated to indicate that Los Angeles has four light-rail lines.
Jay L. Zagorsky, Associate Professor of Markets, Public Policy and Law, Boston University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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