No sooner did the drone (UAS) market take off than the counter-drone or C-UAS (Counter-UAS) market got off the ground, as well. After all, something had to be done about those pesky rascals, right? For as long as there have been drones, there have been people wanting to shoot them down. That is actually what the first drones were made for – to be shot down, by ‘air defense artillery’ (ADA), when used for gunnery practice.
Today’s C-UAS techniques range from quite sophisticated (and expensive) to very simple. They give an (imaginary) alternative to the angry farmer with a shotgun. They provide a means for law enforcement to disable or destroy unlawful drones. They provide a series of techniques for the integrated monitoring and defense of the national airspace (NAS) and of strategic national assets and infrastructure.
While not directly targeting drones, the FAA (Federal Aviation Administration) looks to be one of the biggest players in the counter-UAS world…well, in the counter recreational UAS world, at least. The restrictive rules they propose for Remote ID and Tracking of drones may be more effective in clearing the skies than an army of farmers with shotguns (or a fistful of fancy C-UAS technology).
To stay on track, I’ll focus on emerging anti-drone (or counter-UAS) technologies and providers, though.
The fourth C-UAS USA conference will be held in March, in Washington, D.C. The cost for the three-day event is $599 for government, police, and military. The rest of us get to pay $1,695. I guess I won’t be attending. Below is a copy of their advertisement:
Counter UAS Winter – Agenda

The World’s leading Counter UAS Summit is back for it’s fourth information packed iteration! Just one year ago, we were just starting to explore what Counter UAS really involved by focusing on CUAS challenges & solutions for both military and domestic agencies. One year later we have become the global go to summit that tackles a wide variety of CUAS topics ranging from protecting airports, drone swarms, directed energy weapons, EW systems, S&T challenges and counter terrorism.
This March 29-April 2, 2020 in Washington, D.C we will take an even closer view on how to integrate the latest technology designed to combat emerging drone threats, while working towards improving the regulatory issues facing all sectors.
Topics Covered Include:
* Military’s Counter-UAS acquisition goals
* Countering drone swarms
* Defending against autonomous UAS
* C-UAS requirements
* Protecting critical infrastructure
* Using APS to fight UAS
* Soft kill and hard kill technologies
* Use of UAS by terrorist groups
* Military’s Counter-UAS requirements
* Mounted C-UAS weapon systems
That’s all well and good for the government types with a huge budget, but what about John Q. and Jane Q. Public, who merely want to stop those pesky FPV (First-Person View) racers from zipping around the neighborhood? Well, the first place I checked was Amazon, searching for counter-drone. I mostly found drones…and hidden spy camera detectors.
While Amazon may not be selling anti-drone stuff, they have received a patent for ‘countermeasures’ to protect their ‘Prime Air’ drone delivery systems. None of it seems to be new technology, but the integration of various COTS (commercial off-the-shelf) equipment may be enough.
The system is based on both a ‘mesh’ network and inter-drone communication, using data sharing “to confirm or cross-check data such as location, heading, altitude, and so forth”, to detect data differences and signs of a drone being ‘compromised’.
“Disagreement between data generated by the first UAV with external data from the second UAV may result in the determination that the first UAV is compromised,” is how the patent application explains it.
Here’s a figure of the system, from the 2014 patent application:

The communication system proposes encrypted FHSS (Frequency-Hopping Spread Spectrum) to secure the data-links. In the event of a compromise, the UAV can perform an automatic RTH (Return to Home) or avoid by landing (apparently wherever the ‘jamming’ is encountered). That should be interesting.
In addition to the anti-jamming capabilities, Amazon claims to have a sophisticated ‘detect-and-avoid’ mechanism (which begs the question of why remote ID and tracking is needed for recreational UAS). I am assuming that the remote ID would come into play when Amazon reports recreational UAS (RUAS) which interfere with their important socks and doodad-delivery operations (and thus require those sophisticated detect-and-avoid capabilities).
But this isn’t really counter-UAS…just Amazon protecting their drones. I wanted to find more direct counter-drone technologies. I found some, but most aren’t in the average anti-drone citizen’s budget (According to a 2019 study by Sandia National Laboratories, out of 123 C-UAS products for which pricing information was available, 77 cost more than $100,000). Below are a few of the more common systems:
DroneShield (an Australian company) makes a drone gun which emits a jamming signal (range up to 1.5 miles) which will interfere with the C2 (command and control) signal between the offending UAV and its remote controller.
Lockheed-Martin ain’t messing with tiny guns. They propose a bigger solution: Athena (Advanced Test High Energy Asset). The tower-mounted laser system fires from 30-120KW (kilo-watts) at offending drones, knocking them right out of the sky (and maybe onto grandma’s head).
