Jammers are designed to disrupt a drone by blasting electromagnetic noise at radio frequencies that drones operate and transmit video at, and at a power level high enough to drown out any effective communication between the drone and its pilot.
This is known as RF-jamming and this method does not interfere with manned aircraft, cell phones, public broadcasts, or other dedicated radio bands.
When a drone is hit with a jammer’s signal, the drone usually returns back to its origin point (unless GPS is also jammed), giving the jammer user the option to track the drone back to the pilot.
Sometimes the drones might even perform a vertical descent and land on the spot intact. Landing on the spot is also the general response from drones when both RF and GPS are jammed at the same time.
Jammers can be effective against drones over several kilometres away.
While jammers are generally restricted for use in many countries except by the military, police, and first responders depending on the laws, non-GPS jammers are legal in a number of countries.
It is important to look into the laws and regulations of the country and state that you are in to determine whether the use of a drone jammer is legal before operating one.
Perhaps one of the most obvious ways to stop a drone threat is to shoot them down.
This type of system was deployed at the Winter Olympics in South Korea in 2018, and has been used by police in Tokyo for the last three years.
But such net-capture guns are more useful if used in conjunction with other detection technologies.
Security firms have also found a way of using interceptor drones that can lock onto a target, release a net and disable it in mid-air.
The system has many commercial and defence applications, for example prisons, airports and places of interest, however, there are limitations.
Motion-based methods, for instance, can have difficulties distinguishing between drones and birds, while visual detection is dependent on the line of sight.
Lasers are another way of fighting back against a drone attack. Both the US and China have experimented with technology that can shoot down a device within seconds of locating it.
One method comprises a high-energy beam that locates and disables small drones from several miles away. This technology apparently uses infrared cameras that can work in low-visibility conditions, such as fog.
During 2018, China demonstrated a laser gun called the Silent Hunter, which can intercept drones with 'high accuracy'.
A more natural solution has been developed in The Netherlands - with police using trained eagles to bring down hostile drones.
The birds do this by latching on to the propellers with their talons, instantly disabling them.
Trainers say that the eagles see the UAVs as prey, so are not interested in attacking anything else when released. However, there have been issues, with reports that the eagles wouldn’t always do what they were trained to do.