GREET Anti Drone Defence Jammer Systems

        GREET Anti Drone Defence Jammer Systems

1. INTRODUCTION

GREET detects both rotary and fixed wing UAVs which communicates on 400, 800, 900,
1200, 2400 and 5800 GHz ISM bands from a distance of minimum 1500 m. up to 8000 m.
and neutralizes them by jamming on these ISM and GNSS frequency (GPS, GLONASS,
GALILEO, BEIDOU) bands. Additionally, GREET allows the operators to create their own
jamming frequency profiles.

Drones are controlled by remote controllers or they can flight by auto-pilot by using GPS
coordinates. While on flight, they transmit video and/or telemetry data to the user to be
controlled accurately. Otherwise, it is not possible to reach the right target especially which are
far away from the flight start point. A real signaling between a drone and remote controller of
it is shown in Figure 2.

GREET follows both video and/or telemetry data signals emitted by drones and remote
control signals on the frequency bands of 400 MHz, 800 MHz, 900 MHz, 1200 MHz, 2400
MHz and 5800 MHz.
There are two different modes for GREET, auto and manual. On auto mode, GREET detects
the threats from all the directions and neutralizes them without an operator and records all the
process. Briefly, GREET is a no need operator system on auto mode. On manual mode, after
detecting the threats and their directions, it warns the operator and wait for the command from
operator to neutralize the threat. Additionally, by its user friendly interface, it allows the
operator to jam on all the frequencies one-by-one.

GREET offers the option to the operator to spoof on GPS bands to mislead the drones which
uses the GPS coordinates during flight with remote control or auto-pilot. Actually, by
spoofing on GPS, GREET
to a critical infrastructure. When GPS Spoofing of GREET is on, all the drones are directed to
the safe zone, sea, which is shown in Figure 3.

GREET detects the threats on all the directions by its omnidirectional antennas and provides a
full coverage protection against swarm drone attacks in which the drones come from different
directions. Additionally, it can be used with directional antennas to detect the threats from a
specific direction and this comes with an extended detection and neutralization range.
Figure 4. User-Friendly Interface of GREET

G R E E T

GREET raises the awareness of the operator about the direction of the drone remote controller
operating on 400, 800, 900 MHz ISM bands by detecting the direction of both the remote
controllers and the drones which transfers the video or telemetry data on 1200, 2400 and 5800
MHz frequency bands. More frequency bands can be added for detection upon customer
request.

GREET can be controlled over Ethernet. Additionally, it can send all the logs and
process records to an operation center over cellular communication systems.
Neutralization range of jamming systems depends on the distance between the threat and the
remote controller of it in line-of-sight. GREET guarantees to neutralize the threat from a
distance of two times of the distance between the threat and the remote controller of it, briefly
at a ratio of 2:1, minimally and 5:1 typically.
Figure 5. Neutralization Ratio of GREET

1. GREET Remote Controller

GREET can be used as a stationary device. And through its ergonomic design and light
weight, can also be used as a backpack device while its turned on.
By the way, GREET requires no installation, it is a one-button operation device.
Table 1. Capabilities of GREET
Turkey Defence Aviation Technology
CAPABILITIES OF GREET
GREET Drone Detection and Neutralization System Technical Specs:
Detection
Frequency Bands
840 870 MHz
1080 1280 MHz
2400 2483.5 MHz
Detection Range
(With Omnidirectional Antennas)
Jamming
Frequency Bands
840 870 MHz
902 928 MHz
GSP L1, L2, L5
GLONASS G1, G2, G3
GALILEO E1, E5a, E5b
BEIDOU B1l, E5b
RF Output Power 70 W (Typically)
Jamming Ratio Min. 2:1 (GREET to Drone : Drone to Remote Control)
Typically 5:1 (GREET to Drone : Drone to Remote
Control)
Antennas Omnidirectional
Power Supply Li-Ion or 220 VAC
Battery Life 24 Hours (Nonstop Detection)
2 Hours (Nonstop Jamming)
Operating
Temperature
Table 2. Technical Specs of GREET

2. COMPARISON OF DETECTION SYSTEMS

There are several solutions to detect the drones, like radars, cameras, acoustic sensors etc. Each
of them has some advantages and disadvantages.