Delft Dynamics (a Netherlands firm) proposes a less overt strategy: their Drone Catcher is a counter-UAV drone, which tracks offending drones and catches them in a net (in order to preserve evidence/images and prevent things from falling on grandma’s head).
The SkyWall 100 uses a shoulder-fired weapon which sends a drone-catching net, which then descends via parachute. Grandma might like this idea.
With ‘all the’ (like, three) incidents of people trying to smuggle some weed to their poor imprisoned buddies, it was just a matter of time until someone made something like Sky Fence. It is effectively a series of detectors and jammers which spoof the C2 signals and command an RTH (Return to Home), simultaneously reporting where ‘home’ is (so the cops can be waiting when the drone comes back with the package undelivered.
Let’s not forget the old ‘eagle attack’ scenario, where eagles (or other raptors) are trained to hunt down drones. That didn’t work out so well, so that particular technology has been put back in its nest for now.
If old-fashioned physical attacks are too retro for you, then Maldrone software provides a way to spoof the C2 signals of a drone and then steal it. The misuse potential for this is high…but then, hey, how are you gonna afford a Remote ID-capable Mavic 7 Pro? Well, just steal one…assuming the software is cheaper than the drone.
Most of the technologies I looked at were categorized loosely into a few groups and sub-groups
Detection
Radio receivers to detect C2 links between UAS and remote controllers
Radar systems
Audio sensors (to listen for UAS motor/propeller noise)
Optical sensors (to ID in-flight UAS)
Counter-Measures
Jammers (which send signals to interrupt the UAS’ C2 link)
Spoofers (to send false position data, emulating a GNSS navigation system)
Hackers (which try to take control of the UAS’ C2 link)
Sonic
UAS Attack
Lasers (typically LED)
EMP (Electro-Magnetic Pulse)
High-energy microwave (using a continuous wave-CW signal as opposed to EMP’s momentary burst)
UAS Capture
Net-deployment
Attack birds (raptors)
Note the two general categories appear to be A) detection and B) counter-measures of some type.
A report from the Center for the Study of the Drone at Bard College provides some good data on available C-UAS technology. Bard researchers found 537 systems for sale – hundreds more than they found in the previous year’s study. Three hundred and seventy five of these products are billed for intercepting and disabling UAS, while the rest detect them.
Find the report here: https://dronecenter.bard.edu/projects/counter-drone-systems-project/counter-drone-systems-2nd-edition/
To summarize some of the statistics presented:
Of the 375 C-UAS systems found, the ‘majority’ (unspecified) are designed for ground-based use: 260 fixed or stationary, 55 mobile, and 59 undefined.
106 are handheld, and 36 mounted on-board a UAS
12 use a combination of fixed ground-based elements and portable (e.g., handheld) devices
323 C-UAS systems are capable of detection
190 of those use a single sensor, and 130 use a combination of sensors
42 use a combination of three or more sensor types
RF (159) and radar (147) are the most common detection elements
EO (113) and IR (111) systems (typically used together)
Acoustic sensors; 34
Of the 362 systems using ‘interdiction’ methods, 147 use a single method, 215 a combination
Jamming (both RF and GNSS); 259 systems use some form of jamming
31 spoofing systems, 18 laser-based, 27 employ nets, 8 use ‘suicide drones’
Well, as we can see, there are a burgeoning number of ‘solutions’ to counter UAS activities, but they are primarily aimed at and developed for large (e.g., governmental) organizations. As far as the angry homeowner who doesn’t want drones flying over the swimming pool while his daughters are playing, or for the angry farmer who doesn’t like drones flying over his cattle and scaring them…well, it’s a tough old world out there.
As much as anti-drone citizens may like to combat drones using these techniques and technologies, the simple fact is…they can’t. For one thing, it is illegal (in a number of ways) to send jamming signals or interfere with aircraft in operation (a felony in many cases). A great paper on just what these laws are and their effect can be found at one of my main ‘go-to guys’ as far as drone law; (Johnathin) Rupprecht Law Firm (apologies if the name I gave is not totally correct). Here’s a link to his great paper:
Still, how many angry farmers or dads even know of these laws? How many think it is their God-given right to take ‘them pesky drones’ out of the skies? How many will try it first (using whatever means are at hand), and worry about legal consequences later? The answers to those questions may be problematic, at best.
