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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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The Long Track Back
Why Downtown Los Angeles Feels Small Compared to Other Cities
Downtown Los Angeles often feels “small” compared to other U.S. cities, but that’s only part of the story. With some of the tallest buildings west of the Mississippi and skyline clusters spread across the region, LA’s downtown reflects the city’s unique polycentric identity—one that, if combined, could form a true mega downtown.
Last Updated on February 18, 2026 by Daily News Staff
Panorama of Los Angeles from Mount Hollywood – California, United States
When people think of major American cities, they often imagine a bustling, concentrated downtown core filled with skyscrapers. New York has Manhattan, Chicago has the Loop, San Francisco has its Financial District. Los Angeles, by contrast, often leaves visitors surprised: “Is this really downtown?”
The answer is yes—and no.
Downtown LA in Context
Compared to other major cities, Downtown Los Angeles (DTLA) is relatively small as a central business district. For much of the 20th century, strict height restrictions capped most buildings under 150 feet, while cities like Chicago and New York were erecting early skyscrapers. LA’s skyline didn’t really begin to climb until the late 1960s.
But history alone doesn’t explain why DTLA feels different. The real story lies in how Los Angeles grew: not as one unified city center, but as a collection of many hubs.
Downtown Los Angeles
A Polycentric City
Los Angeles is famously decentralized. Hollywood developed around the film industry. Century City rose on former studio land as a business hub. Burbank became a studio and aerospace center. Long Beach grew around the port. The Wilshire Corridor filled with office towers and condos.
Unlike other cities where downtown is the place for work, culture, and finance, Los Angeles spread its energy outward. Freeways and car culture made it easy for businesses and residents to operate outside of downtown. The result is a polycentric metropolis, with multiple “downtowns” rather than one dominant core.
A Resident’s Perspective
As someone who lived in Los Angeles for 28 years, I see DTLA differently. While some outsiders describe it as “small,” the reality is that Downtown Los Angeles is still significant. It has some of the tallest buildings west of the Mississippi River, including the Wilshire Grand Center and the U.S. Bank Tower. Over the last two decades, adaptive reuse projects have transformed old office buildings into lofts, while developments like LA Live, Crypto.com Arena, and the Broad Museum have revitalized the area.
In other words, DTLA is large enough—it just plays a different role than downtowns in other American cities.
View of Westwood, Century City, Beverly Hills, and the Wilshire Corridor.
The “Mega Downtown” That Isn’t
A friend once put it to me with a bit of imagination: “If you could magically pick up all of LA’s skyline clusters—Downtown, Century City, Hollywood, the Wilshire Corridor—and drop them together in one spot, you’d have a mega downtown.”
He’s right. Los Angeles doesn’t lack tall buildings or urban energy—it just spreads them out over a vast area, reflecting the city’s unique history, geography, and culture.
A Downtown That Fits Its City
So, is Downtown LA “small”? Compared to Manhattan or Chicago’s Loop, yes. But judged on its own terms, DTLA is a vibrant hub within a much larger, decentralized metropolis. It’s a downtown that reflects Los Angeles itself: sprawling, diverse, and impossible to fit neatly into the mold of other American cities.
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Century City: From Hollywood Backlot to Business Hub
Century City, originally part of 20th Century Fox’s backlot, transformed into a prominent business district in Los Angeles during the 1950s amid the decline of cinema. Developer William Zeckendorf envisioned a mixed-use urban center, leading to iconic skyscrapers and establishing the area as a hub for law, finance, and media, blending Hollywood history with modern business.
Before Century City became one of Los Angeles’ premier business districts, it was part of 20th Century Fox’s sprawling backlot, used for filming movies and housing studio operations. By the 1950s, as television rose and movie attendance declined, 20th Century Fox faced financial challenges and decided to sell a portion of its land.
Developer William Zeckendorf envisioned a “city within a city”—a modern, mixed-use urban center with office towers, hotels, and entertainment facilities. Branded Century City, the name paid homage to its studio roots while symbolizing LA’s vision for the future.
The first skyscrapers, including the Gateway West Building, set the tone for the district’s sleek, futuristic skyline. Architects like Welton Becket and Minoru Yamasaki helped shape Century City’s iconic look. Over time, it evolved from Hollywood’s backlot to a corporate and legal hub, attracting law firms, financial institutions, and media companies.
Today, Century City stands as a testament to Los Angeles’ postwar optimism, westward expansion, and multi-centered urban growth—a unique blend of Hollywood history and modern business.
