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