Okay, well citizens can’t (legally) shoot your Mavic Mini out of the sky, or jam and spoof your Autel EVO. How about the cops or other authorities? Well, per law, there are only four organizations in the U.S. who are allowed to take C-UAS actions (up to and including the use of ‘reasonable force’)
-The Department of Justice (DoJ)
-The Department of Energy (DoE)
-The Department of Defense (DoD)
-The Department of Homeland Security (DHS)
That leaves the other law enforcement agencies, well, sort of out of luck – for now. We can expect some laws to change in the near future, allowing local police agencies to take at least limited C-UAS measures. Yet even the non-destructive measures have considerations. For example, if a police officer used a system to ‘spoof’ or ‘hack’ your C2 signal and take control of your drone, that officer would legally then become the RPIC (Remote Pilot in Charge) and thus be required to have an FCC Part 107 certification to fly the drone (even if you are not required to be Part 107 certified).
The waters will surely become even murkier, before they get clearer…
Well, what does all this mean to the common, recreational drone flier? To the drone racer? You’ll still be liable to meet angry people, who will try to swat your drone out of the skies (or take it or the controller from your hands) – if you fly places where angry, aggressive people are likely to be found. If you’re flying out in the country, it might be just you and the angry farmer. Either way, anti-droners are likely to use sticks, towels, rocks, whatever they can get their hands on, if they are angry enough. If they can’t get sophisticated equipment, they will use less sophisticated equipment.
That angry neighbor may not have an electronic drone jammer, but an automatic paintball gun may do just as much damage, if deployed effectively during launch or landing operations. In the end, all the laws in the world won’t change that. The best counter C-UAS (CCUAS) method is to not fly in a way or place which might result in being jammed or shot at.
Even if the angry neighbor doesn’t attack you or your UAS, he or she has available a free application on their phone which will (if close enough and held at the right angle) theoretically identify your UAS. That’s right now this application is out. Once the Remote ID and Tracking rules the FAA proposed become law, the hit-or-miss capability of the current applications will be replaced by a sure-fire identification.
Now, the angry neighbor won’t see your name, home address or other PII (Personally Identifiable Information), as the FAA calls it. But what they will (eventually) see is a Unique UAS ID (UUID) or at least a session ID to which the UUID can be correlated (for UAS duly registered and Remote ID capable). This can be reported to law enforcement (along with pictures of you and/or your drone), who can then match a name and address with your UUID. Bingo! Evidence! That might be better than a big stick or radio jammer, anyway (at least if they are patient enough to wait for that whole process to happen).
As to law enforcement, they may not be able to shoot you down or capture your drone (at the current moment), but they can certainly use the Remote ID capability to get location coordinates (and directions) to not only the location of the UAS, but also to the location of the remote controller (and the person manipulating the controls (the PIC, Pilot in Charge), who is legally responsible for all actions or inactions of the UAS while in flight. *
*That is, for all compliant UAS. Unregistered or non-compliant UAS would not be easily identified, but that is a relatively easy matter to address: the FAA merely demands that DJI (and all other major manufacturers of Ready to Fly (RTF) drones) force a firmware upgrade to all non-compliant UAS, disabling them from flight. Your controller will simply never establish a link with the UAS. Once the UAS has been upgraded to RID (Remote ID) capability (for a cost, at least to an authorized USS-UAS Service Supplier) it will (potentially) be able to fly again.
At least, that is the scheme proposed to the FAA by DJI (the major recreational/commercial UAS manufacturer). The FAA chose an alternate (and more costly) scheme. If the existing DJI receiver/controller functionality can be upgraded by firmware, that option will still exist. If this capability is not possible under the new RID rules, then the non-compliant UAS would be ‘geo-fenced’ out of existence, with unlocking only available for FAA-designated drone parks (FAA-Recognized Identification Area or FRIA).
If you’re crazy enough to be flying around any military areas or power plants, then they can and will stop your drone. If you’re breaking the law, the police can at least identify and locate you. If you’re on the lam from the Feds, they can shoot you down (or at least use ‘reasonable force’).
So, for the recreational and lawful flier, the whole C-UAS counter-drone world is relatively irrelevant. That stuff is for use against terrorists and criminals. If you somehow fly your home-made (and non-compliant) FPV racer, the authorities will consider your unidentified drone to be either a terrorist or a criminal. And that’s where C-UAS technologies come into play.
In addition to your drone being destroyed or disabled (and legally confiscated), you are likely to face some serious ‘splainin’ to the officials and quite likely end up facing federal, state, and local charges. That’s a high price to pay for some nighttime FPV zooming through downtown, or some rural barnstorming. Whether C-UAS and the penalties will be a real deterrent to rebel fliers remains to be seen.
I’ll be keeping an eye on developments, and write more about this subject as matters develop. Until then, I guess I’ll fly safe and sane, and be glad none of the stuff I mentioned above will be used against me.
Keep on flyin’, and see you in the next post!

