Related STM Daily News Links:
- The Evolution of Los Angeles Public Transportation
- Why Los Angeles Grew Into a Sprawling City
- Downtown Los Angeles: Past, Present, and Future
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
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Local governments provide proof that polarization is not inevitable
Local politics help mitigate national polarization by focusing on concrete issues like infrastructure and community needs rather than divisive symbolic debates. A survey indicates that local officials experience less partisanship, as interpersonal connections foster recognition of shared interests. This suggests that reducing polarization is possible through collaboration and changes in election laws.
Lauren Hall, Rochester Institute of Technology
When it comes to national politics, Americans are fiercely divided across a range of issues, including gun control, election security and vaccines. It’s not new for Republicans and Democrats to be at odds over issues, but things have reached a point where even the idea of compromising appears to be anathema, making it more difficult to solve thorny problems.
But things are much less heated at the local level. A survey of more than 1,400 local officials by the Carnegie Corporation and CivicPulse found that local governments are “largely insulated from the harshest effects of polarization.” Communities with fewer than 50,000 residents proved especially resilient to partisan dysfunction.
Why this difference? As a political scientist, I believe that lessons from the local level not only open a window onto how polarization works but also the dynamics and tools that can help reduce it.
Problems are more concrete
Local governments deal with concrete issues – sometimes literally, when it comes to paving roads and fixing potholes. In general, cities and counties handle day-to-day functions, such as garbage pickup, running schools and enforcing zoning rules. Addressing tangible needs keeps local leaders’ attention fixed on specific problems that call out for specific solutions, not lengthy ideological debates.
By contrast, a lot of national political conflict in the U.S. involves symbolic issues, such as debates about identity and values on topics such as race, abortion and transgender rights. These battles are often divisive, even more so than purely ideological disagreements, because they can activate tribal differences and prove more resistant to compromise.
Such arguments at the national level, or on social media, can lead to wildly inaccurate stereotypes about people with opposing views. Today’s partisans often perceive their opponents as far more extreme than they actually are, or they may stereotype them – imagining that all Republicans are wealthy, evangelical culture warriors, for instance, or conversely being convinced that all Democrats are radical urban activists. In terms of ideology, the median members of both parties, in fact, look similar.
These kinds of misperceptions can fuel hostility.
Local officials, however, live among the human beings they represent, whose complexity defies caricature. Living and interacting in the same communities leads to greater recognition of shared interests and values, according to the Carnegie/CivicPulse survey.
Meaningful interaction with others, including partisans of the opposing party, reduces prejudice about them. Local government provides a natural space where identities overlap.
People are complicated
In national U.S. politics today, large groups of individuals are divided not only by party but a variety of other factors, including race, religion, geography and social networks. When these differences align with ideology, political disagreement can feel like an existential threat.
Such differences are not always as pronounced at the local level. A neighbor who disagrees about property taxes could be the coach of your child’s soccer team. Your fellow school board member might share your concerns about curriculum but vote differently in presidential elections.
These cross-cutting connections remind us that political opponents are not a monolithic enemy but complex individuals. When people discover they have commonalities outside of politics with others holding opposing views, polarization can decrease significantly.
Finally, most local elections are technically nonpartisan. Keeping party labels off ballots allows voters to judge candidates as individuals and not merely as Republicans or Democrats.
National implications
None of this means local politics are utopian.
Like water, polarization tends to run downhill, from the national level to local contests, particularly in major cities where candidates for mayor and other office are more likely to run as partisans. Local governments also see culture war debates, notably in the area of public school instruction.
Nevertheless, the relative partisan calm of local governance suggests that polarization is not inevitable. It emerges from specific conditions that can be altered.
Polarization might be reduced by creating more opportunities for cross-partisan collaboration around concrete problems. Philanthropists and even states might invest in local journalism that covers pragmatic governance rather than partisan conflict. More cities and counties could adopt changes in election law that would de-emphasize party labels where they add little information for voters.
Aside from structural changes, individual Americans can strive to recognize that their neighbors are not the cardboard cutouts they might imagine when thinking about “the other side.” Instead, Americans can recognize that even political opponents are navigating similar landscapes of community, personal challenges and time constraints, with often similar desires to see their roads paved and their children well educated.
The conditions shaping our interactions matter enormously. If conditions change, perhaps less partisan rancor will be the result.
Lauren Hall, Associate professor of Political Science, Rochester Institute of Technology
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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