GNSS Anti-Jamming Technology

Find GNSS Anti-Jamming Technology manufacturers and suppliers of anti-jam GPS antennas for military, defense and aerospace applications.
Overview GNSS Anti-Jamming Technology
By Dr Thomas Withington Last updated: December 4th, 2024

GNSS anti-jamming devices perform an important role in mitigating the intentional and unintentional interference of Global Navigation Satellite Systems signals, providing mission-critical defense systems with continuous, assured access to GNSS position, navigation and timing information.

GNSS anti jamming technology for defense (image: Infinidome)

Anti-Jam Technology for Defense

GNSS satellite signals, such as GPS, are crucial for a wide range of military systems, providing position, navigation and timing (PNT) for infantry, armored vehicles, naval vessels, UAVs (unmanned aerial vehicles) and more.

GNSS Interference Locator and Detector

GILD – GNSS Interference Locator and Detector

By the time they reach the GNSS receivers in equipment and vehicles, the power level of these signals is relatively weak, making them susceptible to interference sources that can cause jamming or spoofing.

GNSS jamming is caused by interference on the GNSS signal frequencies that overpowers the satellite signals, and may be done deliberately or occur unintentionally as a result of faulty electronic equipment or electromagnetic radiation from space. Spoofing uses fake GNSS signals to overcome the legitimate satellite transmissions and make the receiver think it is somewhere other than its true location.

GNSS Anti-Jamming Technology

Anti-jamming technology includes the use of special GNSS receivers that use filtering and signal processing to reject unwanted signals, which is especially effective for out-of-band interference. GNSS anti-jamming receivers may also be able to detect jamming signals by measuring signal strength – these signals may be higher-powered than the weak legitimate GNSS signals.

anti jamming gps antenna

Hexagon | NovAtel GAJT-710ML GPS Anti-Jam Antenna

Anti-jam antennas can also be installed that can figure out the direction of the jamming signal and introduce “nulls” that decrease the effectiveness of the jammers.

An adaptive antenna array made up of CRPAs (controlled reception pattern antennas) can be used to mitigate a wide range of interference, even at frequencies that are very close to legitimate GNSS signals.

GNSS Anti-Spoofing

gnss-anti-jamming-module

Infinidome GPSdome 1 Anti-Jamming Module

GNSS anti-spoofing measures include the use of authentication technology such as Galileo’s OSNMA (Open Service Navigation Message Authentication), which uses secure cryptography to check and ensure the authenticity of navigation data. Military GPS users also have access to Y-code, which is broadcast on the L1 and L2 frequencies and uses a constantly changing encrypted binary code to fool spoofing attempts.

Products (5)

GAJT-710ML GPS Anti-Jam Antenna

GPS Anti-Jam Technology

GPS Anti-Jam Technology
NovAtel's GPS Anti-Jam Technology (GAJT®) is available, commercial off-the-shelf (COTS), in... ...710ML provides anti-jam performance comparable to much larger systems, but at a significantly lower...
GAJT-710MS Anti-Jam Antenna

GNSS anti-jam protection for ships and boats

GNSS anti-jam protection for ships and boats
... of additional anti-jamming protection... Jamming and interference, whether intentional or unintentional, can seriously degrade GPS position,...
GAJT®-410MS Anti-jam Antenna for Marine

High performance PNT protection for Naval and Marine Applications

High performance PNT protection for Naval and Marine Applications
Jamming and interference in marine environments are growing worldwide threats for both civilian and... ... interference, jamming and spoofing through dynamic protection on M-Code signals as well as GPS L1...
GAJT-410ML Anti-Jam Antenna

The next evolution of NovAtel’s battle-proven anti-jam technology

The next evolution of NovAtel’s battle-proven anti-jam technology
Jamming and interference, whether intentional or unintentional, can seriously degrade GPS position,...
GAJT®-AE-N Anti-jam antenna electronics

GPS Anti-Jam Technology (GAJT®) Antenna electronics for smaller platforms.

GPS Anti-Jam Technology (GAJT®) Antenna electronics for smaller platforms.
Jamming and interference, whether intentional or unintentional, can seriously degrade GPS position,... ...ng significant anti-jam protection even in dynamic multi-jammer scenarios. The output of the...

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