2.1.Radar

Radars, which are designed t o detect d rones, a re d erived f rom ground surveillance r adars.
Hence ground s urveillance r adars are designed t o detect, track and classify t he t hreats o n
ground, their - rived to detect the
altitude o f 517 meters m aximum from a d istance of 2 k m. to threat. It also m eans t hat, t he
detection altitude is getting lower and lower as the distance of threat getting closer. It is shown
on Figure 6 below.
No Detected
517 Meters
Detection Section
2000 Meters
Figure 6. Detection Section of Radars
Additionally, because of the very small RCS (Radar Cross Section) of threats, radars have high
false alarm rates, especially from far away distances.

2.2.Cameras

Thermal cameras are mostly used to detect the drones both on day and night. Unfortunately, the
detection range of them are up to 1000 meters. Additionally, especially in warm climate
territories, false alarm rate of thermal cameras increase because of high temperature. More on,
maintenance of outdoor cameras is difficult to handle, such as the lenses are need to be spotless
on all time to not to increase the false alarm rate.

2.3.Acoustic Sensors

Because the high acoustic noise floor, the detection range of acoustic sensors is about 500
meters and they are appropriate to use near field detection in rural areas.

2.4.RF Sensors

Because all drones transmit video and telemetry data to the user and are guided by remote
controllers, RF sensors are widely used to detect them. Hence the output RF power used to
transmit video and/or telemetry data is regulated to around +20 dBm, drones have the capability
to communicate from a distance up to 8 km. Because drones use omnidirectional antennas to
transmit RF signal to all directions, RF sensors can detect the drone signals even if they are at
the opposite side to remote controllers of drones. In addition, as well as RF sensors detect drones
from farther, they can also detect the threats from high altitudes in contrast to radars.

2.5.Comparison Table

There is a comparison table that shows the advantages and disadvantages of drone detection
systems briefly.
Horizontal
Detection
Range
Vertical
Detection
Range
False Alarm
Rate
Maintanance
Radar
Up to 3000
meters but in
practical, it is
about 2000
meters
Up to 750
meters but it
lowers while the
distance is
getting closer
Increases with
the distance
and small RCS
Easy
Camera Up to 1000
meters
Up to 1000
meters
Increases with
the temperature
Difficult
Acoustic
Sensor
Up to 500
meters
Up to 500
meters
Low Easy
RF Sensor Up to 8000
meters
Up to 2000
meters
Low Easy
Table 3. Comparison of Drone Detection Systems

3. JAMMERS AS DRONE NEUTRALIZATION SYSTEM

Jammers are the most effective drone defeating system for today. There are some other
solutions like catching nets, birdshot cartridges, laser weapons etc. but the non of them can
defeat the threats as far as jammer. In addition, because the drones are very fast, to take sight
on a moving drone is too difficult. So, for today, it seems jamming is the only solution to defeat
the drones.

Performance of a jammer is measured on the neutralization ratio, not the distance. While
jammers are trying to neutralize the threat, they are trying to block the signals on the receiver
of drone which are sourced from remote controller. It means that, if the drone is too close to the
remote controller and too far to the jammer, the blocking signals of jammer are too weak in
contrast to remote controller signals. As drone getting closer to jammer and move away from
remote controller, remote controller signals are getting weak and blocking signals of jammer
are getting stronger. When the jammer signals are stronger to drone receiver than remote
controller signals, the threat is defeated.

In conclusion, ratio between distances of jammer to drone and drone to remote controller is the
performance criteria of drone neutralization systems.

4. INFRASTRUCTURE AND INSTALLATION

Network and electricity infrastructure details will be cleared after site survey.

5. PROPOSAL

System solution is going to be proposed after site survey.